PowerPC specific sub-directories

src/ppc/code-stubs-ppc.cc

 // Copyright 2012 the V8 project authors. All rights reserved.

[danno, 2014/10/20 08:28:43]

Here and elsewhere, please change the year to 2014

[andrew_low, 2014/11/07 18:03:17]

Done.

 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
-#if V8_TARGET_ARCH_ARM
+#if V8_TARGET_ARCH_PPC
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
 #include "src/ic/handler-compiler.h"
 #include "src/ic/ic.h"
 #include "src/isolate.h"
 #include "src/jsregexp.h"
 #include "src/regexp-macro-assembler.h"
-#include "src/runtime.h"
+#include "src/runtime/runtime.h"
 
 namespace v8 {
 namespace internal {
 
 
 static void InitializeArrayConstructorDescriptor(
     Isolate* isolate, CodeStubDescriptor* descriptor,
     int constant_stack_parameter_count) {
-  Address deopt_handler = Runtime::FunctionForId(
-      Runtime::kArrayConstructor)->entry;
+  Address deopt_handler =
+      Runtime::FunctionForId(Runtime::kArrayConstructor)->entry;
 
   if (constant_stack_parameter_count == 0) {
     descriptor->Initialize(deopt_handler, constant_stack_parameter_count,
                            JS_FUNCTION_STUB_MODE);
   } else {
-    descriptor->Initialize(r0, deopt_handler, constant_stack_parameter_count,
+    descriptor->Initialize(r3, deopt_handler, constant_stack_parameter_count,
                            JS_FUNCTION_STUB_MODE, PASS_ARGUMENTS);
   }
 }
 
 
 static void InitializeInternalArrayConstructorDescriptor(
     Isolate* isolate, CodeStubDescriptor* descriptor,
     int constant_stack_parameter_count) {
-  Address deopt_handler = Runtime::FunctionForId(
-      Runtime::kInternalArrayConstructor)->entry;
+  Address deopt_handler =
+      Runtime::FunctionForId(Runtime::kInternalArrayConstructor)->entry;
 
   if (constant_stack_parameter_count == 0) {
     descriptor->Initialize(deopt_handler, constant_stack_parameter_count,
                            JS_FUNCTION_STUB_MODE);
   } else {
-    descriptor->Initialize(r0, deopt_handler, constant_stack_parameter_count,
+    descriptor->Initialize(r3, deopt_handler, constant_stack_parameter_count,
                            JS_FUNCTION_STUB_MODE, PASS_ARGUMENTS);
   }
 }
 
 
 void ArrayNoArgumentConstructorStub::InitializeDescriptor(
     CodeStubDescriptor* descriptor) {
   InitializeArrayConstructorDescriptor(isolate(), descriptor, 0);
 }
 
@@ skipping 24 matching lines @@
 
 void InternalArrayNArgumentsConstructorStub::InitializeDescriptor(
     CodeStubDescriptor* descriptor) {
   InitializeInternalArrayConstructorDescriptor(isolate(), descriptor, -1);
 }
 
 
 #define __ ACCESS_MASM(masm)
 
 
-static void EmitIdenticalObjectComparison(MacroAssembler* masm,
-                                          Label* slow,
+static void EmitIdenticalObjectComparison(MacroAssembler* masm, Label* slow,
                                           Condition cond);
-static void EmitSmiNonsmiComparison(MacroAssembler* masm,
-                                    Register lhs,
-                                    Register rhs,
-                                    Label* lhs_not_nan,
-                                    Label* slow,
-                                    bool strict);
-static void EmitStrictTwoHeapObjectCompare(MacroAssembler* masm,
-                                           Register lhs,
+static void EmitSmiNonsmiComparison(MacroAssembler* masm, Register lhs,
+                                    Register rhs, Label* lhs_not_nan,
+                                    Label* slow, bool strict);
+static void EmitStrictTwoHeapObjectCompare(MacroAssembler* masm, Register lhs,
                                            Register rhs);
 
 
 void HydrogenCodeStub::GenerateLightweightMiss(MacroAssembler* masm,
                                                ExternalReference miss) {
   // Update the static counter each time a new code stub is generated.
   isolate()->counters()->code_stubs()->Increment();
 
   CallInterfaceDescriptor descriptor = GetCallInterfaceDescriptor();
   int param_count = descriptor.GetEnvironmentParameterCount();
   {
     // Call the runtime system in a fresh internal frame.
     FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
     DCHECK(param_count == 0 ||
-           r0.is(descriptor.GetEnvironmentParameterRegister(param_count - 1)));
+           r3.is(descriptor.GetEnvironmentParameterRegister(param_count - 1)));
     // Push arguments
     for (int i = 0; i < param_count; ++i) {
       __ push(descriptor.GetEnvironmentParameterRegister(i));
     }
     __ CallExternalReference(miss, param_count);
   }
 
   __ Ret();
 }
 
 
 void DoubleToIStub::Generate(MacroAssembler* masm) {
-  Label out_of_range, only_low, negate, done;
+  Label out_of_range, only_low, negate, done, fastpath_done;
   Register input_reg = source();
   Register result_reg = destination();
   DCHECK(is_truncating());
 
   int double_offset = offset();
-  // Account for saved regs if input is sp.
-  if (input_reg.is(sp)) double_offset += 3 * kPointerSize;
 
+  // Immediate values for this stub fit in instructions, so it's safe to use ip.
   Register scratch = GetRegisterThatIsNotOneOf(input_reg, result_reg);
   Register scratch_low =
       GetRegisterThatIsNotOneOf(input_reg, result_reg, scratch);
   Register scratch_high =
       GetRegisterThatIsNotOneOf(input_reg, result_reg, scratch, scratch_low);
-  LowDwVfpRegister double_scratch = kScratchDoubleReg;
+  DoubleRegister double_scratch = kScratchDoubleReg;
 
-  __ Push(scratch_high, scratch_low, scratch);
+  __ push(scratch);
+  // Account for saved regs if input is sp.
+  if (input_reg.is(sp)) double_offset += kPointerSize;
 
   if (!skip_fastpath()) {
     // Load double input.
-    __ vldr(double_scratch, MemOperand(input_reg, double_offset));
-    __ vmov(scratch_low, scratch_high, double_scratch);
+    __ lfd(double_scratch, MemOperand(input_reg, double_offset));
 
     // Do fast-path convert from double to int.
-    __ vcvt_s32_f64(double_scratch.low(), double_scratch);
-    __ vmov(result_reg, double_scratch.low());
+    __ ConvertDoubleToInt64(double_scratch,
+#if !V8_TARGET_ARCH_PPC64
+                            scratch,
+#endif
+                            result_reg, d0);
 
-    // If result is not saturated (0x7fffffff or 0x80000000), we are done.
-    __ sub(scratch, result_reg, Operand(1));
-    __ cmp(scratch, Operand(0x7ffffffe));
-    __ b(lt, &done);
-  } else {
-    // We've already done MacroAssembler::TryFastTruncatedDoubleToILoad, so we
-    // know exponent > 31, so we can skip the vcvt_s32_f64 which will saturate.
-    if (double_offset == 0) {
-      __ ldm(ia, input_reg, scratch_low.bit() | scratch_high.bit());
-    } else {
-      __ ldr(scratch_low, MemOperand(input_reg, double_offset));
-      __ ldr(scratch_high, MemOperand(input_reg, double_offset + kIntSize));
-    }
+// Test for overflow
+#if V8_TARGET_ARCH_PPC64

[danno, 2014/10/20 08:28:43]

Here and elsewhere where possible, can you turn this into a 
if (V8_TARGET_ARCH_PPC) instead? This makes more code compile on both platforms
and reduces the number of #ifdefs.

[andrew_low, 2014/11/07 18:03:17]

I understand the request, but this seems to be a style that would be unique to
PowerPC (specifically the src/ppc and src/ic/ppc directories). I don't see any
usage of this pattern in the other platform directories.

This would probably result in 250-300 change areas (1000+ lines of code change)
- I'm fine with doing it if that is what it takes, but I really don't see much
benefit. 

+    __ TestIfInt32(result_reg, scratch, r0);
+#else
+    __ TestIfInt32(scratch, result_reg, r0);
+#endif
+    __ beq(&fastpath_done);
   }
 
-  __ Ubfx(scratch, scratch_high,
-         HeapNumber::kExponentShift, HeapNumber::kExponentBits);
+  __ Push(scratch_high, scratch_low);
+  // Account for saved regs if input is sp.
+  if (input_reg.is(sp)) double_offset += 2 * kPointerSize;
+
+  __ lwz(scratch_high,
+         MemOperand(input_reg, double_offset + Register::kExponentOffset));
+  __ lwz(scratch_low,
+         MemOperand(input_reg, double_offset + Register::kMantissaOffset));
+
+  __ ExtractBitMask(scratch, scratch_high, HeapNumber::kExponentMask);
   // Load scratch with exponent - 1. This is faster than loading
-  // with exponent because Bias + 1 = 1024 which is an *ARM* immediate value.
+  // with exponent because Bias + 1 = 1024 which is a *PPC* immediate value.
   STATIC_ASSERT(HeapNumber::kExponentBias + 1 == 1024);
-  __ sub(scratch, scratch, Operand(HeapNumber::kExponentBias + 1));
+  __ subi(scratch, scratch, Operand(HeapNumber::kExponentBias + 1));
   // If exponent is greater than or equal to 84, the 32 less significant
   // bits are 0s (2^84 = 1, 52 significant bits, 32 uncoded bits),
   // the result is 0.
   // Compare exponent with 84 (compare exponent - 1 with 83).
-  __ cmp(scratch, Operand(83));
-  __ b(ge, &out_of_range);
+  __ cmpi(scratch, Operand(83));
+  __ bge(&out_of_range);
 
   // If we reach this code, 31 <= exponent <= 83.
   // So, we don't have to handle cases where 0 <= exponent <= 20 for
   // which we would need to shift right the high part of the mantissa.
   // Scratch contains exponent - 1.
   // Load scratch with 52 - exponent (load with 51 - (exponent - 1)).
-  __ rsb(scratch, scratch, Operand(51), SetCC);
-  __ b(ls, &only_low);
+  __ subfic(scratch, scratch, Operand(51));
+  __ cmpi(scratch, Operand::Zero());
+  __ ble(&only_low);
   // 21 <= exponent <= 51, shift scratch_low and scratch_high
   // to generate the result.
-  __ mov(scratch_low, Operand(scratch_low, LSR, scratch));
+  __ srw(scratch_low, scratch_low, scratch);
   // Scratch contains: 52 - exponent.
   // We needs: exponent - 20.
   // So we use: 32 - scratch = 32 - 52 + exponent = exponent - 20.
-  __ rsb(scratch, scratch, Operand(32));
-  __ Ubfx(result_reg, scratch_high,
-          0, HeapNumber::kMantissaBitsInTopWord);
+  __ subfic(scratch, scratch, Operand(32));
+  __ ExtractBitMask(result_reg, scratch_high, HeapNumber::kMantissaMask);
   // Set the implicit 1 before the mantissa part in scratch_high.
-  __ orr(result_reg, result_reg,
-         Operand(1 << HeapNumber::kMantissaBitsInTopWord));
-  __ orr(result_reg, scratch_low, Operand(result_reg, LSL, scratch));
+  STATIC_ASSERT(HeapNumber::kMantissaBitsInTopWord >= 16);
+  __ oris(result_reg, result_reg,
+          Operand(1 << ((HeapNumber::kMantissaBitsInTopWord) - 16)));
+  __ slw(r0, result_reg, scratch);
+  __ orx(result_reg, scratch_low, r0);
   __ b(&negate);
 
   __ bind(&out_of_range);
   __ mov(result_reg, Operand::Zero());
   __ b(&done);
 
   __ bind(&only_low);
   // 52 <= exponent <= 83, shift only scratch_low.
   // On entry, scratch contains: 52 - exponent.
-  __ rsb(scratch, scratch, Operand::Zero());
-  __ mov(result_reg, Operand(scratch_low, LSL, scratch));
+  __ neg(scratch, scratch);
+  __ slw(result_reg, scratch_low, scratch);
 
   __ bind(&negate);
   // If input was positive, scratch_high ASR 31 equals 0 and
   // scratch_high LSR 31 equals zero.
   // New result = (result eor 0) + 0 = result.
   // If the input was negative, we have to negate the result.
   // Input_high ASR 31 equals 0xffffffff and scratch_high LSR 31 equals 1.
   // New result = (result eor 0xffffffff) + 1 = 0 - result.
-  __ eor(result_reg, result_reg, Operand(scratch_high, ASR, 31));
-  __ add(result_reg, result_reg, Operand(scratch_high, LSR, 31));
+  __ srawi(r0, scratch_high, 31);
+#if V8_TARGET_ARCH_PPC64
+  __ srdi(r0, r0, Operand(32));
+#endif
+  __ xor_(result_reg, result_reg, r0);
+  __ srwi(r0, scratch_high, Operand(31));
+  __ add(result_reg, result_reg, r0);
 
   __ bind(&done);
+  __ Pop(scratch_high, scratch_low);
 
-  __ Pop(scratch_high, scratch_low, scratch);
+  __ bind(&fastpath_done);
+  __ pop(scratch);
+
   __ Ret();
 }
 
 
+#if 0   // more unused code, kept for easy compare to ARM
 void WriteInt32ToHeapNumberStub::GenerateFixedRegStubsAheadOfTime(
     Isolate* isolate) {
   WriteInt32ToHeapNumberStub stub1(isolate, r1, r0, r2);
   WriteInt32ToHeapNumberStub stub2(isolate, r2, r0, r3);
   stub1.GetCode();
   stub2.GetCode();
 }
 
 
 // See comment for class.
@@ skipping 33 matching lines @@
   // a double because it uses a sign bit instead of using two's complement.
   // The actual mantissa bits stored are all 0 because the implicit most
   // significant 1 bit is not stored.
   non_smi_exponent += 1 << HeapNumber::kExponentShift;
   __ mov(ip, Operand(HeapNumber::kSignMask | non_smi_exponent));
   __ str(ip, FieldMemOperand(the_heap_number(), HeapNumber::kExponentOffset));
   __ mov(ip, Operand::Zero());
   __ str(ip, FieldMemOperand(the_heap_number(), HeapNumber::kMantissaOffset));
   __ Ret();
 }
-
+#endif  // roohack

[danno, 2014/10/20 08:28:43]

Do you still want the block above in the code?

[andrew_low, 2014/11/07 18:03:17]

No, removed.

 
 // Handle the case where the lhs and rhs are the same object.
 // Equality is almost reflexive (everything but NaN), so this is a test
 // for "identity and not NaN".
-static void EmitIdenticalObjectComparison(MacroAssembler* masm,
-                                          Label* slow,
+static void EmitIdenticalObjectComparison(MacroAssembler* masm, Label* slow,
                                           Condition cond) {
   Label not_identical;
   Label heap_number, return_equal;
-  __ cmp(r0, r1);
-  __ b(ne, &not_identical);
+  __ cmp(r3, r4);
+  __ bne(&not_identical);
 
   // Test for NaN. Sadly, we can't just compare to Factory::nan_value(),
   // so we do the second best thing - test it ourselves.
   // They are both equal and they are not both Smis so both of them are not
   // Smis.  If it's not a heap number, then return equal.
   if (cond == lt || cond == gt) {
-    __ CompareObjectType(r0, r4, r4, FIRST_SPEC_OBJECT_TYPE);
-    __ b(ge, slow);
+    __ CompareObjectType(r3, r7, r7, FIRST_SPEC_OBJECT_TYPE);
+    __ bge(slow);
   } else {
-    __ CompareObjectType(r0, r4, r4, HEAP_NUMBER_TYPE);
-    __ b(eq, &heap_number);
+    __ CompareObjectType(r3, r7, r7, HEAP_NUMBER_TYPE);
+    __ beq(&heap_number);
     // Comparing JS objects with <=, >= is complicated.
     if (cond != eq) {
-      __ cmp(r4, Operand(FIRST_SPEC_OBJECT_TYPE));
-      __ b(ge, slow);
+      __ cmpi(r7, Operand(FIRST_SPEC_OBJECT_TYPE));
+      __ bge(slow);
       // Normally here we fall through to return_equal, but undefined is
       // special: (undefined == undefined) == true, but
       // (undefined <= undefined) == false!  See ECMAScript 11.8.5.
       if (cond == le || cond == ge) {
-        __ cmp(r4, Operand(ODDBALL_TYPE));
-        __ b(ne, &return_equal);
-        __ LoadRoot(r2, Heap::kUndefinedValueRootIndex);
-        __ cmp(r0, r2);
-        __ b(ne, &return_equal);
+        __ cmpi(r7, Operand(ODDBALL_TYPE));
+        __ bne(&return_equal);
+        __ LoadRoot(r5, Heap::kUndefinedValueRootIndex);
+        __ cmp(r3, r5);
+        __ bne(&return_equal);
         if (cond == le) {
           // undefined <= undefined should fail.
-          __ mov(r0, Operand(GREATER));
-        } else  {
+          __ li(r3, Operand(GREATER));
+        } else {
           // undefined >= undefined should fail.
-          __ mov(r0, Operand(LESS));
+          __ li(r3, Operand(LESS));
         }
         __ Ret();
       }
     }
   }
 
   __ bind(&return_equal);
   if (cond == lt) {
-    __ mov(r0, Operand(GREATER));  // Things aren't less than themselves.
+    __ li(r3, Operand(GREATER));  // Things aren't less than themselves.
   } else if (cond == gt) {
-    __ mov(r0, Operand(LESS));     // Things aren't greater than themselves.
+    __ li(r3, Operand(LESS));  // Things aren't greater than themselves.
   } else {
-    __ mov(r0, Operand(EQUAL));    // Things are <=, >=, ==, === themselves.
+    __ li(r3, Operand(EQUAL));  // Things are <=, >=, ==, === themselves.
   }
   __ Ret();
 
   // For less and greater we don't have to check for NaN since the result of
   // x < x is false regardless.  For the others here is some code to check
   // for NaN.
   if (cond != lt && cond != gt) {
     __ bind(&heap_number);
     // It is a heap number, so return non-equal if it's NaN and equal if it's
     // not NaN.
 
     // The representation of NaN values has all exponent bits (52..62) set,
     // and not all mantissa bits (0..51) clear.
     // Read top bits of double representation (second word of value).
-    __ ldr(r2, FieldMemOperand(r0, HeapNumber::kExponentOffset));
+    __ lwz(r5, FieldMemOperand(r3, HeapNumber::kExponentOffset));
     // Test that exponent bits are all set.
-    __ Sbfx(r3, r2, HeapNumber::kExponentShift, HeapNumber::kExponentBits);
-    // NaNs have all-one exponents so they sign extend to -1.
-    __ cmp(r3, Operand(-1));
-    __ b(ne, &return_equal);
+    STATIC_ASSERT(HeapNumber::kExponentMask == 0x7ff00000u);
+    __ ExtractBitMask(r6, r5, HeapNumber::kExponentMask);
+    __ cmpli(r6, Operand(0x7ff));
+    __ bne(&return_equal);
 
     // Shift out flag and all exponent bits, retaining only mantissa.
-    __ mov(r2, Operand(r2, LSL, HeapNumber::kNonMantissaBitsInTopWord));
+    __ slwi(r5, r5, Operand(HeapNumber::kNonMantissaBitsInTopWord));
     // Or with all low-bits of mantissa.
-    __ ldr(r3, FieldMemOperand(r0, HeapNumber::kMantissaOffset));
-    __ orr(r0, r3, Operand(r2), SetCC);
-    // For equal we already have the right value in r0:  Return zero (equal)
+    __ lwz(r6, FieldMemOperand(r3, HeapNumber::kMantissaOffset));
+    __ orx(r3, r6, r5);
+    __ cmpi(r3, Operand::Zero());
+    // For equal we already have the right value in r3:  Return zero (equal)
     // if all bits in mantissa are zero (it's an Infinity) and non-zero if
     // not (it's a NaN).  For <= and >= we need to load r0 with the failing
     // value if it's a NaN.
     if (cond != eq) {
+      Label not_equal;
+      __ bne(&not_equal);
       // All-zero means Infinity means equal.
-      __ Ret(eq);
+      __ Ret();
+      __ bind(&not_equal);
       if (cond == le) {
-        __ mov(r0, Operand(GREATER));  // NaN <= NaN should fail.
+        __ li(r3, Operand(GREATER));  // NaN <= NaN should fail.
       } else {
-        __ mov(r0, Operand(LESS));     // NaN >= NaN should fail.
+        __ li(r3, Operand(LESS));  // NaN >= NaN should fail.
       }
     }
     __ Ret();
   }
   // No fall through here.
 
   __ bind(&not_identical);
 }
 
 
 // See comment at call site.
-static void EmitSmiNonsmiComparison(MacroAssembler* masm,
-                                    Register lhs,
-                                    Register rhs,
-                                    Label* lhs_not_nan,
-                                    Label* slow,
-                                    bool strict) {
-  DCHECK((lhs.is(r0) && rhs.is(r1)) ||
-         (lhs.is(r1) && rhs.is(r0)));
+static void EmitSmiNonsmiComparison(MacroAssembler* masm, Register lhs,
+                                    Register rhs, Label* lhs_not_nan,
+                                    Label* slow, bool strict) {
+  DCHECK((lhs.is(r3) && rhs.is(r4)) || (lhs.is(r4) && rhs.is(r3)));
 
   Label rhs_is_smi;
   __ JumpIfSmi(rhs, &rhs_is_smi);
 
   // Lhs is a Smi.  Check whether the rhs is a heap number.
-  __ CompareObjectType(rhs, r4, r4, HEAP_NUMBER_TYPE);
+  __ CompareObjectType(rhs, r6, r7, HEAP_NUMBER_TYPE);
   if (strict) {
     // If rhs is not a number and lhs is a Smi then strict equality cannot
     // succeed.  Return non-equal
-    // If rhs is r0 then there is already a non zero value in it.
-    if (!rhs.is(r0)) {
-      __ mov(r0, Operand(NOT_EQUAL), LeaveCC, ne);
+    // If rhs is r3 then there is already a non zero value in it.
+    Label skip;
+    __ beq(&skip);
+    if (!rhs.is(r3)) {
+      __ mov(r3, Operand(NOT_EQUAL));
     }
-    __ Ret(ne);
+    __ Ret();
+    __ bind(&skip);
   } else {
     // Smi compared non-strictly with a non-Smi non-heap-number.  Call
     // the runtime.
-    __ b(ne, slow);
+    __ bne(slow);
   }
 
   // Lhs is a smi, rhs is a number.
   // Convert lhs to a double in d7.
   __ SmiToDouble(d7, lhs);
-  // Load the double from rhs, tagged HeapNumber r0, to d6.
-  __ vldr(d6, rhs, HeapNumber::kValueOffset - kHeapObjectTag);
+  // Load the double from rhs, tagged HeapNumber r3, to d6.
+  __ lfd(d6, FieldMemOperand(rhs, HeapNumber::kValueOffset));
 
   // We now have both loaded as doubles but we can skip the lhs nan check
   // since it's a smi.
-  __ jmp(lhs_not_nan);
+  __ b(lhs_not_nan);
 
   __ bind(&rhs_is_smi);
   // Rhs is a smi.  Check whether the non-smi lhs is a heap number.
-  __ CompareObjectType(lhs, r4, r4, HEAP_NUMBER_TYPE);
+  __ CompareObjectType(lhs, r7, r7, HEAP_NUMBER_TYPE);
   if (strict) {
     // If lhs is not a number and rhs is a smi then strict equality cannot
     // succeed.  Return non-equal.
-    // If lhs is r0 then there is already a non zero value in it.
-    if (!lhs.is(r0)) {
-      __ mov(r0, Operand(NOT_EQUAL), LeaveCC, ne);
+    // If lhs is r3 then there is already a non zero value in it.
+    Label skip;
+    __ beq(&skip);
+    if (!lhs.is(r3)) {
+      __ mov(r3, Operand(NOT_EQUAL));
     }
-    __ Ret(ne);
+    __ Ret();
+    __ bind(&skip);
   } else {
     // Smi compared non-strictly with a non-smi non-heap-number.  Call
     // the runtime.
-    __ b(ne, slow);
+    __ bne(slow);
   }
 
   // Rhs is a smi, lhs is a heap number.
-  // Load the double from lhs, tagged HeapNumber r1, to d7.
-  __ vldr(d7, lhs, HeapNumber::kValueOffset - kHeapObjectTag);
-  // Convert rhs to a double in d6              .
+  // Load the double from lhs, tagged HeapNumber r4, to d7.
+  __ lfd(d7, FieldMemOperand(lhs, HeapNumber::kValueOffset));
+  // Convert rhs to a double in d6.
   __ SmiToDouble(d6, rhs);
   // Fall through to both_loaded_as_doubles.
 }
 
 
 // See comment at call site.
-static void EmitStrictTwoHeapObjectCompare(MacroAssembler* masm,
-                                           Register lhs,
+static void EmitStrictTwoHeapObjectCompare(MacroAssembler* masm, Register lhs,
                                            Register rhs) {
-    DCHECK((lhs.is(r0) && rhs.is(r1)) ||
-           (lhs.is(r1) && rhs.is(r0)));
+  DCHECK((lhs.is(r3) && rhs.is(r4)) || (lhs.is(r4) && rhs.is(r3)));
 
-    // If either operand is a JS object or an oddball value, then they are
-    // not equal since their pointers are different.
-    // There is no test for undetectability in strict equality.
-    STATIC_ASSERT(LAST_TYPE == LAST_SPEC_OBJECT_TYPE);
-    Label first_non_object;
-    // Get the type of the first operand into r2 and compare it with
-    // FIRST_SPEC_OBJECT_TYPE.
-    __ CompareObjectType(rhs, r2, r2, FIRST_SPEC_OBJECT_TYPE);
-    __ b(lt, &first_non_object);
+  // If either operand is a JS object or an oddball value, then they are
+  // not equal since their pointers are different.
+  // There is no test for undetectability in strict equality.
+  STATIC_ASSERT(LAST_TYPE == LAST_SPEC_OBJECT_TYPE);
+  Label first_non_object;
+  // Get the type of the first operand into r5 and compare it with
+  // FIRST_SPEC_OBJECT_TYPE.
+  __ CompareObjectType(rhs, r5, r5, FIRST_SPEC_OBJECT_TYPE);
+  __ blt(&first_non_object);
 
-    // Return non-zero (r0 is not zero)
-    Label return_not_equal;
-    __ bind(&return_not_equal);
-    __ Ret();
+  // Return non-zero (r3 is not zero)
+  Label return_not_equal;
+  __ bind(&return_not_equal);
+  __ Ret();
 
-    __ bind(&first_non_object);
-    // Check for oddballs: true, false, null, undefined.
-    __ cmp(r2, Operand(ODDBALL_TYPE));
-    __ b(eq, &return_not_equal);
+  __ bind(&first_non_object);
+  // Check for oddballs: true, false, null, undefined.
+  __ cmpi(r5, Operand(ODDBALL_TYPE));
+  __ beq(&return_not_equal);
 
-    __ CompareObjectType(lhs, r3, r3, FIRST_SPEC_OBJECT_TYPE);
-    __ b(ge, &return_not_equal);
+  __ CompareObjectType(lhs, r6, r6, FIRST_SPEC_OBJECT_TYPE);
+  __ bge(&return_not_equal);
 
-    // Check for oddballs: true, false, null, undefined.
-    __ cmp(r3, Operand(ODDBALL_TYPE));
-    __ b(eq, &return_not_equal);
+  // Check for oddballs: true, false, null, undefined.
+  __ cmpi(r6, Operand(ODDBALL_TYPE));
+  __ beq(&return_not_equal);
 
-    // Now that we have the types we might as well check for
-    // internalized-internalized.
-    STATIC_ASSERT(kInternalizedTag == 0 && kStringTag == 0);
-    __ orr(r2, r2, Operand(r3));
-    __ tst(r2, Operand(kIsNotStringMask | kIsNotInternalizedMask));
-    __ b(eq, &return_not_equal);
+  // Now that we have the types we might as well check for
+  // internalized-internalized.
+  STATIC_ASSERT(kInternalizedTag == 0 && kStringTag == 0);
+  __ orx(r5, r5, r6);
+  __ andi(r0, r5, Operand(kIsNotStringMask | kIsNotInternalizedMask));
+  __ beq(&return_not_equal, cr0);
 }
 
 
 // See comment at call site.
-static void EmitCheckForTwoHeapNumbers(MacroAssembler* masm,
-                                       Register lhs,
+static void EmitCheckForTwoHeapNumbers(MacroAssembler* masm, Register lhs,
                                        Register rhs,
                                        Label* both_loaded_as_doubles,
-                                       Label* not_heap_numbers,
-                                       Label* slow) {
-  DCHECK((lhs.is(r0) && rhs.is(r1)) ||
-         (lhs.is(r1) && rhs.is(r0)));
+                                       Label* not_heap_numbers, Label* slow) {
+  DCHECK((lhs.is(r3) && rhs.is(r4)) || (lhs.is(r4) && rhs.is(r3)));
 
-  __ CompareObjectType(rhs, r3, r2, HEAP_NUMBER_TYPE);
-  __ b(ne, not_heap_numbers);
-  __ ldr(r2, FieldMemOperand(lhs, HeapObject::kMapOffset));
-  __ cmp(r2, r3);
-  __ b(ne, slow);  // First was a heap number, second wasn't.  Go slow case.
+  __ CompareObjectType(rhs, r6, r5, HEAP_NUMBER_TYPE);
+  __ bne(not_heap_numbers);
+  __ LoadP(r5, FieldMemOperand(lhs, HeapObject::kMapOffset));
+  __ cmp(r5, r6);
+  __ bne(slow);  // First was a heap number, second wasn't.  Go slow case.
 
   // Both are heap numbers.  Load them up then jump to the code we have
   // for that.
-  __ vldr(d6, rhs, HeapNumber::kValueOffset - kHeapObjectTag);
-  __ vldr(d7, lhs, HeapNumber::kValueOffset - kHeapObjectTag);
-  __ jmp(both_loaded_as_doubles);
+  __ lfd(d6, FieldMemOperand(rhs, HeapNumber::kValueOffset));
+  __ lfd(d7, FieldMemOperand(lhs, HeapNumber::kValueOffset));
+
+  __ b(both_loaded_as_doubles);
 }
 
 
 // Fast negative check for internalized-to-internalized equality.
 static void EmitCheckForInternalizedStringsOrObjects(MacroAssembler* masm,
-                                                     Register lhs,
-                                                     Register rhs,
+                                                     Register lhs, Register rhs,
                                                      Label* possible_strings,
                                                      Label* not_both_strings) {
-  DCHECK((lhs.is(r0) && rhs.is(r1)) ||
-         (lhs.is(r1) && rhs.is(r0)));
+  DCHECK((lhs.is(r3) && rhs.is(r4)) || (lhs.is(r4) && rhs.is(r3)));
 
-  // r2 is object type of rhs.
+  // r5 is object type of rhs.
   Label object_test;
   STATIC_ASSERT(kInternalizedTag == 0 && kStringTag == 0);
-  __ tst(r2, Operand(kIsNotStringMask));
-  __ b(ne, &object_test);
-  __ tst(r2, Operand(kIsNotInternalizedMask));
-  __ b(ne, possible_strings);
-  __ CompareObjectType(lhs, r3, r3, FIRST_NONSTRING_TYPE);
-  __ b(ge, not_both_strings);
-  __ tst(r3, Operand(kIsNotInternalizedMask));
-  __ b(ne, possible_strings);
+  __ andi(r0, r5, Operand(kIsNotStringMask));
+  __ bne(&object_test, cr0);
+  __ andi(r0, r5, Operand(kIsNotInternalizedMask));
+  __ bne(possible_strings, cr0);
+  __ CompareObjectType(lhs, r6, r6, FIRST_NONSTRING_TYPE);
+  __ bge(not_both_strings);
+  __ andi(r0, r6, Operand(kIsNotInternalizedMask));
+  __ bne(possible_strings, cr0);
 
   // Both are internalized.  We already checked they weren't the same pointer
   // so they are not equal.
-  __ mov(r0, Operand(NOT_EQUAL));
+  __ li(r3, Operand(NOT_EQUAL));
   __ Ret();
 
   __ bind(&object_test);
-  __ cmp(r2, Operand(FIRST_SPEC_OBJECT_TYPE));
-  __ b(lt, not_both_strings);
-  __ CompareObjectType(lhs, r2, r3, FIRST_SPEC_OBJECT_TYPE);
-  __ b(lt, not_both_strings);
+  __ cmpi(r5, Operand(FIRST_SPEC_OBJECT_TYPE));
+  __ blt(not_both_strings);
+  __ CompareObjectType(lhs, r5, r6, FIRST_SPEC_OBJECT_TYPE);
+  __ blt(not_both_strings);
   // If both objects are undetectable, they are equal. Otherwise, they
   // are not equal, since they are different objects and an object is not
   // equal to undefined.
-  __ ldr(r3, FieldMemOperand(rhs, HeapObject::kMapOffset));
-  __ ldrb(r2, FieldMemOperand(r2, Map::kBitFieldOffset));
-  __ ldrb(r3, FieldMemOperand(r3, Map::kBitFieldOffset));
-  __ and_(r0, r2, Operand(r3));
-  __ and_(r0, r0, Operand(1 << Map::kIsUndetectable));
-  __ eor(r0, r0, Operand(1 << Map::kIsUndetectable));
+  __ LoadP(r6, FieldMemOperand(rhs, HeapObject::kMapOffset));
+  __ lbz(r5, FieldMemOperand(r5, Map::kBitFieldOffset));
+  __ lbz(r6, FieldMemOperand(r6, Map::kBitFieldOffset));
+  __ and_(r3, r5, r6);
+  __ andi(r3, r3, Operand(1 << Map::kIsUndetectable));
+  __ xori(r3, r3, Operand(1 << Map::kIsUndetectable));
   __ Ret();
 }
 
 
 static void CompareICStub_CheckInputType(MacroAssembler* masm, Register input,
                                          Register scratch,
                                          CompareICState::State expected,
                                          Label* fail) {
   Label ok;
   if (expected == CompareICState::SMI) {
     __ JumpIfNotSmi(input, fail);
   } else if (expected == CompareICState::NUMBER) {
     __ JumpIfSmi(input, &ok);
     __ CheckMap(input, scratch, Heap::kHeapNumberMapRootIndex, fail,
                 DONT_DO_SMI_CHECK);
   }
   // We could be strict about internalized/non-internalized here, but as long as
   // hydrogen doesn't care, the stub doesn't have to care either.
   __ bind(&ok);
 }
 
 
-// On entry r1 and r2 are the values to be compared.
-// On exit r0 is 0, positive or negative to indicate the result of
+// On entry r4 and r5 are the values to be compared.
+// On exit r3 is 0, positive or negative to indicate the result of
 // the comparison.
 void CompareICStub::GenerateGeneric(MacroAssembler* masm) {
-  Register lhs = r1;
-  Register rhs = r0;
+  Register lhs = r4;
+  Register rhs = r3;
   Condition cc = GetCondition();
 
   Label miss;
-  CompareICStub_CheckInputType(masm, lhs, r2, left(), &miss);
-  CompareICStub_CheckInputType(masm, rhs, r3, right(), &miss);
+  CompareICStub_CheckInputType(masm, lhs, r5, left(), &miss);
+  CompareICStub_CheckInputType(masm, rhs, r6, right(), &miss);
 
   Label slow;  // Call builtin.
   Label not_smis, both_loaded_as_doubles, lhs_not_nan;
 
   Label not_two_smis, smi_done;
-  __ orr(r2, r1, r0);
-  __ JumpIfNotSmi(r2, &not_two_smis);
-  __ mov(r1, Operand(r1, ASR, 1));
-  __ sub(r0, r1, Operand(r0, ASR, 1));
+  __ orx(r5, r4, r3);
+  __ JumpIfNotSmi(r5, &not_two_smis);
+  __ SmiUntag(r4);
+  __ SmiUntag(r3);
+  __ sub(r3, r4, r3);
   __ Ret();
   __ bind(&not_two_smis);
 
   // NOTICE! This code is only reached after a smi-fast-case check, so
   // it is certain that at least one operand isn't a smi.
 
   // Handle the case where the objects are identical.  Either returns the answer
   // or goes to slow.  Only falls through if the objects were not identical.
   EmitIdenticalObjectComparison(masm, &slow, cc);
 
   // If either is a Smi (we know that not both are), then they can only
   // be strictly equal if the other is a HeapNumber.
   STATIC_ASSERT(kSmiTag == 0);
   DCHECK_EQ(0, Smi::FromInt(0));
-  __ and_(r2, lhs, Operand(rhs));
-  __ JumpIfNotSmi(r2, &not_smis);
+  __ and_(r5, lhs, rhs);
+  __ JumpIfNotSmi(r5, &not_smis);
   // One operand is a smi.  EmitSmiNonsmiComparison generates code that can:
   // 1) Return the answer.
   // 2) Go to slow.
   // 3) Fall through to both_loaded_as_doubles.
   // 4) Jump to lhs_not_nan.
   // In cases 3 and 4 we have found out we were dealing with a number-number
-  // comparison.  If VFP3 is supported the double values of the numbers have
-  // been loaded into d7 and d6.  Otherwise, the double values have been loaded
-  // into r0, r1, r2, and r3.
+  // comparison.  The double values of the numbers have been loaded
+  // into d7 and d6.
   EmitSmiNonsmiComparison(masm, lhs, rhs, &lhs_not_nan, &slow, strict());
 
   __ bind(&both_loaded_as_doubles);
-  // The arguments have been converted to doubles and stored in d6 and d7, if
-  // VFP3 is supported, or in r0, r1, r2, and r3.
+  // The arguments have been converted to doubles and stored in d6 and d7
   __ bind(&lhs_not_nan);
   Label no_nan;
-  // ARMv7 VFP3 instructions to implement double precision comparison.
-  __ VFPCompareAndSetFlags(d7, d6);
-  Label nan;
-  __ b(vs, &nan);
-  __ mov(r0, Operand(EQUAL), LeaveCC, eq);
-  __ mov(r0, Operand(LESS), LeaveCC, lt);
-  __ mov(r0, Operand(GREATER), LeaveCC, gt);
+  __ fcmpu(d7, d6);
+
+  Label nan, equal, less_than;
+  __ bunordered(&nan);
+  __ beq(&equal);
+  __ blt(&less_than);
+  __ li(r3, Operand(GREATER));
+  __ Ret();
+  __ bind(&equal);
+  __ li(r3, Operand(EQUAL));
+  __ Ret();
+  __ bind(&less_than);
+  __ li(r3, Operand(LESS));
   __ Ret();
 
   __ bind(&nan);
-  // If one of the sides was a NaN then the v flag is set.  Load r0 with
+  // If one of the sides was a NaN then the v flag is set.  Load r3 with
   // whatever it takes to make the comparison fail, since comparisons with NaN
   // always fail.
   if (cc == lt || cc == le) {
-    __ mov(r0, Operand(GREATER));
+    __ li(r3, Operand(GREATER));
   } else {
-    __ mov(r0, Operand(LESS));
+    __ li(r3, Operand(LESS));
   }
   __ Ret();
 
   __ bind(&not_smis);
   // At this point we know we are dealing with two different objects,
   // and neither of them is a Smi.  The objects are in rhs_ and lhs_.
   if (strict()) {
     // This returns non-equal for some object types, or falls through if it
     // was not lucky.
     EmitStrictTwoHeapObjectCompare(masm, lhs, rhs);
   }
 
   Label check_for_internalized_strings;
   Label flat_string_check;
   // Check for heap-number-heap-number comparison.  Can jump to slow case,
-  // or load both doubles into r0, r1, r2, r3 and jump to the code that handles
+  // or load both doubles into r3, r4, r5, r6 and jump to the code that handles
   // that case.  If the inputs are not doubles then jumps to
   // check_for_internalized_strings.
-  // In this case r2 will contain the type of rhs_.  Never falls through.
-  EmitCheckForTwoHeapNumbers(masm,
-                             lhs,
-                             rhs,
-                             &both_loaded_as_doubles,
+  // In this case r5 will contain the type of rhs_.  Never falls through.
+  EmitCheckForTwoHeapNumbers(masm, lhs, rhs, &both_loaded_as_doubles,
                              &check_for_internalized_strings,
                              &flat_string_check);
 
   __ bind(&check_for_internalized_strings);
   // In the strict case the EmitStrictTwoHeapObjectCompare already took care of
   // internalized strings.
   if (cc == eq && !strict()) {
     // Returns an answer for two internalized strings or two detectable objects.
     // Otherwise jumps to string case or not both strings case.
-    // Assumes that r2 is the type of rhs_ on entry.
-    EmitCheckForInternalizedStringsOrObjects(
-        masm, lhs, rhs, &flat_string_check, &slow);
+    // Assumes that r5 is the type of rhs_ on entry.
+    EmitCheckForInternalizedStringsOrObjects(masm, lhs, rhs, &flat_string_check,
+                                             &slow);
   }
 
   // Check for both being sequential one-byte strings,
   // and inline if that is the case.
   __ bind(&flat_string_check);
 
-  __ JumpIfNonSmisNotBothSequentialOneByteStrings(lhs, rhs, r2, r3, &slow);
+  __ JumpIfNonSmisNotBothSequentialOneByteStrings(lhs, rhs, r5, r6, &slow);
 
-  __ IncrementCounter(isolate()->counters()->string_compare_native(), 1, r2,
-                      r3);
+  __ IncrementCounter(isolate()->counters()->string_compare_native(), 1, r5,
+                      r6);
   if (cc == eq) {
-    StringHelper::GenerateFlatOneByteStringEquals(masm, lhs, rhs, r2, r3, r4);
+    StringHelper::GenerateFlatOneByteStringEquals(masm, lhs, rhs, r5, r6);
   } else {
-    StringHelper::GenerateCompareFlatOneByteStrings(masm, lhs, rhs, r2, r3, r4,
-                                                    r5);
+    StringHelper::GenerateCompareFlatOneByteStrings(masm, lhs, rhs, r5, r6, r7);
   }
   // Never falls through to here.
 
   __ bind(&slow);
 
   __ Push(lhs, rhs);
   // Figure out which native to call and setup the arguments.
   Builtins::JavaScript native;
   if (cc == eq) {
     native = strict() ? Builtins::STRICT_EQUALS : Builtins::EQUALS;
   } else {
     native = Builtins::COMPARE;
     int ncr;  // NaN compare result
     if (cc == lt || cc == le) {
       ncr = GREATER;
     } else {
       DCHECK(cc == gt || cc == ge);  // remaining cases
       ncr = LESS;
     }
-    __ mov(r0, Operand(Smi::FromInt(ncr)));
-    __ push(r0);
+    __ LoadSmiLiteral(r3, Smi::FromInt(ncr));
+    __ push(r3);
   }
 
   // Call the native; it returns -1 (less), 0 (equal), or 1 (greater)
   // tagged as a small integer.
   __ InvokeBuiltin(native, JUMP_FUNCTION);
 
   __ bind(&miss);
   GenerateMiss(masm);
 }
 
 
 void StoreBufferOverflowStub::Generate(MacroAssembler* masm) {
   // We don't allow a GC during a store buffer overflow so there is no need to
   // store the registers in any particular way, but we do have to store and
   // restore them.
-  __ stm(db_w, sp, kCallerSaved | lr.bit());
-
-  const Register scratch = r1;
-
+  __ mflr(r0);
+  __ MultiPush(kJSCallerSaved | r0.bit());
   if (save_doubles()) {
-    __ SaveFPRegs(sp, scratch);
+    __ SaveFPRegs(sp, 0, DoubleRegister::kNumVolatileRegisters);
   }
   const int argument_count = 1;
   const int fp_argument_count = 0;
+  const Register scratch = r4;
 
   AllowExternalCallThatCantCauseGC scope(masm);
   __ PrepareCallCFunction(argument_count, fp_argument_count, scratch);
-  __ mov(r0, Operand(ExternalReference::isolate_address(isolate())));
-  __ CallCFunction(
-      ExternalReference::store_buffer_overflow_function(isolate()),
-      argument_count);
+  __ mov(r3, Operand(ExternalReference::isolate_address(isolate())));
+  __ CallCFunction(ExternalReference::store_buffer_overflow_function(isolate()),
+                   argument_count);
   if (save_doubles()) {
-    __ RestoreFPRegs(sp, scratch);
+    __ RestoreFPRegs(sp, 0, DoubleRegister::kNumVolatileRegisters);
   }
-  __ ldm(ia_w, sp, kCallerSaved | pc.bit());  // Also pop pc to get Ret(0).
+  __ MultiPop(kJSCallerSaved | r0.bit());
+  __ mtlr(r0);
+  __ Ret();
 }
 
 
 void MathPowStub::Generate(MacroAssembler* masm) {
-  const Register base = r1;
+  const Register base = r4;
   const Register exponent = MathPowTaggedDescriptor::exponent();
-  DCHECK(exponent.is(r2));
-  const Register heapnumbermap = r5;
-  const Register heapnumber = r0;
-  const DwVfpRegister double_base = d0;
-  const DwVfpRegister double_exponent = d1;
-  const DwVfpRegister double_result = d2;
-  const DwVfpRegister double_scratch = d3;
-  const SwVfpRegister single_scratch = s6;
-  const Register scratch = r9;
-  const Register scratch2 = r4;
+  DCHECK(exponent.is(r5));
+  const Register heapnumbermap = r8;
+  const Register heapnumber = r3;
+  const DoubleRegister double_base = d1;
+  const DoubleRegister double_exponent = d2;
+  const DoubleRegister double_result = d3;
+  const DoubleRegister double_scratch = d0;
+  const Register scratch = r11;
+  const Register scratch2 = r10;
 
   Label call_runtime, done, int_exponent;
   if (exponent_type() == ON_STACK) {
     Label base_is_smi, unpack_exponent;
     // The exponent and base are supplied as arguments on the stack.
     // This can only happen if the stub is called from non-optimized code.
     // Load input parameters from stack to double registers.
-    __ ldr(base, MemOperand(sp, 1 * kPointerSize));
-    __ ldr(exponent, MemOperand(sp, 0 * kPointerSize));
+    __ LoadP(base, MemOperand(sp, 1 * kPointerSize));
+    __ LoadP(exponent, MemOperand(sp, 0 * kPointerSize));
 
     __ LoadRoot(heapnumbermap, Heap::kHeapNumberMapRootIndex);
 
     __ UntagAndJumpIfSmi(scratch, base, &base_is_smi);
-    __ ldr(scratch, FieldMemOperand(base, JSObject::kMapOffset));
+    __ LoadP(scratch, FieldMemOperand(base, JSObject::kMapOffset));
     __ cmp(scratch, heapnumbermap);
-    __ b(ne, &call_runtime);
+    __ bne(&call_runtime);
 
-    __ vldr(double_base, FieldMemOperand(base, HeapNumber::kValueOffset));
-    __ jmp(&unpack_exponent);
+    __ lfd(double_base, FieldMemOperand(base, HeapNumber::kValueOffset));
+    __ b(&unpack_exponent);
 
     __ bind(&base_is_smi);
-    __ vmov(single_scratch, scratch);
-    __ vcvt_f64_s32(double_base, single_scratch);
+    __ ConvertIntToDouble(scratch, double_base);
     __ bind(&unpack_exponent);
 
     __ UntagAndJumpIfSmi(scratch, exponent, &int_exponent);
+    __ LoadP(scratch, FieldMemOperand(exponent, JSObject::kMapOffset));
+    __ cmp(scratch, heapnumbermap);
+    __ bne(&call_runtime);
 
-    __ ldr(scratch, FieldMemOperand(exponent, JSObject::kMapOffset));
-    __ cmp(scratch, heapnumbermap);
-    __ b(ne, &call_runtime);
-    __ vldr(double_exponent,
-            FieldMemOperand(exponent, HeapNumber::kValueOffset));
+    __ lfd(double_exponent,
+           FieldMemOperand(exponent, HeapNumber::kValueOffset));
   } else if (exponent_type() == TAGGED) {
     // Base is already in double_base.
     __ UntagAndJumpIfSmi(scratch, exponent, &int_exponent);
 
-    __ vldr(double_exponent,
-            FieldMemOperand(exponent, HeapNumber::kValueOffset));
+    __ lfd(double_exponent,
+           FieldMemOperand(exponent, HeapNumber::kValueOffset));
   }
 
   if (exponent_type() != INTEGER) {
-    Label int_exponent_convert;
     // Detect integer exponents stored as double.
-    __ vcvt_u32_f64(single_scratch, double_exponent);
-    // We do not check for NaN or Infinity here because comparing numbers on
-    // ARM correctly distinguishes NaNs.  We end up calling the built-in.
-    __ vcvt_f64_u32(double_scratch, single_scratch);
-    __ VFPCompareAndSetFlags(double_scratch, double_exponent);
-    __ b(eq, &int_exponent_convert);
+    __ TryDoubleToInt32Exact(scratch, double_exponent, scratch2,
+                             double_scratch);
+    __ beq(&int_exponent);
 
     if (exponent_type() == ON_STACK) {
       // Detect square root case.  Crankshaft detects constant +/-0.5 at
       // compile time and uses DoMathPowHalf instead.  We then skip this check
       // for non-constant cases of +/-0.5 as these hardly occur.
-      Label not_plus_half;
+      Label not_plus_half, not_minus_inf1, not_minus_inf2;
 
       // Test for 0.5.
-      __ vmov(double_scratch, 0.5, scratch);
-      __ VFPCompareAndSetFlags(double_exponent, double_scratch);
-      __ b(ne, &not_plus_half);
+      __ LoadDoubleLiteral(double_scratch, 0.5, scratch);
+      __ fcmpu(double_exponent, double_scratch);
+      __ bne(&not_plus_half);
 
       // Calculates square root of base.  Check for the special case of
       // Math.pow(-Infinity, 0.5) == Infinity (ECMA spec, 15.8.2.13).
-      __ vmov(double_scratch, -V8_INFINITY, scratch);
-      __ VFPCompareAndSetFlags(double_base, double_scratch);
-      __ vneg(double_result, double_scratch, eq);
-      __ b(eq, &done);
+      __ LoadDoubleLiteral(double_scratch, -V8_INFINITY, scratch);
+      __ fcmpu(double_base, double_scratch);
+      __ bne(&not_minus_inf1);
+      __ fneg(double_result, double_scratch);
+      __ b(&done);
+      __ bind(&not_minus_inf1);
 
       // Add +0 to convert -0 to +0.
-      __ vadd(double_scratch, double_base, kDoubleRegZero);
-      __ vsqrt(double_result, double_scratch);
-      __ jmp(&done);
+      __ fadd(double_scratch, double_base, kDoubleRegZero);
+      __ fsqrt(double_result, double_scratch);
+      __ b(&done);
 
       __ bind(&not_plus_half);
-      __ vmov(double_scratch, -0.5, scratch);
-      __ VFPCompareAndSetFlags(double_exponent, double_scratch);
-      __ b(ne, &call_runtime);
+      __ LoadDoubleLiteral(double_scratch, -0.5, scratch);
+      __ fcmpu(double_exponent, double_scratch);
+      __ bne(&call_runtime);
 
       // Calculates square root of base.  Check for the special case of
       // Math.pow(-Infinity, -0.5) == 0 (ECMA spec, 15.8.2.13).
-      __ vmov(double_scratch, -V8_INFINITY, scratch);
-      __ VFPCompareAndSetFlags(double_base, double_scratch);
-      __ vmov(double_result, kDoubleRegZero, eq);
-      __ b(eq, &done);
+      __ LoadDoubleLiteral(double_scratch, -V8_INFINITY, scratch);
+      __ fcmpu(double_base, double_scratch);
+      __ bne(&not_minus_inf2);
+      __ fmr(double_result, kDoubleRegZero);
+      __ b(&done);
+      __ bind(&not_minus_inf2);
 
       // Add +0 to convert -0 to +0.
-      __ vadd(double_scratch, double_base, kDoubleRegZero);
-      __ vmov(double_result, 1.0, scratch);
-      __ vsqrt(double_scratch, double_scratch);
-      __ vdiv(double_result, double_result, double_scratch);
-      __ jmp(&done);
+      __ fadd(double_scratch, double_base, kDoubleRegZero);
+      __ LoadDoubleLiteral(double_result, 1.0, scratch);
+      __ fsqrt(double_scratch, double_scratch);
+      __ fdiv(double_result, double_result, double_scratch);
+      __ b(&done);
     }
 
-    __ push(lr);
+    __ mflr(r0);
+    __ push(r0);
     {
       AllowExternalCallThatCantCauseGC scope(masm);
       __ PrepareCallCFunction(0, 2, scratch);
       __ MovToFloatParameters(double_base, double_exponent);
       __ CallCFunction(
-          ExternalReference::power_double_double_function(isolate()),
-          0, 2);
+          ExternalReference::power_double_double_function(isolate()), 0, 2);
     }
-    __ pop(lr);
+    __ pop(r0);
+    __ mtlr(r0);
     __ MovFromFloatResult(double_result);
-    __ jmp(&done);
-
-    __ bind(&int_exponent_convert);
-    __ vcvt_u32_f64(single_scratch, double_exponent);
-    __ vmov(scratch, single_scratch);
+    __ b(&done);
   }
 
   // Calculate power with integer exponent.
   __ bind(&int_exponent);
 
   // Get two copies of exponent in the registers scratch and exponent.
   if (exponent_type() == INTEGER) {
-    __ mov(scratch, exponent);
+    __ mr(scratch, exponent);
   } else {
     // Exponent has previously been stored into scratch as untagged integer.
-    __ mov(exponent, scratch);
+    __ mr(exponent, scratch);
   }
-  __ vmov(double_scratch, double_base);  // Back up base.
-  __ vmov(double_result, 1.0, scratch2);
+  __ fmr(double_scratch, double_base);  // Back up base.
+  __ li(scratch2, Operand(1));
+  __ ConvertIntToDouble(scratch2, double_result);
 
   // Get absolute value of exponent.
-  __ cmp(scratch, Operand::Zero());
-  __ mov(scratch2, Operand::Zero(), LeaveCC, mi);
-  __ sub(scratch, scratch2, scratch, LeaveCC, mi);
+  Label positive_exponent;
+  __ cmpi(scratch, Operand::Zero());
+  __ bge(&positive_exponent);
+  __ neg(scratch, scratch);
+  __ bind(&positive_exponent);
 
-  Label while_true;
+  Label while_true, no_carry, loop_end;
   __ bind(&while_true);
-  __ mov(scratch, Operand(scratch, ASR, 1), SetCC);
-  __ vmul(double_result, double_result, double_scratch, cs);
-  __ vmul(double_scratch, double_scratch, double_scratch, ne);
-  __ b(ne, &while_true);
+  __ andi(scratch2, scratch, Operand(1));
+  __ beq(&no_carry, cr0);
+  __ fmul(double_result, double_result, double_scratch);
+  __ bind(&no_carry);
+  __ ShiftRightArithImm(scratch, scratch, 1, SetRC);
+  __ beq(&loop_end, cr0);
+  __ fmul(double_scratch, double_scratch, double_scratch);
+  __ b(&while_true);
+  __ bind(&loop_end);
 
-  __ cmp(exponent, Operand::Zero());
-  __ b(ge, &done);
-  __ vmov(double_scratch, 1.0, scratch);
-  __ vdiv(double_result, double_scratch, double_result);
+  __ cmpi(exponent, Operand::Zero());
+  __ bge(&done);
+
+  __ li(scratch2, Operand(1));
+  __ ConvertIntToDouble(scratch2, double_scratch);
+  __ fdiv(double_result, double_scratch, double_result);
   // Test whether result is zero.  Bail out to check for subnormal result.
   // Due to subnormals, x^-y == (1/x)^y does not hold in all cases.
-  __ VFPCompareAndSetFlags(double_result, 0.0);
-  __ b(ne, &done);
+  __ fcmpu(double_result, kDoubleRegZero);
+  __ bne(&done);
   // double_exponent may not containe the exponent value if the input was a
   // smi.  We set it with exponent value before bailing out.
-  __ vmov(single_scratch, exponent);
-  __ vcvt_f64_s32(double_exponent, single_scratch);
+  __ ConvertIntToDouble(exponent, double_exponent);
 
   // Returning or bailing out.
   Counters* counters = isolate()->counters();
   if (exponent_type() == ON_STACK) {
     // The arguments are still on the stack.
     __ bind(&call_runtime);
     __ TailCallRuntime(Runtime::kMathPowRT, 2, 1);
 
     // The stub is called from non-optimized code, which expects the result
     // as heap number in exponent.
     __ bind(&done);
-    __ AllocateHeapNumber(
-        heapnumber, scratch, scratch2, heapnumbermap, &call_runtime);
-    __ vstr(double_result,
+    __ AllocateHeapNumber(heapnumber, scratch, scratch2, heapnumbermap,
+                          &call_runtime);
+    __ stfd(double_result,
             FieldMemOperand(heapnumber, HeapNumber::kValueOffset));
-    DCHECK(heapnumber.is(r0));
+    DCHECK(heapnumber.is(r3));
     __ IncrementCounter(counters->math_pow(), 1, scratch, scratch2);
     __ Ret(2);
   } else {
-    __ push(lr);
+    __ mflr(r0);
+    __ push(r0);
     {
       AllowExternalCallThatCantCauseGC scope(masm);
       __ PrepareCallCFunction(0, 2, scratch);
       __ MovToFloatParameters(double_base, double_exponent);
       __ CallCFunction(
-          ExternalReference::power_double_double_function(isolate()),
-          0, 2);
+          ExternalReference::power_double_double_function(isolate()), 0, 2);
     }
-    __ pop(lr);
+    __ pop(r0);
+    __ mtlr(r0);
     __ MovFromFloatResult(double_result);
 
     __ bind(&done);
     __ IncrementCounter(counters->math_pow(), 1, scratch, scratch2);
     __ Ret();
   }
 }
 
 
-bool CEntryStub::NeedsImmovableCode() {
-  return true;
-}
+bool CEntryStub::NeedsImmovableCode() { return true; }
 
 
 void CodeStub::GenerateStubsAheadOfTime(Isolate* isolate) {
   CEntryStub::GenerateAheadOfTime(isolate);
-  WriteInt32ToHeapNumberStub::GenerateFixedRegStubsAheadOfTime(isolate);
+  //  WriteInt32ToHeapNumberStub::GenerateFixedRegStubsAheadOfTime(isolate);

[danno, 2014/10/20 08:28:43]

Really delete this line?

[andrew_low, 2014/11/07 18:03:17]

When we were doing this work originally including this line caused a crash on
startup.

At this point - by running without this line, it caused this code
https://codereview.chromium.org/571173003/diff/20001/src/ppc/code-stubs-ppc.c...
to not be needed. 

I'd like to simply beg forgiveness for this missing part of the implementation
to help us get past this code contribution. We'll take another run at including
it in the near future.

[andrew_low, 2014/11/07 19:25:28]

Hah. One of the guys here looked at it, and it appears that this is 'dead' code
even on ARM. So it should be removed from PPC and ARM (along with the associated
code).

   StoreBufferOverflowStub::GenerateFixedRegStubsAheadOfTime(isolate);
   StubFailureTrampolineStub::GenerateAheadOfTime(isolate);
   ArrayConstructorStubBase::GenerateStubsAheadOfTime(isolate);
   CreateAllocationSiteStub::GenerateAheadOfTime(isolate);
   BinaryOpICStub::GenerateAheadOfTime(isolate);
   BinaryOpICWithAllocationSiteStub::GenerateAheadOfTime(isolate);
 }
 
 
 void CodeStub::GenerateFPStubs(Isolate* isolate) {
   // Generate if not already in cache.
   SaveFPRegsMode mode = kSaveFPRegs;
   CEntryStub(isolate, 1, mode).GetCode();
   StoreBufferOverflowStub(isolate, mode).GetCode();
   isolate->set_fp_stubs_generated(true);
 }
 
 
 void CEntryStub::GenerateAheadOfTime(Isolate* isolate) {
   CEntryStub stub(isolate, 1, kDontSaveFPRegs);
   stub.GetCode();
 }
 
 
 void CEntryStub::Generate(MacroAssembler* masm) {
   // Called from JavaScript; parameters are on stack as if calling JS function.
-  // r0: number of arguments including receiver
-  // r1: pointer to builtin function
+  // r3: number of arguments including receiver
+  // r4: pointer to builtin function
   // fp: frame pointer  (restored after C call)
   // sp: stack pointer  (restored as callee's sp after C call)
   // cp: current context  (C callee-saved)
 
   ProfileEntryHookStub::MaybeCallEntryHook(masm);
 
-  __ mov(r5, Operand(r1));
+  __ mr(r15, r4);
 
-  // Compute the argv pointer in a callee-saved register.
-  __ add(r1, sp, Operand(r0, LSL, kPointerSizeLog2));
-  __ sub(r1, r1, Operand(kPointerSize));
+  // Compute the argv pointer.
+  __ ShiftLeftImm(r4, r3, Operand(kPointerSizeLog2));
+  __ add(r4, r4, sp);
+  __ subi(r4, r4, Operand(kPointerSize));
 
   // Enter the exit frame that transitions from JavaScript to C++.
   FrameScope scope(masm, StackFrame::MANUAL);
-  __ EnterExitFrame(save_doubles());
+
+  // Need at least one extra slot for return address location.
+  int arg_stack_space = 1;
+
+// PPC LINUX ABI:
+#if V8_TARGET_ARCH_PPC64 && !ABI_RETURNS_OBJECT_PAIRS_IN_REGS
+  // Pass buffer for return value on stack if necessary
+  if (result_size() > 1) {
+    DCHECK_EQ(2, result_size());
+    arg_stack_space += 2;
+  }
+#endif
+
+  __ EnterExitFrame(save_doubles(), arg_stack_space);
 
   // Store a copy of argc in callee-saved registers for later.
-  __ mov(r4, Operand(r0));
+  __ mr(r14, r3);
 
-  // r0, r4: number of arguments including receiver  (C callee-saved)
-  // r1: pointer to the first argument (C callee-saved)
-  // r5: pointer to builtin function  (C callee-saved)
+  // r3, r14: number of arguments including receiver  (C callee-saved)
+  // r4: pointer to the first argument
+  // r15: pointer to builtin function  (C callee-saved)
 
-  // Result returned in r0 or r0+r1 by default.
+  // Result returned in registers or stack, depending on result size and ABI.
 
-#if V8_HOST_ARCH_ARM
-  int frame_alignment = MacroAssembler::ActivationFrameAlignment();
-  int frame_alignment_mask = frame_alignment - 1;
-  if (FLAG_debug_code) {
-    if (frame_alignment > kPointerSize) {
-      Label alignment_as_expected;
-      DCHECK(base::bits::IsPowerOfTwo32(frame_alignment));
-      __ tst(sp, Operand(frame_alignment_mask));
-      __ b(eq, &alignment_as_expected);
-      // Don't use Check here, as it will call Runtime_Abort re-entering here.
-      __ stop("Unexpected alignment");
-      __ bind(&alignment_as_expected);
-    }
+  Register isolate_reg = r5;
+#if V8_TARGET_ARCH_PPC64 && !ABI_RETURNS_OBJECT_PAIRS_IN_REGS
+  if (result_size() > 1) {
+    // The return value is 16-byte non-scalar value.
+    // Use frame storage reserved by calling function to pass return
+    // buffer as implicit first argument.
+    __ mr(r5, r4);
+    __ mr(r4, r3);
+    __ addi(r3, sp, Operand((kStackFrameExtraParamSlot + 1) * kPointerSize));
+    isolate_reg = r6;
   }
 #endif
 
   // Call C built-in.
-  // r0 = argc, r1 = argv
-  __ mov(r2, Operand(ExternalReference::isolate_address(isolate())));
+  __ mov(isolate_reg, Operand(ExternalReference::isolate_address(isolate())));
+
+#if ABI_USES_FUNCTION_DESCRIPTORS && !defined(USE_SIMULATOR)
+  // Native AIX/PPC64 Linux use a function descriptor.
+  __ LoadP(ToRegister(ABI_TOC_REGISTER), MemOperand(r15, kPointerSize));
+  __ LoadP(ip, MemOperand(r15, 0));  // Instruction address
+  Register target = ip;
+#elif ABI_TOC_ADDRESSABILITY_VIA_IP
+  __ Move(ip, r15);
+  Register target = ip;
+#else
+  Register target = r15;
+#endif
 
   // To let the GC traverse the return address of the exit frames, we need to
   // know where the return address is. The CEntryStub is unmovable, so
   // we can store the address on the stack to be able to find it again and
   // we never have to restore it, because it will not change.
   // Compute the return address in lr to return to after the jump below. Pc is
   // already at '+ 8' from the current instruction but return is after three
   // instructions so add another 4 to pc to get the return address.
   {
-    // Prevent literal pool emission before return address.
-    Assembler::BlockConstPoolScope block_const_pool(masm);
-    __ add(lr, pc, Operand(4));
-    __ str(lr, MemOperand(sp, 0));
-    __ Call(r5);
-  }
-
-  __ VFPEnsureFPSCRState(r2);
+    Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm);
+    Label here;
+    __ b(&here, SetLK);
+    __ bind(&here);
+    __ mflr(r8);
+
+    // Constant used below is dependent on size of Call() macro instructions
+    __ addi(r0, r8, Operand(20));
+
+    __ StoreP(r0, MemOperand(sp, kStackFrameExtraParamSlot * kPointerSize));
+    __ Call(target);
+  }
+
+// roohack - do we need to (re)set FPU state?
+
+#if V8_TARGET_ARCH_PPC64 && !ABI_RETURNS_OBJECT_PAIRS_IN_REGS
+  // If return value is on the stack, pop it to registers.
+  if (result_size() > 1) {
+    __ LoadP(r4, MemOperand(r3, kPointerSize));
+    __ LoadP(r3, MemOperand(r3));
+  }
+#endif
 
   // Runtime functions should not return 'the hole'.  Allowing it to escape may
   // lead to crashes in the IC code later.
   if (FLAG_debug_code) {
     Label okay;
-    __ CompareRoot(r0, Heap::kTheHoleValueRootIndex);
-    __ b(ne, &okay);
+    __ CompareRoot(r3, Heap::kTheHoleValueRootIndex);
+    __ bne(&okay);
     __ stop("The hole escaped");
     __ bind(&okay);
   }
 
   // Check result for exception sentinel.
   Label exception_returned;
-  __ CompareRoot(r0, Heap::kExceptionRootIndex);
-  __ b(eq, &exception_returned);
-
-  ExternalReference pending_exception_address(
-      Isolate::kPendingExceptionAddress, isolate());
+  __ CompareRoot(r3, Heap::kExceptionRootIndex);
+  __ beq(&exception_returned);
+
+  ExternalReference pending_exception_address(Isolate::kPendingExceptionAddress,
+                                              isolate());
 
   // Check that there is no pending exception, otherwise we
   // should have returned the exception sentinel.
   if (FLAG_debug_code) {
     Label okay;
-    __ mov(r2, Operand(pending_exception_address));
-    __ ldr(r2, MemOperand(r2));
-    __ CompareRoot(r2, Heap::kTheHoleValueRootIndex);
+    __ mov(r5, Operand(pending_exception_address));
+    __ LoadP(r5, MemOperand(r5));
+    __ CompareRoot(r5, Heap::kTheHoleValueRootIndex);
     // Cannot use check here as it attempts to generate call into runtime.
-    __ b(eq, &okay);
+    __ beq(&okay);
     __ stop("Unexpected pending exception");
     __ bind(&okay);
   }
 
   // Exit C frame and return.
-  // r0:r1: result
+  // r3:r4: result
   // sp: stack pointer
   // fp: frame pointer
-  // Callee-saved register r4 still holds argc.
-  __ LeaveExitFrame(save_doubles(), r4, true);
-  __ mov(pc, lr);
+  // r14: still holds argc (callee-saved).
+  __ LeaveExitFrame(save_doubles(), r14, true);
+  __ blr();
 
   // Handling of exception.
   __ bind(&exception_returned);
 
   // Retrieve the pending exception.
-  __ mov(r2, Operand(pending_exception_address));
-  __ ldr(r0, MemOperand(r2));
+  __ mov(r5, Operand(pending_exception_address));
+  __ LoadP(r3, MemOperand(r5));
 
   // Clear the pending exception.
-  __ LoadRoot(r3, Heap::kTheHoleValueRootIndex);
-  __ str(r3, MemOperand(r2));
+  __ LoadRoot(r6, Heap::kTheHoleValueRootIndex);
+  __ StoreP(r6, MemOperand(r5));
 
   // Special handling of termination exceptions which are uncatchable
   // by javascript code.
   Label throw_termination_exception;
-  __ CompareRoot(r0, Heap::kTerminationExceptionRootIndex);
-  __ b(eq, &throw_termination_exception);
+  __ CompareRoot(r3, Heap::kTerminationExceptionRootIndex);
+  __ beq(&throw_termination_exception);
 
   // Handle normal exception.
-  __ Throw(r0);
+  __ Throw(r3);
 
   __ bind(&throw_termination_exception);
-  __ ThrowUncatchable(r0);
+  __ ThrowUncatchable(r3);
 }
 
 
 void JSEntryStub::Generate(MacroAssembler* masm) {
-  // r0: code entry
-  // r1: function
-  // r2: receiver
-  // r3: argc
+  // r3: code entry
+  // r4: function
+  // r5: receiver
+  // r6: argc
   // [sp+0]: argv
 
   Label invoke, handler_entry, exit;
 
+// Called from C
+#if ABI_USES_FUNCTION_DESCRIPTORS
+  __ function_descriptor();
+#endif
+
   ProfileEntryHookStub::MaybeCallEntryHook(masm);
 
-  // Called from C, so do not pop argc and args on exit (preserve sp)
-  // No need to save register-passed args
-  // Save callee-saved registers (incl. cp and fp), sp, and lr
-  __ stm(db_w, sp, kCalleeSaved | lr.bit());
-
-  // Save callee-saved vfp registers.
-  __ vstm(db_w, sp, kFirstCalleeSavedDoubleReg, kLastCalleeSavedDoubleReg);
-  // Set up the reserved register for 0.0.
-  __ vmov(kDoubleRegZero, 0.0);
-  __ VFPEnsureFPSCRState(r4);
-
-  // Get address of argv, see stm above.
-  // r0: code entry
-  // r1: function
-  // r2: receiver
-  // r3: argc
-
-  // Set up argv in r4.
-  int offset_to_argv = (kNumCalleeSaved + 1) * kPointerSize;
-  offset_to_argv += kNumDoubleCalleeSaved * kDoubleSize;
-  __ ldr(r4, MemOperand(sp, offset_to_argv));
+  // PPC LINUX ABI:
+  // preserve LR in pre-reserved slot in caller's frame
+  __ mflr(r0);
+  __ StoreP(r0, MemOperand(sp, kStackFrameLRSlot * kPointerSize));
+
+  // Save callee saved registers on the stack.
+  __ MultiPush(kCalleeSaved);
+
+  // Floating point regs FPR0 - FRP13 are volatile
+  // FPR14-FPR31 are non-volatile, but sub-calls will save them for us
+
+  //  int offset_to_argv = kPointerSize * 22; // matches (22*4) above
+  //  __ lwz(r7, MemOperand(sp, offset_to_argv));
 
   // Push a frame with special values setup to mark it as an entry frame.
-  // r0: code entry
-  // r1: function
-  // r2: receiver
-  // r3: argc
-  // r4: argv
+  // r3: code entry
+  // r4: function
+  // r5: receiver
+  // r6: argc
+  // r7: argv
+  __ li(r0, Operand(-1));  // Push a bad frame pointer to fail if it is used.
+  __ push(r0);
+#if V8_OOL_CONSTANT_POOL
+  __ mov(kConstantPoolRegister,
+         Operand(isolate()->factory()->empty_constant_pool_array()));
+  __ push(kConstantPoolRegister);
+#endif
   int marker = type();
-  if (FLAG_enable_ool_constant_pool) {
-    __ mov(r8, Operand(isolate()->factory()->empty_constant_pool_array()));
-  }
-  __ mov(r7, Operand(Smi::FromInt(marker)));
-  __ mov(r6, Operand(Smi::FromInt(marker)));
-  __ mov(r5,
-         Operand(ExternalReference(Isolate::kCEntryFPAddress, isolate())));
-  __ ldr(r5, MemOperand(r5));
-  __ mov(ip, Operand(-1));  // Push a bad frame pointer to fail if it is used.
-  __ stm(db_w, sp, r5.bit() | r6.bit() | r7.bit() |
-                   (FLAG_enable_ool_constant_pool ? r8.bit() : 0) |
-                   ip.bit());
+  __ LoadSmiLiteral(r0, Smi::FromInt(marker));
+  __ push(r0);
+  __ push(r0);
+  // Save copies of the top frame descriptor on the stack.
+  __ mov(r8, Operand(ExternalReference(Isolate::kCEntryFPAddress, isolate())));
+  __ LoadP(r0, MemOperand(r8));
+  __ push(r0);
 
   // Set up frame pointer for the frame to be pushed.
-  __ add(fp, sp, Operand(-EntryFrameConstants::kCallerFPOffset));
+  __ addi(fp, sp, Operand(-EntryFrameConstants::kCallerFPOffset));
 
   // If this is the outermost JS call, set js_entry_sp value.
   Label non_outermost_js;
   ExternalReference js_entry_sp(Isolate::kJSEntrySPAddress, isolate());
-  __ mov(r5, Operand(ExternalReference(js_entry_sp)));
-  __ ldr(r6, MemOperand(r5));
-  __ cmp(r6, Operand::Zero());
-  __ b(ne, &non_outermost_js);
-  __ str(fp, MemOperand(r5));
-  __ mov(ip, Operand(Smi::FromInt(StackFrame::OUTERMOST_JSENTRY_FRAME)));
+  __ mov(r8, Operand(ExternalReference(js_entry_sp)));
+  __ LoadP(r9, MemOperand(r8));
+  __ cmpi(r9, Operand::Zero());
+  __ bne(&non_outermost_js);
+  __ StoreP(fp, MemOperand(r8));
+  __ LoadSmiLiteral(ip, Smi::FromInt(StackFrame::OUTERMOST_JSENTRY_FRAME));
   Label cont;
   __ b(&cont);
   __ bind(&non_outermost_js);
-  __ mov(ip, Operand(Smi::FromInt(StackFrame::INNER_JSENTRY_FRAME)));
+  __ LoadSmiLiteral(ip, Smi::FromInt(StackFrame::INNER_JSENTRY_FRAME));
   __ bind(&cont);
-  __ push(ip);
+  __ push(ip);  // frame-type
 
   // Jump to a faked try block that does the invoke, with a faked catch
   // block that sets the pending exception.
-  __ jmp(&invoke);
-
-  // Block literal pool emission whilst taking the position of the handler
-  // entry. This avoids making the assumption that literal pools are always
-  // emitted after an instruction is emitted, rather than before.
-  {
-    Assembler::BlockConstPoolScope block_const_pool(masm);
-    __ bind(&handler_entry);
-    handler_offset_ = handler_entry.pos();
-    // Caught exception: Store result (exception) in the pending exception
-    // field in the JSEnv and return a failure sentinel.  Coming in here the
-    // fp will be invalid because the PushTryHandler below sets it to 0 to
-    // signal the existence of the JSEntry frame.
-    __ mov(ip, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
-                                         isolate())));
-  }
-  __ str(r0, MemOperand(ip));
-  __ LoadRoot(r0, Heap::kExceptionRootIndex);
+  __ b(&invoke);
+
+  __ bind(&handler_entry);
+  handler_offset_ = handler_entry.pos();
+  // Caught exception: Store result (exception) in the pending exception
+  // field in the JSEnv and return a failure sentinel.  Coming in here the
+  // fp will be invalid because the PushTryHandler below sets it to 0 to
+  // signal the existence of the JSEntry frame.
+  __ mov(ip, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
+                                       isolate())));
+
+  __ StoreP(r3, MemOperand(ip));
+  __ LoadRoot(r3, Heap::kExceptionRootIndex);
   __ b(&exit);
 
   // Invoke: Link this frame into the handler chain.  There's only one
   // handler block in this code object, so its index is 0.
   __ bind(&invoke);
-  // Must preserve r0-r4, r5-r6 are available.
+  // Must preserve r0-r4, r5-r7 are available. (needs update for PPC)
   __ PushTryHandler(StackHandler::JS_ENTRY, 0);
   // If an exception not caught by another handler occurs, this handler
-  // returns control to the code after the bl(&invoke) above, which
+  // returns control to the code after the b(&invoke) above, which
   // restores all kCalleeSaved registers (including cp and fp) to their
   // saved values before returning a failure to C.
 
   // Clear any pending exceptions.
-  __ mov(r5, Operand(isolate()->factory()->the_hole_value()));
+  __ mov(r8, Operand(isolate()->factory()->the_hole_value()));
   __ mov(ip, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
                                        isolate())));
-  __ str(r5, MemOperand(ip));
+  __ StoreP(r8, MemOperand(ip));
 
   // Invoke the function by calling through JS entry trampoline builtin.
   // Notice that we cannot store a reference to the trampoline code directly in
   // this stub, because runtime stubs are not traversed when doing GC.
 
   // Expected registers by Builtins::JSEntryTrampoline
-  // r0: code entry
-  // r1: function
-  // r2: receiver
-  // r3: argc
-  // r4: argv
+  // r3: code entry
+  // r4: function
+  // r5: receiver
+  // r6: argc
+  // r7: argv
   if (type() == StackFrame::ENTRY_CONSTRUCT) {
     ExternalReference construct_entry(Builtins::kJSConstructEntryTrampoline,
                                       isolate());
     __ mov(ip, Operand(construct_entry));
   } else {
     ExternalReference entry(Builtins::kJSEntryTrampoline, isolate());
     __ mov(ip, Operand(entry));
   }
-  __ ldr(ip, MemOperand(ip));  // deref address
-  __ add(ip, ip, Operand(Code::kHeaderSize - kHeapObjectTag));
+  __ LoadP(ip, MemOperand(ip));  // deref address
 
   // Branch and link to JSEntryTrampoline.
-  __ Call(ip);
+  // the address points to the start of the code object, skip the header
+  __ addi(ip, ip, Operand(Code::kHeaderSize - kHeapObjectTag));
+  __ mtctr(ip);
+  __ bctrl();  // make the call
 
   // Unlink this frame from the handler chain.
   __ PopTryHandler();
 
-  __ bind(&exit);  // r0 holds result
+  __ bind(&exit);  // r3 holds result
   // Check if the current stack frame is marked as the outermost JS frame.
   Label non_outermost_js_2;
-  __ pop(r5);
-  __ cmp(r5, Operand(Smi::FromInt(StackFrame::OUTERMOST_JSENTRY_FRAME)));
-  __ b(ne, &non_outermost_js_2);
-  __ mov(r6, Operand::Zero());
-  __ mov(r5, Operand(ExternalReference(js_entry_sp)));
-  __ str(r6, MemOperand(r5));
+  __ pop(r8);
+  __ CmpSmiLiteral(r8, Smi::FromInt(StackFrame::OUTERMOST_JSENTRY_FRAME), r0);
+  __ bne(&non_outermost_js_2);
+  __ mov(r9, Operand::Zero());
+  __ mov(r8, Operand(ExternalReference(js_entry_sp)));
+  __ StoreP(r9, MemOperand(r8));
   __ bind(&non_outermost_js_2);
 
   // Restore the top frame descriptors from the stack.
-  __ pop(r3);
-  __ mov(ip,
-         Operand(ExternalReference(Isolate::kCEntryFPAddress, isolate())));
-  __ str(r3, MemOperand(ip));
+  __ pop(r6);
+  __ mov(ip, Operand(ExternalReference(Isolate::kCEntryFPAddress, isolate())));
+  __ StoreP(r6, MemOperand(ip));
 
   // Reset the stack to the callee saved registers.
-  __ add(sp, sp, Operand(-EntryFrameConstants::kCallerFPOffset));
+  __ addi(sp, sp, Operand(-EntryFrameConstants::kCallerFPOffset));
 
-  // Restore callee-saved registers and return.
+// Restore callee-saved registers and return.
 #ifdef DEBUG
   if (FLAG_debug_code) {
-    __ mov(lr, Operand(pc));
+    Label here;
+    __ b(&here, SetLK);
+    __ bind(&here);
   }
 #endif
 
-  // Restore callee-saved vfp registers.
-  __ vldm(ia_w, sp, kFirstCalleeSavedDoubleReg, kLastCalleeSavedDoubleReg);
+  __ MultiPop(kCalleeSaved);
 
-  __ ldm(ia_w, sp, kCalleeSaved | pc.bit());
+  __ LoadP(r0, MemOperand(sp, kStackFrameLRSlot * kPointerSize));
+  __ mtctr(r0);
+  __ bctr();
 }
 
 
-// Uses registers r0 to r4.
+// Uses registers r3 to r7.
 // Expected input (depending on whether args are in registers or on the stack):
-// * object: r0 or at sp + 1 * kPointerSize.
-// * function: r1 or at sp.
+// * object: r3 or at sp + 1 * kPointerSize.
+// * function: r4 or at sp.
 //
 // An inlined call site may have been generated before calling this stub.
-// In this case the offset to the inline sites to patch are passed in r5 and r6.
+// In this case the offset to the inline site to patch is passed in r8.
 // (See LCodeGen::DoInstanceOfKnownGlobal)
 void InstanceofStub::Generate(MacroAssembler* masm) {
   // Call site inlining and patching implies arguments in registers.
   DCHECK(HasArgsInRegisters() || !HasCallSiteInlineCheck());
 
   // Fixed register usage throughout the stub:
-  const Register object = r0;  // Object (lhs).
-  Register map = r3;  // Map of the object.
-  const Register function = r1;  // Function (rhs).
-  const Register prototype = r4;  // Prototype of the function.
-  const Register scratch = r2;
+  const Register object = r3;     // Object (lhs).
+  Register map = r6;              // Map of the object.
+  const Register function = r4;   // Function (rhs).
+  const Register prototype = r7;  // Prototype of the function.
+  const Register inline_site = r9;
+  const Register scratch = r5;
+  Register scratch3 = no_reg;
+
+// delta = mov + unaligned LoadP + cmp + bne
+#if V8_TARGET_ARCH_PPC64
+  const int32_t kDeltaToLoadBoolResult =
+      (Assembler::kMovInstructions + 4) * Assembler::kInstrSize;
+#else
+  const int32_t kDeltaToLoadBoolResult =
+      (Assembler::kMovInstructions + 3) * Assembler::kInstrSize;
+#endif
 
   Label slow, loop, is_instance, is_not_instance, not_js_object;
 
   if (!HasArgsInRegisters()) {
-    __ ldr(object, MemOperand(sp, 1 * kPointerSize));
-    __ ldr(function, MemOperand(sp, 0));
+    __ LoadP(object, MemOperand(sp, 1 * kPointerSize));
+    __ LoadP(function, MemOperand(sp, 0));
   }
 
   // Check that the left hand is a JS object and load map.
   __ JumpIfSmi(object, &not_js_object);
   __ IsObjectJSObjectType(object, map, scratch, &not_js_object);
 
   // If there is a call site cache don't look in the global cache, but do the
   // real lookup and update the call site cache.
   if (!HasCallSiteInlineCheck() && !ReturnTrueFalseObject()) {
     Label miss;
     __ CompareRoot(function, Heap::kInstanceofCacheFunctionRootIndex);
-    __ b(ne, &miss);
+    __ bne(&miss);
     __ CompareRoot(map, Heap::kInstanceofCacheMapRootIndex);
-    __ b(ne, &miss);
-    __ LoadRoot(r0, Heap::kInstanceofCacheAnswerRootIndex);
+    __ bne(&miss);
+    __ LoadRoot(r3, Heap::kInstanceofCacheAnswerRootIndex);
     __ Ret(HasArgsInRegisters() ? 0 : 2);
 
     __ bind(&miss);
   }
 
   // Get the prototype of the function.
   __ TryGetFunctionPrototype(function, prototype, scratch, &slow, true);
 
   // Check that the function prototype is a JS object.
   __ JumpIfSmi(prototype, &slow);
   __ IsObjectJSObjectType(prototype, scratch, scratch, &slow);
 
   // Update the global instanceof or call site inlined cache with the current
   // map and function. The cached answer will be set when it is known below.
   if (!HasCallSiteInlineCheck()) {
     __ StoreRoot(function, Heap::kInstanceofCacheFunctionRootIndex);
     __ StoreRoot(map, Heap::kInstanceofCacheMapRootIndex);
   } else {
     DCHECK(HasArgsInRegisters());
     // Patch the (relocated) inlined map check.
 
-    // The map_load_offset was stored in r5
+    // The offset was stored in r8
     //   (See LCodeGen::DoDeferredLInstanceOfKnownGlobal).
-    const Register map_load_offset = r5;
-    __ sub(r9, lr, map_load_offset);
-    // Get the map location in r5 and patch it.
-    __ GetRelocatedValueLocation(r9, map_load_offset, scratch);
-    __ ldr(map_load_offset, MemOperand(map_load_offset));
-    __ str(map, FieldMemOperand(map_load_offset, Cell::kValueOffset));
+    const Register offset = r8;
+    __ mflr(inline_site);
+    __ sub(inline_site, inline_site, offset);
+    // Get the map location in r8 and patch it.
+    __ GetRelocatedValue(inline_site, offset, scratch);
+    __ StoreP(map, FieldMemOperand(offset, Cell::kValueOffset), r0);
   }
 
-  // Register mapping: r3 is object map and r4 is function prototype.
-  // Get prototype of object into r2.
-  __ ldr(scratch, FieldMemOperand(map, Map::kPrototypeOffset));
+  // Register mapping: r6 is object map and r7 is function prototype.
+  // Get prototype of object into r5.
+  __ LoadP(scratch, FieldMemOperand(map, Map::kPrototypeOffset));
 
   // We don't need map any more. Use it as a scratch register.
-  Register scratch2 = map;
+  scratch3 = map;
   map = no_reg;
 
   // Loop through the prototype chain looking for the function prototype.
-  __ LoadRoot(scratch2, Heap::kNullValueRootIndex);
+  __ LoadRoot(scratch3, Heap::kNullValueRootIndex);
   __ bind(&loop);
-  __ cmp(scratch, Operand(prototype));
-  __ b(eq, &is_instance);
-  __ cmp(scratch, scratch2);
-  __ b(eq, &is_not_instance);
-  __ ldr(scratch, FieldMemOperand(scratch, HeapObject::kMapOffset));
-  __ ldr(scratch, FieldMemOperand(scratch, Map::kPrototypeOffset));
-  __ jmp(&loop);
+  __ cmp(scratch, prototype);
+  __ beq(&is_instance);
+  __ cmp(scratch, scratch3);
+  __ beq(&is_not_instance);
+  __ LoadP(scratch, FieldMemOperand(scratch, HeapObject::kMapOffset));
+  __ LoadP(scratch, FieldMemOperand(scratch, Map::kPrototypeOffset));
+  __ b(&loop);
   Factory* factory = isolate()->factory();
 
   __ bind(&is_instance);
   if (!HasCallSiteInlineCheck()) {
-    __ mov(r0, Operand(Smi::FromInt(0)));
-    __ StoreRoot(r0, Heap::kInstanceofCacheAnswerRootIndex);
+    __ LoadSmiLiteral(r3, Smi::FromInt(0));
+    __ StoreRoot(r3, Heap::kInstanceofCacheAnswerRootIndex);
     if (ReturnTrueFalseObject()) {
-      __ Move(r0, factory->true_value());
+      __ Move(r3, factory->true_value());
     }
   } else {
     // Patch the call site to return true.
-    __ LoadRoot(r0, Heap::kTrueValueRootIndex);
-    // The bool_load_offset was stored in r6
-    //   (See LCodeGen::DoDeferredLInstanceOfKnownGlobal).
-    const Register bool_load_offset = r6;
-    __ sub(r9, lr, bool_load_offset);
+    __ LoadRoot(r3, Heap::kTrueValueRootIndex);
+    __ addi(inline_site, inline_site, Operand(kDeltaToLoadBoolResult));
     // Get the boolean result location in scratch and patch it.
-    __ GetRelocatedValueLocation(r9, scratch, scratch2);
-    __ str(r0, MemOperand(scratch));
+    __ SetRelocatedValue(inline_site, scratch, r3);
 
     if (!ReturnTrueFalseObject()) {
-      __ mov(r0, Operand(Smi::FromInt(0)));
+      __ LoadSmiLiteral(r3, Smi::FromInt(0));
     }
   }
   __ Ret(HasArgsInRegisters() ? 0 : 2);
 
   __ bind(&is_not_instance);
   if (!HasCallSiteInlineCheck()) {
-    __ mov(r0, Operand(Smi::FromInt(1)));
-    __ StoreRoot(r0, Heap::kInstanceofCacheAnswerRootIndex);
+    __ LoadSmiLiteral(r3, Smi::FromInt(1));
+    __ StoreRoot(r3, Heap::kInstanceofCacheAnswerRootIndex);
     if (ReturnTrueFalseObject()) {
-      __ Move(r0, factory->false_value());
+      __ Move(r3, factory->false_value());
     }
   } else {
     // Patch the call site to return false.
-    __ LoadRoot(r0, Heap::kFalseValueRootIndex);
-    // The bool_load_offset was stored in r6
-    //   (See LCodeGen::DoDeferredLInstanceOfKnownGlobal).
-    const Register bool_load_offset = r6;
-    __ sub(r9, lr, bool_load_offset);
-    ;
+    __ LoadRoot(r3, Heap::kFalseValueRootIndex);
+    __ addi(inline_site, inline_site, Operand(kDeltaToLoadBoolResult));
     // Get the boolean result location in scratch and patch it.
-    __ GetRelocatedValueLocation(r9, scratch, scratch2);
-    __ str(r0, MemOperand(scratch));
+    __ SetRelocatedValue(inline_site, scratch, r3);
 
     if (!ReturnTrueFalseObject()) {
-      __ mov(r0, Operand(Smi::FromInt(1)));
+      __ LoadSmiLiteral(r3, Smi::FromInt(1));
     }
   }
   __ Ret(HasArgsInRegisters() ? 0 : 2);
 
   Label object_not_null, object_not_null_or_smi;
   __ bind(&not_js_object);
   // Before null, smi and string value checks, check that the rhs is a function
   // as for a non-function rhs an exception needs to be thrown.
   __ JumpIfSmi(function, &slow);
-  __ CompareObjectType(function, scratch2, scratch, JS_FUNCTION_TYPE);
-  __ b(ne, &slow);
+  __ CompareObjectType(function, scratch3, scratch, JS_FUNCTION_TYPE);
+  __ bne(&slow);
 
   // Null is not instance of anything.
-  __ cmp(scratch, Operand(isolate()->factory()->null_value()));
-  __ b(ne, &object_not_null);
+  __ Cmpi(scratch, Operand(isolate()->factory()->null_value()), r0);
+  __ bne(&object_not_null);
   if (ReturnTrueFalseObject()) {
-    __ Move(r0, factory->false_value());
+    __ Move(r3, factory->false_value());
   } else {
-    __ mov(r0, Operand(Smi::FromInt(1)));
+    __ LoadSmiLiteral(r3, Smi::FromInt(1));
   }
   __ Ret(HasArgsInRegisters() ? 0 : 2);
 
   __ bind(&object_not_null);
   // Smi values are not instances of anything.
   __ JumpIfNotSmi(object, &object_not_null_or_smi);
   if (ReturnTrueFalseObject()) {
-    __ Move(r0, factory->false_value());
+    __ Move(r3, factory->false_value());
   } else {
-    __ mov(r0, Operand(Smi::FromInt(1)));
+    __ LoadSmiLiteral(r3, Smi::FromInt(1));
   }
   __ Ret(HasArgsInRegisters() ? 0 : 2);
 
   __ bind(&object_not_null_or_smi);
   // String values are not instances of anything.
   __ IsObjectJSStringType(object, scratch, &slow);
   if (ReturnTrueFalseObject()) {
-    __ Move(r0, factory->false_value());
+    __ Move(r3, factory->false_value());
   } else {
-    __ mov(r0, Operand(Smi::FromInt(1)));
+    __ LoadSmiLiteral(r3, Smi::FromInt(1));
   }
   __ Ret(HasArgsInRegisters() ? 0 : 2);
 
   // Slow-case.  Tail call builtin.
   __ bind(&slow);
   if (!ReturnTrueFalseObject()) {
     if (HasArgsInRegisters()) {
-      __ Push(r0, r1);
+      __ Push(r3, r4);
     }
-  __ InvokeBuiltin(Builtins::INSTANCE_OF, JUMP_FUNCTION);
+    __ InvokeBuiltin(Builtins::INSTANCE_OF, JUMP_FUNCTION);
   } else {
     {
       FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
-      __ Push(r0, r1);
+      __ Push(r3, r4);
       __ InvokeBuiltin(Builtins::INSTANCE_OF, CALL_FUNCTION);
     }
-    __ cmp(r0, Operand::Zero());
-    __ LoadRoot(r0, Heap::kTrueValueRootIndex, eq);
-    __ LoadRoot(r0, Heap::kFalseValueRootIndex, ne);
+    Label true_value, done;
+    __ cmpi(r3, Operand::Zero());
+    __ beq(&true_value);
+
+    __ LoadRoot(r3, Heap::kFalseValueRootIndex);
+    __ b(&done);
+
+    __ bind(&true_value);
+    __ LoadRoot(r3, Heap::kTrueValueRootIndex);
+
+    __ bind(&done);
     __ Ret(HasArgsInRegisters() ? 0 : 2);
   }
 }
 
 
 void FunctionPrototypeStub::Generate(MacroAssembler* masm) {
   Label miss;
   Register receiver = LoadDescriptor::ReceiverRegister();
 
-  NamedLoadHandlerCompiler::GenerateLoadFunctionPrototype(masm, receiver, r3,
-                                                          r4, &miss);
+  NamedLoadHandlerCompiler::GenerateLoadFunctionPrototype(masm, receiver, r6,
+                                                          r7, &miss);
   __ bind(&miss);
   PropertyAccessCompiler::TailCallBuiltin(
       masm, PropertyAccessCompiler::MissBuiltin(Code::LOAD_IC));
 }
 
 
 void ArgumentsAccessStub::GenerateReadElement(MacroAssembler* masm) {
   // The displacement is the offset of the last parameter (if any)
   // relative to the frame pointer.
   const int kDisplacement =
       StandardFrameConstants::kCallerSPOffset - kPointerSize;
-  DCHECK(r1.is(ArgumentsAccessReadDescriptor::index()));
-  DCHECK(r0.is(ArgumentsAccessReadDescriptor::parameter_count()));
+  DCHECK(r4.is(ArgumentsAccessReadDescriptor::index()));
+  DCHECK(r3.is(ArgumentsAccessReadDescriptor::parameter_count()));
 
   // Check that the key is a smi.
   Label slow;
-  __ JumpIfNotSmi(r1, &slow);
+  __ JumpIfNotSmi(r4, &slow);
 
   // Check if the calling frame is an arguments adaptor frame.
   Label adaptor;
-  __ ldr(r2, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
-  __ ldr(r3, MemOperand(r2, StandardFrameConstants::kContextOffset));
-  __ cmp(r3, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
-  __ b(eq, &adaptor);
+  __ LoadP(r5, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
+  __ LoadP(r6, MemOperand(r5, StandardFrameConstants::kContextOffset));
+  STATIC_ASSERT(StackFrame::ARGUMENTS_ADAPTOR < 0x3fffu);
+  __ CmpSmiLiteral(r6, Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR), r0);
+  __ beq(&adaptor);
 
   // Check index against formal parameters count limit passed in
-  // through register r0. Use unsigned comparison to get negative
+  // through register r3. Use unsigned comparison to get negative
   // check for free.
-  __ cmp(r1, r0);
-  __ b(hs, &slow);
+  __ cmpl(r4, r3);
+  __ bge(&slow);
 
   // Read the argument from the stack and return it.
-  __ sub(r3, r0, r1);
-  __ add(r3, fp, Operand::PointerOffsetFromSmiKey(r3));
-  __ ldr(r0, MemOperand(r3, kDisplacement));
-  __ Jump(lr);
+  __ sub(r6, r3, r4);
+  __ SmiToPtrArrayOffset(r6, r6);
+  __ add(r6, fp, r6);
+  __ LoadP(r3, MemOperand(r6, kDisplacement));
+  __ blr();
 
   // Arguments adaptor case: Check index against actual arguments
   // limit found in the arguments adaptor frame. Use unsigned
   // comparison to get negative check for free.
   __ bind(&adaptor);
-  __ ldr(r0, MemOperand(r2, ArgumentsAdaptorFrameConstants::kLengthOffset));
-  __ cmp(r1, r0);
-  __ b(cs, &slow);
+  __ LoadP(r3, MemOperand(r5, ArgumentsAdaptorFrameConstants::kLengthOffset));
+  __ cmpl(r4, r3);
+  __ bge(&slow);
 
   // Read the argument from the adaptor frame and return it.
-  __ sub(r3, r0, r1);
-  __ add(r3, r2, Operand::PointerOffsetFromSmiKey(r3));
-  __ ldr(r0, MemOperand(r3, kDisplacement));
-  __ Jump(lr);
+  __ sub(r6, r3, r4);
+  __ SmiToPtrArrayOffset(r6, r6);
+  __ add(r6, r5, r6);
+  __ LoadP(r3, MemOperand(r6, kDisplacement));
+  __ blr();
 
   // Slow-case: Handle non-smi or out-of-bounds access to arguments
   // by calling the runtime system.
   __ bind(&slow);
-  __ push(r1);
+  __ push(r4);
   __ TailCallRuntime(Runtime::kGetArgumentsProperty, 1, 1);
 }
 
 
 void ArgumentsAccessStub::GenerateNewSloppySlow(MacroAssembler* masm) {
   // sp[0] : number of parameters
-  // sp[4] : receiver displacement
-  // sp[8] : function
+  // sp[1] : receiver displacement
+  // sp[2] : function
 
   // Check if the calling frame is an arguments adaptor frame.
   Label runtime;
-  __ ldr(r3, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
-  __ ldr(r2, MemOperand(r3, StandardFrameConstants::kContextOffset));
-  __ cmp(r2, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
-  __ b(ne, &runtime);
+  __ LoadP(r6, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
+  __ LoadP(r5, MemOperand(r6, StandardFrameConstants::kContextOffset));
+  STATIC_ASSERT(StackFrame::ARGUMENTS_ADAPTOR < 0x3fffu);
+  __ CmpSmiLiteral(r5, Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR), r0);
+  __ bne(&runtime);
 
   // Patch the arguments.length and the parameters pointer in the current frame.
-  __ ldr(r2, MemOperand(r3, ArgumentsAdaptorFrameConstants::kLengthOffset));
-  __ str(r2, MemOperand(sp, 0 * kPointerSize));
-  __ add(r3, r3, Operand(r2, LSL, 1));
-  __ add(r3, r3, Operand(StandardFrameConstants::kCallerSPOffset));
-  __ str(r3, MemOperand(sp, 1 * kPointerSize));
+  __ LoadP(r5, MemOperand(r6, ArgumentsAdaptorFrameConstants::kLengthOffset));
+  __ StoreP(r5, MemOperand(sp, 0 * kPointerSize));
+  __ SmiToPtrArrayOffset(r5, r5);
+  __ add(r6, r6, r5);
+  __ addi(r6, r6, Operand(StandardFrameConstants::kCallerSPOffset));
+  __ StoreP(r6, MemOperand(sp, 1 * kPointerSize));
 
   __ bind(&runtime);
   __ TailCallRuntime(Runtime::kNewSloppyArguments, 3, 1);
 }
 
 
 void ArgumentsAccessStub::GenerateNewSloppyFast(MacroAssembler* masm) {
   // Stack layout:
   //  sp[0] : number of parameters (tagged)
-  //  sp[4] : address of receiver argument
-  //  sp[8] : function
+  //  sp[1] : address of receiver argument
+  //  sp[2] : function
   // Registers used over whole function:
-  //  r6 : allocated object (tagged)
-  //  r9 : mapped parameter count (tagged)
+  //  r9 : allocated object (tagged)
+  //  r11 : mapped parameter count (tagged)
 
-  __ ldr(r1, MemOperand(sp, 0 * kPointerSize));
-  // r1 = parameter count (tagged)
+  __ LoadP(r4, MemOperand(sp, 0 * kPointerSize));
+  // r4 = parameter count (tagged)
 
   // Check if the calling frame is an arguments adaptor frame.
   Label runtime;
   Label adaptor_frame, try_allocate;
-  __ ldr(r3, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
-  __ ldr(r2, MemOperand(r3, StandardFrameConstants::kContextOffset));
-  __ cmp(r2, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
-  __ b(eq, &adaptor_frame);
+  __ LoadP(r6, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
+  __ LoadP(r5, MemOperand(r6, StandardFrameConstants::kContextOffset));
+  STATIC_ASSERT(StackFrame::ARGUMENTS_ADAPTOR < 0x3fffu);
+  __ CmpSmiLiteral(r5, Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR), r0);
+  __ beq(&adaptor_frame);
 
   // No adaptor, parameter count = argument count.
-  __ mov(r2, r1);
+  __ mr(r5, r4);
   __ b(&try_allocate);
 
   // We have an adaptor frame. Patch the parameters pointer.
   __ bind(&adaptor_frame);
-  __ ldr(r2, MemOperand(r3, ArgumentsAdaptorFrameConstants::kLengthOffset));
-  __ add(r3, r3, Operand(r2, LSL, 1));
-  __ add(r3, r3, Operand(StandardFrameConstants::kCallerSPOffset));
-  __ str(r3, MemOperand(sp, 1 * kPointerSize));
+  __ LoadP(r5, MemOperand(r6, ArgumentsAdaptorFrameConstants::kLengthOffset));
+  __ SmiToPtrArrayOffset(r7, r5);
+  __ add(r6, r6, r7);
+  __ addi(r6, r6, Operand(StandardFrameConstants::kCallerSPOffset));
+  __ StoreP(r6, MemOperand(sp, 1 * kPointerSize));
 
-  // r1 = parameter count (tagged)
-  // r2 = argument count (tagged)
-  // Compute the mapped parameter count = min(r1, r2) in r1.
-  __ cmp(r1, Operand(r2));
-  __ mov(r1, Operand(r2), LeaveCC, gt);
+  // r4 = parameter count (tagged)
+  // r5 = argument count (tagged)
+  // Compute the mapped parameter count = min(r4, r5) in r4.
+  Label skip;
+  __ cmp(r4, r5);
+  __ blt(&skip);
+  __ mr(r4, r5);
+  __ bind(&skip);
 
   __ bind(&try_allocate);
 
   // Compute the sizes of backing store, parameter map, and arguments object.
   // 1. Parameter map, has 2 extra words containing context and backing store.
   const int kParameterMapHeaderSize =
       FixedArray::kHeaderSize + 2 * kPointerSize;
   // If there are no mapped parameters, we do not need the parameter_map.
-  __ cmp(r1, Operand(Smi::FromInt(0)));
-  __ mov(r9, Operand::Zero(), LeaveCC, eq);
-  __ mov(r9, Operand(r1, LSL, 1), LeaveCC, ne);
-  __ add(r9, r9, Operand(kParameterMapHeaderSize), LeaveCC, ne);
+  Label skip2, skip3;
+  __ CmpSmiLiteral(r4, Smi::FromInt(0), r0);
+  __ bne(&skip2);
+  __ li(r11, Operand::Zero());
+  __ b(&skip3);
+  __ bind(&skip2);
+  __ SmiToPtrArrayOffset(r11, r4);
+  __ addi(r11, r11, Operand(kParameterMapHeaderSize));
+  __ bind(&skip3);
 
   // 2. Backing store.
-  __ add(r9, r9, Operand(r2, LSL, 1));
-  __ add(r9, r9, Operand(FixedArray::kHeaderSize));
+  __ SmiToPtrArrayOffset(r7, r5);
+  __ add(r11, r11, r7);
+  __ addi(r11, r11, Operand(FixedArray::kHeaderSize));
 
   // 3. Arguments object.
-  __ add(r9, r9, Operand(Heap::kSloppyArgumentsObjectSize));
+  __ addi(r11, r11, Operand(Heap::kSloppyArgumentsObjectSize));
 
   // Do the allocation of all three objects in one go.
-  __ Allocate(r9, r0, r3, r4, &runtime, TAG_OBJECT);
+  __ Allocate(r11, r3, r6, r7, &runtime, TAG_OBJECT);
 
-  // r0 = address of new object(s) (tagged)
-  // r2 = argument count (smi-tagged)
+  // r3 = address of new object(s) (tagged)
+  // r5 = argument count (smi-tagged)
   // Get the arguments boilerplate from the current native context into r4.
   const int kNormalOffset =
       Context::SlotOffset(Context::SLOPPY_ARGUMENTS_MAP_INDEX);
   const int kAliasedOffset =
       Context::SlotOffset(Context::ALIASED_ARGUMENTS_MAP_INDEX);
 
-  __ ldr(r4, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
-  __ ldr(r4, FieldMemOperand(r4, GlobalObject::kNativeContextOffset));
-  __ cmp(r1, Operand::Zero());
-  __ ldr(r4, MemOperand(r4, kNormalOffset), eq);
-  __ ldr(r4, MemOperand(r4, kAliasedOffset), ne);
+  __ LoadP(r7,
+           MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
+  __ LoadP(r7, FieldMemOperand(r7, GlobalObject::kNativeContextOffset));
+  Label skip4, skip5;
+  __ cmpi(r4, Operand::Zero());
+  __ bne(&skip4);
+  __ LoadP(r7, MemOperand(r7, kNormalOffset));
+  __ b(&skip5);
+  __ bind(&skip4);
+  __ LoadP(r7, MemOperand(r7, kAliasedOffset));
+  __ bind(&skip5);
 
-  // r0 = address of new object (tagged)
-  // r1 = mapped parameter count (tagged)
-  // r2 = argument count (smi-tagged)
-  // r4 = address of arguments map (tagged)
-  __ str(r4, FieldMemOperand(r0, JSObject::kMapOffset));
-  __ LoadRoot(r3, Heap::kEmptyFixedArrayRootIndex);
-  __ str(r3, FieldMemOperand(r0, JSObject::kPropertiesOffset));
-  __ str(r3, FieldMemOperand(r0, JSObject::kElementsOffset));
+  // r3 = address of new object (tagged)
+  // r4 = mapped parameter count (tagged)
+  // r5 = argument count (smi-tagged)
+  // r7 = address of arguments map (tagged)
+  __ StoreP(r7, FieldMemOperand(r3, JSObject::kMapOffset), r0);
+  __ LoadRoot(r6, Heap::kEmptyFixedArrayRootIndex);
+  __ StoreP(r6, FieldMemOperand(r3, JSObject::kPropertiesOffset), r0);
+  __ StoreP(r6, FieldMemOperand(r3, JSObject::kElementsOffset), r0);
 
   // Set up the callee in-object property.
   STATIC_ASSERT(Heap::kArgumentsCalleeIndex == 1);
-  __ ldr(r3, MemOperand(sp, 2 * kPointerSize));
-  __ AssertNotSmi(r3);
-  const int kCalleeOffset = JSObject::kHeaderSize +
-      Heap::kArgumentsCalleeIndex * kPointerSize;
-  __ str(r3, FieldMemOperand(r0, kCalleeOffset));
+  __ LoadP(r6, MemOperand(sp, 2 * kPointerSize));
+  __ AssertNotSmi(r6);
+  const int kCalleeOffset =
+      JSObject::kHeaderSize + Heap::kArgumentsCalleeIndex * kPointerSize;
+  __ StoreP(r6, FieldMemOperand(r3, kCalleeOffset), r0);
 
   // Use the length (smi tagged) and set that as an in-object property too.
-  __ AssertSmi(r2);
+  __ AssertSmi(r5);
   STATIC_ASSERT(Heap::kArgumentsLengthIndex == 0);
-  const int kLengthOffset = JSObject::kHeaderSize +
-      Heap::kArgumentsLengthIndex * kPointerSize;
-  __ str(r2, FieldMemOperand(r0, kLengthOffset));
+  const int kLengthOffset =
+      JSObject::kHeaderSize + Heap::kArgumentsLengthIndex * kPointerSize;
+  __ StoreP(r5, FieldMemOperand(r3, kLengthOffset), r0);
 
   // Set up the elements pointer in the allocated arguments object.
-  // If we allocated a parameter map, r4 will point there, otherwise
+  // If we allocated a parameter map, r7 will point there, otherwise
   // it will point to the backing store.
-  __ add(r4, r0, Operand(Heap::kSloppyArgumentsObjectSize));
-  __ str(r4, FieldMemOperand(r0, JSObject::kElementsOffset));
+  __ addi(r7, r3, Operand(Heap::kSloppyArgumentsObjectSize));
+  __ StoreP(r7, FieldMemOperand(r3, JSObject::kElementsOffset), r0);
 
-  // r0 = address of new object (tagged)
-  // r1 = mapped parameter count (tagged)
-  // r2 = argument count (tagged)
-  // r4 = address of parameter map or backing store (tagged)
+  // r3 = address of new object (tagged)
+  // r4 = mapped parameter count (tagged)
+  // r5 = argument count (tagged)
+  // r7 = address of parameter map or backing store (tagged)
   // Initialize parameter map. If there are no mapped arguments, we're done.
-  Label skip_parameter_map;
-  __ cmp(r1, Operand(Smi::FromInt(0)));
-  // Move backing store address to r3, because it is
+  Label skip_parameter_map, skip6;
+  __ CmpSmiLiteral(r4, Smi::FromInt(0), r0);
+  __ bne(&skip6);
+  // Move backing store address to r6, because it is
   // expected there when filling in the unmapped arguments.
-  __ mov(r3, r4, LeaveCC, eq);
-  __ b(eq, &skip_parameter_map);
+  __ mr(r6, r7);
+  __ b(&skip_parameter_map);
+  __ bind(&skip6);
 
-  __ LoadRoot(r6, Heap::kSloppyArgumentsElementsMapRootIndex);
-  __ str(r6, FieldMemOperand(r4, FixedArray::kMapOffset));
-  __ add(r6, r1, Operand(Smi::FromInt(2)));
-  __ str(r6, FieldMemOperand(r4, FixedArray::kLengthOffset));
-  __ str(cp, FieldMemOperand(r4, FixedArray::kHeaderSize + 0 * kPointerSize));
-  __ add(r6, r4, Operand(r1, LSL, 1));
-  __ add(r6, r6, Operand(kParameterMapHeaderSize));
-  __ str(r6, FieldMemOperand(r4, FixedArray::kHeaderSize + 1 * kPointerSize));
+  __ LoadRoot(r9, Heap::kSloppyArgumentsElementsMapRootIndex);
+  __ StoreP(r9, FieldMemOperand(r7, FixedArray::kMapOffset), r0);
+  __ AddSmiLiteral(r9, r4, Smi::FromInt(2), r0);
+  __ StoreP(r9, FieldMemOperand(r7, FixedArray::kLengthOffset), r0);
+  __ StoreP(cp, FieldMemOperand(r7, FixedArray::kHeaderSize + 0 * kPointerSize),
+            r0);
+  __ SmiToPtrArrayOffset(r9, r4);
+  __ add(r9, r7, r9);
+  __ addi(r9, r9, Operand(kParameterMapHeaderSize));
+  __ StoreP(r9, FieldMemOperand(r7, FixedArray::kHeaderSize + 1 * kPointerSize),
+            r0);
 
   // Copy the parameter slots and the holes in the arguments.
   // We need to fill in mapped_parameter_count slots. They index the context,
   // where parameters are stored in reverse order, at
   //   MIN_CONTEXT_SLOTS .. MIN_CONTEXT_SLOTS+parameter_count-1
   // The mapped parameter thus need to get indices
   //   MIN_CONTEXT_SLOTS+parameter_count-1 ..
   //       MIN_CONTEXT_SLOTS+parameter_count-mapped_parameter_count
   // We loop from right to left.
   Label parameters_loop, parameters_test;
-  __ mov(r6, r1);
-  __ ldr(r9, MemOperand(sp, 0 * kPointerSize));
-  __ add(r9, r9, Operand(Smi::FromInt(Context::MIN_CONTEXT_SLOTS)));
-  __ sub(r9, r9, Operand(r1));
-  __ LoadRoot(r5, Heap::kTheHoleValueRootIndex);
-  __ add(r3, r4, Operand(r6, LSL, 1));
-  __ add(r3, r3, Operand(kParameterMapHeaderSize));
+  __ mr(r9, r4);
+  __ LoadP(r11, MemOperand(sp, 0 * kPointerSize));
+  __ AddSmiLiteral(r11, r11, Smi::FromInt(Context::MIN_CONTEXT_SLOTS), r0);
+  __ sub(r11, r11, r4);
+  __ LoadRoot(r10, Heap::kTheHoleValueRootIndex);
+  __ SmiToPtrArrayOffset(r6, r9);
+  __ add(r6, r7, r6);
+  __ addi(r6, r6, Operand(kParameterMapHeaderSize));
 
-  // r6 = loop variable (tagged)
-  // r1 = mapping index (tagged)
-  // r3 = address of backing store (tagged)
-  // r4 = address of parameter map (tagged), which is also the address of new
-  //      object + Heap::kSloppyArgumentsObjectSize (tagged)
-  // r0 = temporary scratch (a.o., for address calculation)
-  // r5 = the hole value
-  __ jmp(&parameters_test);
+  // r9 = loop variable (tagged)
+  // r4 = mapping index (tagged)
+  // r6 = address of backing store (tagged)
+  // r7 = address of parameter map (tagged)
+  // r8 = temporary scratch (a.o., for address calculation)
+  // r10 = the hole value
+  __ b(&parameters_test);
 
   __ bind(&parameters_loop);
-  __ sub(r6, r6, Operand(Smi::FromInt(1)));
-  __ mov(r0, Operand(r6, LSL, 1));
-  __ add(r0, r0, Operand(kParameterMapHeaderSize - kHeapObjectTag));
-  __ str(r9, MemOperand(r4, r0));
-  __ sub(r0, r0, Operand(kParameterMapHeaderSize - FixedArray::kHeaderSize));
-  __ str(r5, MemOperand(r3, r0));
-  __ add(r9, r9, Operand(Smi::FromInt(1)));
+  __ SubSmiLiteral(r9, r9, Smi::FromInt(1), r0);
+  __ SmiToPtrArrayOffset(r8, r9);
+  __ addi(r8, r8, Operand(kParameterMapHeaderSize - kHeapObjectTag));
+  __ StorePX(r11, MemOperand(r8, r7));
+  __ subi(r8, r8, Operand(kParameterMapHeaderSize - FixedArray::kHeaderSize));
+  __ StorePX(r10, MemOperand(r8, r6));
+  __ AddSmiLiteral(r11, r11, Smi::FromInt(1), r0);
   __ bind(&parameters_test);
-  __ cmp(r6, Operand(Smi::FromInt(0)));
-  __ b(ne, &parameters_loop);
-
-  // Restore r0 = new object (tagged)
-  __ sub(r0, r4, Operand(Heap::kSloppyArgumentsObjectSize));
+  __ CmpSmiLiteral(r9, Smi::FromInt(0), r0);
+  __ bne(&parameters_loop);
 
   __ bind(&skip_parameter_map);
-  // r0 = address of new object (tagged)
-  // r2 = argument count (tagged)
-  // r3 = address of backing store (tagged)
-  // r5 = scratch
+  // r5 = argument count (tagged)
+  // r6 = address of backing store (tagged)
+  // r8 = scratch
   // Copy arguments header and remaining slots (if there are any).
-  __ LoadRoot(r5, Heap::kFixedArrayMapRootIndex);
-  __ str(r5, FieldMemOperand(r3, FixedArray::kMapOffset));
-  __ str(r2, FieldMemOperand(r3, FixedArray::kLengthOffset));
+  __ LoadRoot(r8, Heap::kFixedArrayMapRootIndex);
+  __ StoreP(r8, FieldMemOperand(r6, FixedArray::kMapOffset), r0);
+  __ StoreP(r5, FieldMemOperand(r6, FixedArray::kLengthOffset), r0);
 
   Label arguments_loop, arguments_test;
-  __ mov(r9, r1);
-  __ ldr(r4, MemOperand(sp, 1 * kPointerSize));
-  __ sub(r4, r4, Operand(r9, LSL, 1));
-  __ jmp(&arguments_test);
+  __ mr(r11, r4);
+  __ LoadP(r7, MemOperand(sp, 1 * kPointerSize));
+  __ SmiToPtrArrayOffset(r8, r11);
+  __ sub(r7, r7, r8);
+  __ b(&arguments_test);
 
   __ bind(&arguments_loop);
-  __ sub(r4, r4, Operand(kPointerSize));
-  __ ldr(r6, MemOperand(r4, 0));
-  __ add(r5, r3, Operand(r9, LSL, 1));
-  __ str(r6, FieldMemOperand(r5, FixedArray::kHeaderSize));
-  __ add(r9, r9, Operand(Smi::FromInt(1)));
+  __ subi(r7, r7, Operand(kPointerSize));
+  __ LoadP(r9, MemOperand(r7, 0));
+  __ SmiToPtrArrayOffset(r8, r11);
+  __ add(r8, r6, r8);
+  __ StoreP(r9, FieldMemOperand(r8, FixedArray::kHeaderSize), r0);
+  __ AddSmiLiteral(r11, r11, Smi::FromInt(1), r0);
 
   __ bind(&arguments_test);
-  __ cmp(r9, Operand(r2));
-  __ b(lt, &arguments_loop);
+  __ cmp(r11, r5);
+  __ blt(&arguments_loop);
 
   // Return and remove the on-stack parameters.
-  __ add(sp, sp, Operand(3 * kPointerSize));
+  __ addi(sp, sp, Operand(3 * kPointerSize));
   __ Ret();
 
   // Do the runtime call to allocate the arguments object.
-  // r0 = address of new object (tagged)
-  // r2 = argument count (tagged)
+  // r5 = argument count (tagged)
   __ bind(&runtime);
-  __ str(r2, MemOperand(sp, 0 * kPointerSize));  // Patch argument count.
+  __ StoreP(r5, MemOperand(sp, 0 * kPointerSize));  // Patch argument count.
   __ TailCallRuntime(Runtime::kNewSloppyArguments, 3, 1);
 }
 
 
 void LoadIndexedInterceptorStub::Generate(MacroAssembler* masm) {
   // Return address is in lr.
   Label slow;
 
   Register receiver = LoadDescriptor::ReceiverRegister();
   Register key = LoadDescriptor::NameRegister();
 
   // Check that the key is an array index, that is Uint32.
-  __ NonNegativeSmiTst(key);
-  __ b(ne, &slow);
+  __ TestIfPositiveSmi(key, r0);
+  __ bne(&slow, cr0);
 
   // Everything is fine, call runtime.
   __ Push(receiver, key);  // Receiver, key.
 
   // Perform tail call to the entry.
   __ TailCallExternalReference(
       ExternalReference(IC_Utility(IC::kLoadElementWithInterceptor),
                         masm->isolate()),
       2, 1);
 
   __ bind(&slow);
   PropertyAccessCompiler::TailCallBuiltin(
       masm, PropertyAccessCompiler::MissBuiltin(Code::KEYED_LOAD_IC));
 }
 
 
 void ArgumentsAccessStub::GenerateNewStrict(MacroAssembler* masm) {
   // sp[0] : number of parameters
   // sp[4] : receiver displacement
   // sp[8] : function
   // Check if the calling frame is an arguments adaptor frame.
   Label adaptor_frame, try_allocate, runtime;
-  __ ldr(r2, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
-  __ ldr(r3, MemOperand(r2, StandardFrameConstants::kContextOffset));
-  __ cmp(r3, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
-  __ b(eq, &adaptor_frame);
+  __ LoadP(r5, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
+  __ LoadP(r6, MemOperand(r5, StandardFrameConstants::kContextOffset));
+  STATIC_ASSERT(StackFrame::ARGUMENTS_ADAPTOR < 0x3fffu);
+  __ CmpSmiLiteral(r6, Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR), r0);
+  __ beq(&adaptor_frame);
 
   // Get the length from the frame.
-  __ ldr(r1, MemOperand(sp, 0));
+  __ LoadP(r4, MemOperand(sp, 0));
   __ b(&try_allocate);
 
   // Patch the arguments.length and the parameters pointer.
   __ bind(&adaptor_frame);
-  __ ldr(r1, MemOperand(r2, ArgumentsAdaptorFrameConstants::kLengthOffset));
-  __ str(r1, MemOperand(sp, 0));
-  __ add(r3, r2, Operand::PointerOffsetFromSmiKey(r1));
-  __ add(r3, r3, Operand(StandardFrameConstants::kCallerSPOffset));
-  __ str(r3, MemOperand(sp, 1 * kPointerSize));
+  __ LoadP(r4, MemOperand(r5, ArgumentsAdaptorFrameConstants::kLengthOffset));
+  __ StoreP(r4, MemOperand(sp, 0));
+  __ SmiToPtrArrayOffset(r6, r4);
+  __ add(r6, r5, r6);
+  __ addi(r6, r6, Operand(StandardFrameConstants::kCallerSPOffset));
+  __ StoreP(r6, MemOperand(sp, 1 * kPointerSize));
 
   // Try the new space allocation. Start out with computing the size
   // of the arguments object and the elements array in words.
   Label add_arguments_object;
   __ bind(&try_allocate);
-  __ SmiUntag(r1, SetCC);
-  __ b(eq, &add_arguments_object);
-  __ add(r1, r1, Operand(FixedArray::kHeaderSize / kPointerSize));
+  __ cmpi(r4, Operand::Zero());
+  __ beq(&add_arguments_object);
+  __ SmiUntag(r4);
+  __ addi(r4, r4, Operand(FixedArray::kHeaderSize / kPointerSize));
   __ bind(&add_arguments_object);
-  __ add(r1, r1, Operand(Heap::kStrictArgumentsObjectSize / kPointerSize));
+  __ addi(r4, r4, Operand(Heap::kStrictArgumentsObjectSize / kPointerSize));
 
   // Do the allocation of both objects in one go.
-  __ Allocate(r1, r0, r2, r3, &runtime,
+  __ Allocate(r4, r3, r5, r6, &runtime,
               static_cast<AllocationFlags>(TAG_OBJECT | SIZE_IN_WORDS));
 
   // Get the arguments boilerplate from the current native context.
-  __ ldr(r4, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
-  __ ldr(r4, FieldMemOperand(r4, GlobalObject::kNativeContextOffset));
-  __ ldr(r4, MemOperand(
-                 r4, Context::SlotOffset(Context::STRICT_ARGUMENTS_MAP_INDEX)));
+  __ LoadP(r7,
+           MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
+  __ LoadP(r7, FieldMemOperand(r7, GlobalObject::kNativeContextOffset));
+  __ LoadP(
+      r7,
+      MemOperand(r7, Context::SlotOffset(Context::STRICT_ARGUMENTS_MAP_INDEX)));
 
-  __ str(r4, FieldMemOperand(r0, JSObject::kMapOffset));
-  __ LoadRoot(r3, Heap::kEmptyFixedArrayRootIndex);
-  __ str(r3, FieldMemOperand(r0, JSObject::kPropertiesOffset));
-  __ str(r3, FieldMemOperand(r0, JSObject::kElementsOffset));
+  __ StoreP(r7, FieldMemOperand(r3, JSObject::kMapOffset), r0);
+  __ LoadRoot(r6, Heap::kEmptyFixedArrayRootIndex);
+  __ StoreP(r6, FieldMemOperand(r3, JSObject::kPropertiesOffset), r0);
+  __ StoreP(r6, FieldMemOperand(r3, JSObject::kElementsOffset), r0);
 
   // Get the length (smi tagged) and set that as an in-object property too.
   STATIC_ASSERT(Heap::kArgumentsLengthIndex == 0);
-  __ ldr(r1, MemOperand(sp, 0 * kPointerSize));
-  __ AssertSmi(r1);
-  __ str(r1, FieldMemOperand(r0, JSObject::kHeaderSize +
-      Heap::kArgumentsLengthIndex * kPointerSize));
+  __ LoadP(r4, MemOperand(sp, 0 * kPointerSize));
+  __ AssertSmi(r4);
+  __ StoreP(r4,
+            FieldMemOperand(r3, JSObject::kHeaderSize +
+                                    Heap::kArgumentsLengthIndex * kPointerSize),
+            r0);
 
   // If there are no actual arguments, we're done.
   Label done;
-  __ cmp(r1, Operand::Zero());
-  __ b(eq, &done);
+  __ cmpi(r4, Operand::Zero());
+  __ beq(&done);
 
   // Get the parameters pointer from the stack.
-  __ ldr(r2, MemOperand(sp, 1 * kPointerSize));
+  __ LoadP(r5, MemOperand(sp, 1 * kPointerSize));
 
   // Set up the elements pointer in the allocated arguments object and
   // initialize the header in the elements fixed array.
-  __ add(r4, r0, Operand(Heap::kStrictArgumentsObjectSize));
-  __ str(r4, FieldMemOperand(r0, JSObject::kElementsOffset));
-  __ LoadRoot(r3, Heap::kFixedArrayMapRootIndex);
-  __ str(r3, FieldMemOperand(r4, FixedArray::kMapOffset));
-  __ str(r1, FieldMemOperand(r4, FixedArray::kLengthOffset));
-  __ SmiUntag(r1);
+  __ addi(r7, r3, Operand(Heap::kStrictArgumentsObjectSize));
+  __ StoreP(r7, FieldMemOperand(r3, JSObject::kElementsOffset), r0);
+  __ LoadRoot(r6, Heap::kFixedArrayMapRootIndex);
+  __ StoreP(r6, FieldMemOperand(r7, FixedArray::kMapOffset), r0);
+  __ StoreP(r4, FieldMemOperand(r7, FixedArray::kLengthOffset), r0);
+  // Untag the length for the loop.
+  __ SmiUntag(r4);
 
   // Copy the fixed array slots.
   Label loop;
-  // Set up r4 to point to the first array slot.
-  __ add(r4, r4, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
+  // Set up r7 to point just prior to the first array slot.
+  __ addi(r7, r7,
+          Operand(FixedArray::kHeaderSize - kHeapObjectTag - kPointerSize));
+  __ mtctr(r4);
   __ bind(&loop);
-  // Pre-decrement r2 with kPointerSize on each iteration.
+  // Pre-decrement r5 with kPointerSize on each iteration.
   // Pre-decrement in order to skip receiver.
-  __ ldr(r3, MemOperand(r2, kPointerSize, NegPreIndex));
-  // Post-increment r4 with kPointerSize on each iteration.
-  __ str(r3, MemOperand(r4, kPointerSize, PostIndex));
-  __ sub(r1, r1, Operand(1));
-  __ cmp(r1, Operand::Zero());
-  __ b(ne, &loop);
+  __ LoadPU(r6, MemOperand(r5, -kPointerSize));
+  // Pre-increment r7 with kPointerSize on each iteration.
+  __ StorePU(r6, MemOperand(r7, kPointerSize));
+  __ bdnz(&loop);
 
   // Return and remove the on-stack parameters.
   __ bind(&done);
-  __ add(sp, sp, Operand(3 * kPointerSize));
+  __ addi(sp, sp, Operand(3 * kPointerSize));
   __ Ret();
 
   // Do the runtime call to allocate the arguments object.
   __ bind(&runtime);
   __ TailCallRuntime(Runtime::kNewStrictArguments, 3, 1);
 }
 
 
 void RegExpExecStub::Generate(MacroAssembler* masm) {
-  // Just jump directly to runtime if native RegExp is not selected at compile
-  // time or if regexp entry in generated code is turned off runtime switch or
-  // at compilation.
+// Just jump directly to runtime if native RegExp is not selected at compile
+// time or if regexp entry in generated code is turned off runtime switch or
+// at compilation.
 #ifdef V8_INTERPRETED_REGEXP
   __ TailCallRuntime(Runtime::kRegExpExecRT, 4, 1);
 #else  // V8_INTERPRETED_REGEXP
 
   // Stack frame on entry.
   //  sp[0]: last_match_info (expected JSArray)
   //  sp[4]: previous index
   //  sp[8]: subject string
   //  sp[12]: JSRegExp object
 
   const int kLastMatchInfoOffset = 0 * kPointerSize;
   const int kPreviousIndexOffset = 1 * kPointerSize;
   const int kSubjectOffset = 2 * kPointerSize;
   const int kJSRegExpOffset = 3 * kPointerSize;
 
-  Label runtime;
+  Label runtime, br_over, encoding_type_UC16;
+
   // Allocation of registers for this function. These are in callee save
   // registers and will be preserved by the call to the native RegExp code, as
   // this code is called using the normal C calling convention. When calling
   // directly from generated code the native RegExp code will not do a GC and
   // therefore the content of these registers are safe to use after the call.
-  Register subject = r4;
-  Register regexp_data = r5;
-  Register last_match_info_elements = no_reg;  // will be r6;
+  Register subject = r14;
+  Register regexp_data = r15;
+  Register last_match_info_elements = r16;
+  Register code = r17;
+
+  // Ensure register assigments are consistent with callee save masks
+  DCHECK(subject.bit() & kCalleeSaved);
+  DCHECK(regexp_data.bit() & kCalleeSaved);
+  DCHECK(last_match_info_elements.bit() & kCalleeSaved);
+  DCHECK(code.bit() & kCalleeSaved);
 
   // Ensure that a RegExp stack is allocated.
   ExternalReference address_of_regexp_stack_memory_address =
       ExternalReference::address_of_regexp_stack_memory_address(isolate());
   ExternalReference address_of_regexp_stack_memory_size =
       ExternalReference::address_of_regexp_stack_memory_size(isolate());
-  __ mov(r0, Operand(address_of_regexp_stack_memory_size));
-  __ ldr(r0, MemOperand(r0, 0));
-  __ cmp(r0, Operand::Zero());
-  __ b(eq, &runtime);
+  __ mov(r3, Operand(address_of_regexp_stack_memory_size));
+  __ LoadP(r3, MemOperand(r3, 0));
+  __ cmpi(r3, Operand::Zero());
+  __ beq(&runtime);
 
   // Check that the first argument is a JSRegExp object.
-  __ ldr(r0, MemOperand(sp, kJSRegExpOffset));
-  __ JumpIfSmi(r0, &runtime);
-  __ CompareObjectType(r0, r1, r1, JS_REGEXP_TYPE);
-  __ b(ne, &runtime);
+  __ LoadP(r3, MemOperand(sp, kJSRegExpOffset));
+  __ JumpIfSmi(r3, &runtime);
+  __ CompareObjectType(r3, r4, r4, JS_REGEXP_TYPE);
+  __ bne(&runtime);
 
   // Check that the RegExp has been compiled (data contains a fixed array).
-  __ ldr(regexp_data, FieldMemOperand(r0, JSRegExp::kDataOffset));
+  __ LoadP(regexp_data, FieldMemOperand(r3, JSRegExp::kDataOffset));
   if (FLAG_debug_code) {
-    __ SmiTst(regexp_data);
-    __ Check(ne, kUnexpectedTypeForRegExpDataFixedArrayExpected);
-    __ CompareObjectType(regexp_data, r0, r0, FIXED_ARRAY_TYPE);
+    __ TestIfSmi(regexp_data, r0);
+    __ Check(ne, kUnexpectedTypeForRegExpDataFixedArrayExpected, cr0);
+    __ CompareObjectType(regexp_data, r3, r3, FIXED_ARRAY_TYPE);
     __ Check(eq, kUnexpectedTypeForRegExpDataFixedArrayExpected);
   }
 
   // regexp_data: RegExp data (FixedArray)
   // Check the type of the RegExp. Only continue if type is JSRegExp::IRREGEXP.
-  __ ldr(r0, FieldMemOperand(regexp_data, JSRegExp::kDataTagOffset));
-  __ cmp(r0, Operand(Smi::FromInt(JSRegExp::IRREGEXP)));
-  __ b(ne, &runtime);
+  __ LoadP(r3, FieldMemOperand(regexp_data, JSRegExp::kDataTagOffset));
+  // DCHECK(Smi::FromInt(JSRegExp::IRREGEXP) < (char *)0xffffu);
+  __ CmpSmiLiteral(r3, Smi::FromInt(JSRegExp::IRREGEXP), r0);
+  __ bne(&runtime);
 
   // regexp_data: RegExp data (FixedArray)
   // Check that the number of captures fit in the static offsets vector buffer.
-  __ ldr(r2,
-         FieldMemOperand(regexp_data, JSRegExp::kIrregexpCaptureCountOffset));
+  __ LoadP(r5,
+           FieldMemOperand(regexp_data, JSRegExp::kIrregexpCaptureCountOffset));
   // Check (number_of_captures + 1) * 2 <= offsets vector size
   // Or          number_of_captures * 2 <= offsets vector size - 2
-  // Multiplying by 2 comes for free since r2 is smi-tagged.
-  STATIC_ASSERT(kSmiTag == 0);
-  STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 1);
+  // SmiToShortArrayOffset accomplishes the multiplication by 2 and
+  // SmiUntag (which is a nop for 32-bit).
+  __ SmiToShortArrayOffset(r5, r5);
   STATIC_ASSERT(Isolate::kJSRegexpStaticOffsetsVectorSize >= 2);
-  __ cmp(r2, Operand(Isolate::kJSRegexpStaticOffsetsVectorSize - 2));
-  __ b(hi, &runtime);
+  __ cmpli(r5, Operand(Isolate::kJSRegexpStaticOffsetsVectorSize - 2));
+  __ bgt(&runtime);
 
   // Reset offset for possibly sliced string.
-  __ mov(r9, Operand::Zero());
-  __ ldr(subject, MemOperand(sp, kSubjectOffset));
+  __ li(r11, Operand::Zero());
+  __ LoadP(subject, MemOperand(sp, kSubjectOffset));
   __ JumpIfSmi(subject, &runtime);
-  __ mov(r3, subject);  // Make a copy of the original subject string.
-  __ ldr(r0, FieldMemOperand(subject, HeapObject::kMapOffset));
-  __ ldrb(r0, FieldMemOperand(r0, Map::kInstanceTypeOffset));
+  __ mr(r6, subject);  // Make a copy of the original subject string.
+  __ LoadP(r3, FieldMemOperand(subject, HeapObject::kMapOffset));
+  __ lbz(r3, FieldMemOperand(r3, Map::kInstanceTypeOffset));
   // subject: subject string
-  // r3: subject string
-  // r0: subject string instance type
+  // r6: subject string
+  // r3: subject string instance type
   // regexp_data: RegExp data (FixedArray)
   // Handle subject string according to its encoding and representation:
   // (1) Sequential string?  If yes, go to (5).
   // (2) Anything but sequential or cons?  If yes, go to (6).
   // (3) Cons string.  If the string is flat, replace subject with first string.
   //     Otherwise bailout.
   // (4) Is subject external?  If yes, go to (7).
   // (5) Sequential string.  Load regexp code according to encoding.
   // (E) Carry on.
   /// [...]
 
   // Deferred code at the end of the stub:
   // (6) Not a long external string?  If yes, go to (8).
   // (7) External string.  Make it, offset-wise, look like a sequential string.
   //     Go to (5).
   // (8) Short external string or not a string?  If yes, bail out to runtime.
   // (9) Sliced string.  Replace subject with parent.  Go to (4).
 
-  Label seq_string /* 5 */, external_string /* 7 */,
-        check_underlying /* 4 */, not_seq_nor_cons /* 6 */,
-        not_long_external /* 8 */;
+  Label seq_string /* 5 */, external_string /* 7 */, check_underlying /* 4 */,
+      not_seq_nor_cons /* 6 */, not_long_external /* 8 */;
 
   // (1) Sequential string?  If yes, go to (5).
-  __ and_(r1,
-          r0,
-          Operand(kIsNotStringMask |
-                  kStringRepresentationMask |
-                  kShortExternalStringMask),
-          SetCC);
+  STATIC_ASSERT((kIsNotStringMask | kStringRepresentationMask |
+                 kShortExternalStringMask) == 0x93);
+  __ andi(r4, r3, Operand(kIsNotStringMask | kStringRepresentationMask |
+                          kShortExternalStringMask));
   STATIC_ASSERT((kStringTag | kSeqStringTag) == 0);
-  __ b(eq, &seq_string);  // Go to (5).
+  __ beq(&seq_string, cr0);  // Go to (5).
 
   // (2) Anything but sequential or cons?  If yes, go to (6).
   STATIC_ASSERT(kConsStringTag < kExternalStringTag);
   STATIC_ASSERT(kSlicedStringTag > kExternalStringTag);
   STATIC_ASSERT(kIsNotStringMask > kExternalStringTag);
   STATIC_ASSERT(kShortExternalStringTag > kExternalStringTag);
-  __ cmp(r1, Operand(kExternalStringTag));
-  __ b(ge, &not_seq_nor_cons);  // Go to (6).
+  STATIC_ASSERT(kExternalStringTag < 0xffffu);
+  __ cmpi(r4, Operand(kExternalStringTag));
+  __ bge(&not_seq_nor_cons);  // Go to (6).
 
   // (3) Cons string.  Check that it's flat.
   // Replace subject with first string and reload instance type.
-  __ ldr(r0, FieldMemOperand(subject, ConsString::kSecondOffset));
-  __ CompareRoot(r0, Heap::kempty_stringRootIndex);
-  __ b(ne, &runtime);
-  __ ldr(subject, FieldMemOperand(subject, ConsString::kFirstOffset));
+  __ LoadP(r3, FieldMemOperand(subject, ConsString::kSecondOffset));
+  __ CompareRoot(r3, Heap::kempty_stringRootIndex);
+  __ bne(&runtime);
+  __ LoadP(subject, FieldMemOperand(subject, ConsString::kFirstOffset));
 
   // (4) Is subject external?  If yes, go to (7).
   __ bind(&check_underlying);
-  __ ldr(r0, FieldMemOperand(subject, HeapObject::kMapOffset));
-  __ ldrb(r0, FieldMemOperand(r0, Map::kInstanceTypeOffset));
+  __ LoadP(r3, FieldMemOperand(subject, HeapObject::kMapOffset));
+  __ lbz(r3, FieldMemOperand(r3, Map::kInstanceTypeOffset));
   STATIC_ASSERT(kSeqStringTag == 0);
-  __ tst(r0, Operand(kStringRepresentationMask));
+  STATIC_ASSERT(kStringRepresentationMask == 3);
+  __ andi(r0, r3, Operand(kStringRepresentationMask));
   // The underlying external string is never a short external string.
   STATIC_ASSERT(ExternalString::kMaxShortLength < ConsString::kMinLength);
   STATIC_ASSERT(ExternalString::kMaxShortLength < SlicedString::kMinLength);
-  __ b(ne, &external_string);  // Go to (7).
+  __ bne(&external_string, cr0);  // Go to (7).
 
   // (5) Sequential string.  Load regexp code according to encoding.
   __ bind(&seq_string);
   // subject: sequential subject string (or look-alike, external string)
-  // r3: original subject string
-  // Load previous index and check range before r3 is overwritten.  We have to
-  // use r3 instead of subject here because subject might have been only made
+  // r6: original subject string
+  // Load previous index and check range before r6 is overwritten.  We have to
+  // use r6 instead of subject here because subject might have been only made
   // to look like a sequential string when it actually is an external string.
-  __ ldr(r1, MemOperand(sp, kPreviousIndexOffset));
-  __ JumpIfNotSmi(r1, &runtime);
-  __ ldr(r3, FieldMemOperand(r3, String::kLengthOffset));
-  __ cmp(r3, Operand(r1));
-  __ b(ls, &runtime);
-  __ SmiUntag(r1);
+  __ LoadP(r4, MemOperand(sp, kPreviousIndexOffset));
+  __ JumpIfNotSmi(r4, &runtime);
+  __ LoadP(r6, FieldMemOperand(r6, String::kLengthOffset));
+  __ cmpl(r6, r4);
+  __ ble(&runtime);
+  __ SmiUntag(r4);
 
   STATIC_ASSERT(4 == kOneByteStringTag);
   STATIC_ASSERT(kTwoByteStringTag == 0);
-  __ and_(r0, r0, Operand(kStringEncodingMask));
-  __ mov(r3, Operand(r0, ASR, 2), SetCC);
-  __ ldr(r6, FieldMemOperand(regexp_data, JSRegExp::kDataOneByteCodeOffset),
-         ne);
-  __ ldr(r6, FieldMemOperand(regexp_data, JSRegExp::kDataUC16CodeOffset), eq);
+  STATIC_ASSERT(kStringEncodingMask == 4);
+  __ ExtractBitMask(r6, r3, kStringEncodingMask, SetRC);
+  __ beq(&encoding_type_UC16, cr0);
+  __ LoadP(code,
+           FieldMemOperand(regexp_data, JSRegExp::kDataOneByteCodeOffset));
+  __ b(&br_over);
+  __ bind(&encoding_type_UC16);
+  __ LoadP(code, FieldMemOperand(regexp_data, JSRegExp::kDataUC16CodeOffset));
+  __ bind(&br_over);
 
   // (E) Carry on.  String handling is done.
-  // r6: irregexp code
+  // code: irregexp code
   // Check that the irregexp code has been generated for the actual string
   // encoding. If it has, the field contains a code object otherwise it contains
   // a smi (code flushing support).
-  __ JumpIfSmi(r6, &runtime);
-
-  // r1: previous index
-  // r3: encoding of subject string (1 if one_byte, 0 if two_byte);
-  // r6: code
+  __ JumpIfSmi(code, &runtime);
+
+  // r4: previous index
+  // r6: encoding of subject string (1 if one_byte, 0 if two_byte);
+  // code: Address of generated regexp code
   // subject: Subject string
   // regexp_data: RegExp data (FixedArray)
   // All checks done. Now push arguments for native regexp code.
-  __ IncrementCounter(isolate()->counters()->regexp_entry_native(), 1, r0, r2);
+  __ IncrementCounter(isolate()->counters()->regexp_entry_native(), 1, r3, r5);
 
   // Isolates: note we add an additional parameter here (isolate pointer).
-  const int kRegExpExecuteArguments = 9;
-  const int kParameterRegisters = 4;
+  const int kRegExpExecuteArguments = 10;
+  const int kParameterRegisters = 8;
   __ EnterExitFrame(false, kRegExpExecuteArguments - kParameterRegisters);
 
   // Stack pointer now points to cell where return address is to be written.
   // Arguments are before that on the stack or in registers.
 
-  // Argument 9 (sp[20]): Pass current isolate address.
-  __ mov(r0, Operand(ExternalReference::isolate_address(isolate())));
-  __ str(r0, MemOperand(sp, 5 * kPointerSize));
-
-  // Argument 8 (sp[16]): Indicate that this is a direct call from JavaScript.
-  __ mov(r0, Operand(1));
-  __ str(r0, MemOperand(sp, 4 * kPointerSize));
-
-  // Argument 7 (sp[12]): Start (high end) of backtracking stack memory area.
-  __ mov(r0, Operand(address_of_regexp_stack_memory_address));
-  __ ldr(r0, MemOperand(r0, 0));
-  __ mov(r2, Operand(address_of_regexp_stack_memory_size));
-  __ ldr(r2, MemOperand(r2, 0));
-  __ add(r0, r0, Operand(r2));
-  __ str(r0, MemOperand(sp, 3 * kPointerSize));
-
-  // Argument 6: Set the number of capture registers to zero to force global
-  // regexps to behave as non-global.  This does not affect non-global regexps.
-  __ mov(r0, Operand::Zero());
-  __ str(r0, MemOperand(sp, 2 * kPointerSize));
-
-  // Argument 5 (sp[4]): static offsets vector buffer.
-  __ mov(r0,
-         Operand(ExternalReference::address_of_static_offsets_vector(
-             isolate())));
-  __ str(r0, MemOperand(sp, 1 * kPointerSize));
-
-  // For arguments 4 and 3 get string length, calculate start of string data and
-  // calculate the shift of the index (0 for one-byte and 1 for two-byte).
-  __ add(r7, subject, Operand(SeqString::kHeaderSize - kHeapObjectTag));
-  __ eor(r3, r3, Operand(1));
+  // Argument 10 (in stack parameter area): Pass current isolate address.
+  __ mov(r3, Operand(ExternalReference::isolate_address(isolate())));
+  __ StoreP(r3, MemOperand(sp, (kStackFrameExtraParamSlot + 1) * kPointerSize));
+
+  // Argument 9 is a dummy that reserves the space used for
+  // the return address added by the ExitFrame in native calls.
+
+  // Argument 8 (r10): Indicate that this is a direct call from JavaScript.
+  __ li(r10, Operand(1));
+
+  // Argument 7 (r9): Start (high end) of backtracking stack memory area.
+  __ mov(r3, Operand(address_of_regexp_stack_memory_address));
+  __ LoadP(r3, MemOperand(r3, 0));
+  __ mov(r5, Operand(address_of_regexp_stack_memory_size));
+  __ LoadP(r5, MemOperand(r5, 0));
+  __ add(r9, r3, r5);
+
+  // Argument 6 (r8): Set the number of capture registers to zero to force
+  // global egexps to behave as non-global.  This does not affect non-global
+  // regexps.
+  __ li(r8, Operand::Zero());
+
+  // Argument 5 (r7): static offsets vector buffer.
+  __ mov(
+      r7,
+      Operand(ExternalReference::address_of_static_offsets_vector(isolate())));
+
+  // For arguments 4 (r6) and 3 (r5) get string length, calculate start of data
+  // and calculate the shift of the index (0 for one-byte and 1 for two-byte).
+  __ addi(r18, subject, Operand(SeqString::kHeaderSize - kHeapObjectTag));
+  __ xori(r6, r6, Operand(1));
   // Load the length from the original subject string from the previous stack
   // frame. Therefore we have to use fp, which points exactly to two pointer
   // sizes below the previous sp. (Because creating a new stack frame pushes
   // the previous fp onto the stack and moves up sp by 2 * kPointerSize.)
-  __ ldr(subject, MemOperand(fp, kSubjectOffset + 2 * kPointerSize));
+  __ LoadP(subject, MemOperand(fp, kSubjectOffset + 2 * kPointerSize));
   // If slice offset is not 0, load the length from the original sliced string.
-  // Argument 4, r3: End of string data
-  // Argument 3, r2: Start of string data
+  // Argument 4, r6: End of string data
+  // Argument 3, r5: Start of string data
   // Prepare start and end index of the input.
-  __ add(r9, r7, Operand(r9, LSL, r3));
-  __ add(r2, r9, Operand(r1, LSL, r3));
-
-  __ ldr(r7, FieldMemOperand(subject, String::kLengthOffset));
-  __ SmiUntag(r7);
-  __ add(r3, r9, Operand(r7, LSL, r3));
-
-  // Argument 2 (r1): Previous index.
+  __ ShiftLeft_(r11, r11, r6);
+  __ add(r11, r18, r11);
+  __ ShiftLeft_(r5, r4, r6);
+  __ add(r5, r11, r5);
+
+  __ LoadP(r18, FieldMemOperand(subject, String::kLengthOffset));
+  __ SmiUntag(r18);
+  __ ShiftLeft_(r6, r18, r6);
+  __ add(r6, r11, r6);
+
+  // Argument 2 (r4): Previous index.
   // Already there
 
-  // Argument 1 (r0): Subject string.
-  __ mov(r0, subject);
+  // Argument 1 (r3): Subject string.
+  __ mr(r3, subject);
 
   // Locate the code entry and call it.
-  __ add(r6, r6, Operand(Code::kHeaderSize - kHeapObjectTag));
+  __ addi(code, code, Operand(Code::kHeaderSize - kHeapObjectTag));
+
+
+#if ABI_USES_FUNCTION_DESCRIPTORS && defined(USE_SIMULATOR)
+  // Even Simulated AIX/PPC64 Linux uses a function descriptor for the
+  // RegExp routine.  Extract the instruction address here since
+  // DirectCEntryStub::GenerateCall will not do it for calls out to
+  // what it thinks is C code compiled for the simulator/host
+  // platform.
+  __ LoadP(code, MemOperand(code, 0));  // Instruction address
+#endif
+
   DirectCEntryStub stub(isolate());
-  stub.GenerateCall(masm, r6);
+  stub.GenerateCall(masm, code);
 
   __ LeaveExitFrame(false, no_reg, true);
 
-  last_match_info_elements = r6;
-
-  // r0: result
+  // r3: result
   // subject: subject string (callee saved)
   // regexp_data: RegExp data (callee saved)
   // last_match_info_elements: Last match info elements (callee saved)
   // Check the result.
   Label success;
-  __ cmp(r0, Operand(1));
+  __ cmpi(r3, Operand(1));
   // We expect exactly one result since we force the called regexp to behave
   // as non-global.
-  __ b(eq, &success);
+  __ beq(&success);
   Label failure;
-  __ cmp(r0, Operand(NativeRegExpMacroAssembler::FAILURE));
-  __ b(eq, &failure);
-  __ cmp(r0, Operand(NativeRegExpMacroAssembler::EXCEPTION));
+  __ cmpi(r3, Operand(NativeRegExpMacroAssembler::FAILURE));
+  __ beq(&failure);
+  __ cmpi(r3, Operand(NativeRegExpMacroAssembler::EXCEPTION));
   // If not exception it can only be retry. Handle that in the runtime system.
-  __ b(ne, &runtime);
+  __ bne(&runtime);
   // Result must now be exception. If there is no pending exception already a
   // stack overflow (on the backtrack stack) was detected in RegExp code but
   // haven't created the exception yet. Handle that in the runtime system.
   // TODO(592): Rerunning the RegExp to get the stack overflow exception.
-  __ mov(r1, Operand(isolate()->factory()->the_hole_value()));
-  __ mov(r2, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
+  __ mov(r4, Operand(isolate()->factory()->the_hole_value()));
+  __ mov(r5, Operand(ExternalReference(Isolate::kPendingExceptionAddress,
                                        isolate())));
-  __ ldr(r0, MemOperand(r2, 0));
-  __ cmp(r0, r1);
-  __ b(eq, &runtime);
-
-  __ str(r1, MemOperand(r2, 0));  // Clear pending exception.
+  __ LoadP(r3, MemOperand(r5, 0));
+  __ cmp(r3, r4);
+  __ beq(&runtime);
+
+  __ StoreP(r4, MemOperand(r5, 0));  // Clear pending exception.
 
   // Check if the exception is a termination. If so, throw as uncatchable.
-  __ CompareRoot(r0, Heap::kTerminationExceptionRootIndex);
+  __ CompareRoot(r3, Heap::kTerminationExceptionRootIndex);
 
   Label termination_exception;
-  __ b(eq, &termination_exception);
-
-  __ Throw(r0);
+  __ beq(&termination_exception);
+
+  __ Throw(r3);
 
   __ bind(&termination_exception);
-  __ ThrowUncatchable(r0);
+  __ ThrowUncatchable(r3);
 
   __ bind(&failure);
   // For failure and exception return null.
-  __ mov(r0, Operand(isolate()->factory()->null_value()));
-  __ add(sp, sp, Operand(4 * kPointerSize));
+  __ mov(r3, Operand(isolate()->factory()->null_value()));
+  __ addi(sp, sp, Operand(4 * kPointerSize));
   __ Ret();
 
   // Process the result from the native regexp code.
   __ bind(&success);
-  __ ldr(r1,
-         FieldMemOperand(regexp_data, JSRegExp::kIrregexpCaptureCountOffset));
+  __ LoadP(r4,
+           FieldMemOperand(regexp_data, JSRegExp::kIrregexpCaptureCountOffset));
   // Calculate number of capture registers (number_of_captures + 1) * 2.
-  // Multiplying by 2 comes for free since r1 is smi-tagged.
-  STATIC_ASSERT(kSmiTag == 0);
-  STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 1);
-  __ add(r1, r1, Operand(2));  // r1 was a smi.
-
-  __ ldr(r0, MemOperand(sp, kLastMatchInfoOffset));
-  __ JumpIfSmi(r0, &runtime);
-  __ CompareObjectType(r0, r2, r2, JS_ARRAY_TYPE);
-  __ b(ne, &runtime);
+  // SmiToShortArrayOffset accomplishes the multiplication by 2 and
+  // SmiUntag (which is a nop for 32-bit).
+  __ SmiToShortArrayOffset(r4, r4);
+  __ addi(r4, r4, Operand(2));
+
+  __ LoadP(r3, MemOperand(sp, kLastMatchInfoOffset));
+  __ JumpIfSmi(r3, &runtime);
+  __ CompareObjectType(r3, r5, r5, JS_ARRAY_TYPE);
+  __ bne(&runtime);
   // Check that the JSArray is in fast case.
-  __ ldr(last_match_info_elements,
-         FieldMemOperand(r0, JSArray::kElementsOffset));
-  __ ldr(r0, FieldMemOperand(last_match_info_elements, HeapObject::kMapOffset));
-  __ CompareRoot(r0, Heap::kFixedArrayMapRootIndex);
-  __ b(ne, &runtime);
+  __ LoadP(last_match_info_elements,
+           FieldMemOperand(r3, JSArray::kElementsOffset));
+  __ LoadP(r3,
+           FieldMemOperand(last_match_info_elements, HeapObject::kMapOffset));
+  __ CompareRoot(r3, Heap::kFixedArrayMapRootIndex);
+  __ bne(&runtime);
   // Check that the last match info has space for the capture registers and the
   // additional information.
-  __ ldr(r0,
-         FieldMemOperand(last_match_info_elements, FixedArray::kLengthOffset));
-  __ add(r2, r1, Operand(RegExpImpl::kLastMatchOverhead));
-  __ cmp(r2, Operand::SmiUntag(r0));
-  __ b(gt, &runtime);
-
-  // r1: number of capture registers
-  // r4: subject string
+  __ LoadP(
+      r3, FieldMemOperand(last_match_info_elements, FixedArray::kLengthOffset));
+  __ addi(r5, r4, Operand(RegExpImpl::kLastMatchOverhead));
+  __ SmiUntag(r0, r3);
+  __ cmp(r5, r0);
+  __ bgt(&runtime);
+
+  // r4: number of capture registers
+  // subject: subject string
   // Store the capture count.
-  __ SmiTag(r2, r1);
-  __ str(r2, FieldMemOperand(last_match_info_elements,
-                             RegExpImpl::kLastCaptureCountOffset));
+  __ SmiTag(r5, r4);
+  __ StoreP(r5, FieldMemOperand(last_match_info_elements,
+                                RegExpImpl::kLastCaptureCountOffset),
+            r0);
   // Store last subject and last input.
-  __ str(subject,
-         FieldMemOperand(last_match_info_elements,
-                         RegExpImpl::kLastSubjectOffset));
-  __ mov(r2, subject);
-  __ RecordWriteField(last_match_info_elements,
-                      RegExpImpl::kLastSubjectOffset,
-                      subject,
-                      r3,
-                      kLRHasNotBeenSaved,
-                      kDontSaveFPRegs);
-  __ mov(subject, r2);
-  __ str(subject,
-         FieldMemOperand(last_match_info_elements,
-                         RegExpImpl::kLastInputOffset));
-  __ RecordWriteField(last_match_info_elements,
-                      RegExpImpl::kLastInputOffset,
-                      subject,
-                      r3,
-                      kLRHasNotBeenSaved,
-                      kDontSaveFPRegs);
+  __ StoreP(subject, FieldMemOperand(last_match_info_elements,
+                                     RegExpImpl::kLastSubjectOffset),
+            r0);
+  __ mr(r5, subject);
+  __ RecordWriteField(last_match_info_elements, RegExpImpl::kLastSubjectOffset,
+                      subject, r10, kLRHasNotBeenSaved, kDontSaveFPRegs);
+  __ mr(subject, r5);
+  __ StoreP(subject, FieldMemOperand(last_match_info_elements,
+                                     RegExpImpl::kLastInputOffset),
+            r0);
+  __ RecordWriteField(last_match_info_elements, RegExpImpl::kLastInputOffset,
+                      subject, r10, kLRHasNotBeenSaved, kDontSaveFPRegs);
 
   // Get the static offsets vector filled by the native regexp code.
   ExternalReference address_of_static_offsets_vector =
       ExternalReference::address_of_static_offsets_vector(isolate());
-  __ mov(r2, Operand(address_of_static_offsets_vector));
-
-  // r1: number of capture registers
-  // r2: offsets vector
-  Label next_capture, done;
+  __ mov(r5, Operand(address_of_static_offsets_vector));
+
+  // r4: number of capture registers
+  // r5: offsets vector
+  Label next_capture;
   // Capture register counter starts from number of capture registers and
   // counts down until wraping after zero.
-  __ add(r0,
-         last_match_info_elements,
-         Operand(RegExpImpl::kFirstCaptureOffset - kHeapObjectTag));
+  __ addi(
+      r3, last_match_info_elements,
+      Operand(RegExpImpl::kFirstCaptureOffset - kHeapObjectTag - kPointerSize));
+  __ addi(r5, r5, Operand(-kIntSize));  // bias down for lwzu
+  __ mtctr(r4);
   __ bind(&next_capture);
-  __ sub(r1, r1, Operand(1), SetCC);
-  __ b(mi, &done);
   // Read the value from the static offsets vector buffer.
-  __ ldr(r3, MemOperand(r2, kPointerSize, PostIndex));
+  __ lwzu(r6, MemOperand(r5, kIntSize));
   // Store the smi value in the last match info.
-  __ SmiTag(r3);
-  __ str(r3, MemOperand(r0, kPointerSize, PostIndex));
-  __ jmp(&next_capture);
-  __ bind(&done);
+  __ SmiTag(r6);
+  __ StorePU(r6, MemOperand(r3, kPointerSize));
+  __ bdnz(&next_capture);
 
   // Return last match info.
-  __ ldr(r0, MemOperand(sp, kLastMatchInfoOffset));
-  __ add(sp, sp, Operand(4 * kPointerSize));
+  __ LoadP(r3, MemOperand(sp, kLastMatchInfoOffset));
+  __ addi(sp, sp, Operand(4 * kPointerSize));
   __ Ret();
 
   // Do the runtime call to execute the regexp.
   __ bind(&runtime);
   __ TailCallRuntime(Runtime::kRegExpExecRT, 4, 1);
 
   // Deferred code for string handling.
   // (6) Not a long external string?  If yes, go to (8).
   __ bind(&not_seq_nor_cons);
   // Compare flags are still set.
-  __ b(gt, &not_long_external);  // Go to (8).
+  __ bgt(&not_long_external);  // Go to (8).
 
   // (7) External string.  Make it, offset-wise, look like a sequential string.
   __ bind(&external_string);
-  __ ldr(r0, FieldMemOperand(subject, HeapObject::kMapOffset));
-  __ ldrb(r0, FieldMemOperand(r0, Map::kInstanceTypeOffset));
+  __ LoadP(r3, FieldMemOperand(subject, HeapObject::kMapOffset));
+  __ lbz(r3, FieldMemOperand(r3, Map::kInstanceTypeOffset));
   if (FLAG_debug_code) {
     // Assert that we do not have a cons or slice (indirect strings) here.
     // Sequential strings have already been ruled out.
-    __ tst(r0, Operand(kIsIndirectStringMask));
-    __ Assert(eq, kExternalStringExpectedButNotFound);
+    STATIC_ASSERT(kIsIndirectStringMask == 1);
+    __ andi(r0, r3, Operand(kIsIndirectStringMask));
+    __ Assert(eq, kExternalStringExpectedButNotFound, cr0);
   }
-  __ ldr(subject,
-         FieldMemOperand(subject, ExternalString::kResourceDataOffset));
+  __ LoadP(subject,
+           FieldMemOperand(subject, ExternalString::kResourceDataOffset));
   // Move the pointer so that offset-wise, it looks like a sequential string.
   STATIC_ASSERT(SeqTwoByteString::kHeaderSize == SeqOneByteString::kHeaderSize);
-  __ sub(subject,
-         subject,
-         Operand(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
-  __ jmp(&seq_string);    // Go to (5).
+  __ subi(subject, subject,
+          Operand(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
+  __ b(&seq_string);  // Go to (5).
 
   // (8) Short external string or not a string?  If yes, bail out to runtime.
   __ bind(&not_long_external);
-  STATIC_ASSERT(kNotStringTag != 0 && kShortExternalStringTag !=0);
-  __ tst(r1, Operand(kIsNotStringMask | kShortExternalStringMask));
-  __ b(ne, &runtime);
+  STATIC_ASSERT(kNotStringTag != 0 && kShortExternalStringTag != 0);
+  __ andi(r0, r4, Operand(kIsNotStringMask | kShortExternalStringMask));
+  __ bne(&runtime, cr0);
 
   // (9) Sliced string.  Replace subject with parent.  Go to (4).
-  // Load offset into r9 and replace subject string with parent.
-  __ ldr(r9, FieldMemOperand(subject, SlicedString::kOffsetOffset));
-  __ SmiUntag(r9);
-  __ ldr(subject, FieldMemOperand(subject, SlicedString::kParentOffset));
-  __ jmp(&check_underlying);  // Go to (4).
+  // Load offset into r11 and replace subject string with parent.
+  __ LoadP(r11, FieldMemOperand(subject, SlicedString::kOffsetOffset));
+  __ SmiUntag(r11);
+  __ LoadP(subject, FieldMemOperand(subject, SlicedString::kParentOffset));
+  __ b(&check_underlying);  // Go to (4).
 #endif  // V8_INTERPRETED_REGEXP
 }
 
 
 static void GenerateRecordCallTarget(MacroAssembler* masm) {
   // Cache the called function in a feedback vector slot.  Cache states
   // are uninitialized, monomorphic (indicated by a JSFunction), and
   // megamorphic.
-  // r0 : number of arguments to the construct function
-  // r1 : the function to call
-  // r2 : Feedback vector
-  // r3 : slot in feedback vector (Smi)
+  // r3 : number of arguments to the construct function
+  // r4 : the function to call
+  // r5 : Feedback vector
+  // r6 : slot in feedback vector (Smi)
   Label initialize, done, miss, megamorphic, not_array_function;
 
   DCHECK_EQ(*TypeFeedbackVector::MegamorphicSentinel(masm->isolate()),
             masm->isolate()->heap()->megamorphic_symbol());
   DCHECK_EQ(*TypeFeedbackVector::UninitializedSentinel(masm->isolate()),
             masm->isolate()->heap()->uninitialized_symbol());
 
-  // Load the cache state into r4.
-  __ add(r4, r2, Operand::PointerOffsetFromSmiKey(r3));
-  __ ldr(r4, FieldMemOperand(r4, FixedArray::kHeaderSize));
+  // Load the cache state into r7.
+  __ SmiToPtrArrayOffset(r7, r6);
+  __ add(r7, r5, r7);
+  __ LoadP(r7, FieldMemOperand(r7, FixedArray::kHeaderSize));
 
   // A monomorphic cache hit or an already megamorphic state: invoke the
   // function without changing the state.
-  __ cmp(r4, r1);
+  __ cmp(r7, r4);
   __ b(eq, &done);
 
   if (!FLAG_pretenuring_call_new) {
     // If we came here, we need to see if we are the array function.
     // If we didn't have a matching function, and we didn't find the megamorph
     // sentinel, then we have in the slot either some other function or an
     // AllocationSite. Do a map check on the object in ecx.
-    __ ldr(r5, FieldMemOperand(r4, 0));
-    __ CompareRoot(r5, Heap::kAllocationSiteMapRootIndex);
-    __ b(ne, &miss);
+    __ LoadP(r8, FieldMemOperand(r7, 0));
+    __ CompareRoot(r8, Heap::kAllocationSiteMapRootIndex);
+    __ bne(&miss);
 
     // Make sure the function is the Array() function
-    __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, r4);
-    __ cmp(r1, r4);
-    __ b(ne, &megamorphic);
-    __ jmp(&done);
+    __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, r7);
+    __ cmp(r4, r7);
+    __ bne(&megamorphic);
+    __ b(&done);
   }
 
   __ bind(&miss);
 
   // A monomorphic miss (i.e, here the cache is not uninitialized) goes
   // megamorphic.
-  __ CompareRoot(r4, Heap::kUninitializedSymbolRootIndex);
-  __ b(eq, &initialize);
+  __ CompareRoot(r7, Heap::kuninitialized_symbolRootIndex);
+  __ beq(&initialize);
   // MegamorphicSentinel is an immortal immovable object (undefined) so no
   // write-barrier is needed.
   __ bind(&megamorphic);
-  __ add(r4, r2, Operand::PointerOffsetFromSmiKey(r3));
-  __ LoadRoot(ip, Heap::kMegamorphicSymbolRootIndex);
-  __ str(ip, FieldMemOperand(r4, FixedArray::kHeaderSize));
+  __ SmiToPtrArrayOffset(r7, r6);
+  __ add(r7, r5, r7);
+  __ LoadRoot(ip, Heap::kmegamorphic_symbolRootIndex);
+  __ StoreP(ip, FieldMemOperand(r7, FixedArray::kHeaderSize), r0);
   __ jmp(&done);
 
   // An uninitialized cache is patched with the function
   __ bind(&initialize);
 
   if (!FLAG_pretenuring_call_new) {
-    // Make sure the function is the Array() function
-    __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, r4);
-    __ cmp(r1, r4);
-    __ b(ne, &not_array_function);
+    // Make sure the function is the Array() function.
+    __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, r7);
+    __ cmp(r4, r7);
+    __ bne(&not_array_function);
 
     // The target function is the Array constructor,
     // Create an AllocationSite if we don't already have it, store it in the
     // slot.
     {
       FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
 
       // Arguments register must be smi-tagged to call out.
-      __ SmiTag(r0);
-      __ Push(r3, r2, r1, r0);
+      __ SmiTag(r3);
+      __ Push(r6, r5, r4, r3);
 
       CreateAllocationSiteStub create_stub(masm->isolate());
       __ CallStub(&create_stub);
 
-      __ Pop(r3, r2, r1, r0);
-      __ SmiUntag(r0);
+      __ Pop(r6, r5, r4, r3);
+      __ SmiUntag(r3);
     }
     __ b(&done);
 
     __ bind(&not_array_function);
   }
 
-  __ add(r4, r2, Operand::PointerOffsetFromSmiKey(r3));
-  __ add(r4, r4, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
-  __ str(r1, MemOperand(r4, 0));
+  __ SmiToPtrArrayOffset(r7, r6);
+  __ add(r7, r5, r7);
+  __ addi(r7, r7, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
+  __ StoreP(r4, MemOperand(r7, 0));
 
-  __ Push(r4, r2, r1);
-  __ RecordWrite(r2, r4, r1, kLRHasNotBeenSaved, kDontSaveFPRegs,
+  __ Push(r7, r5, r4);
+  __ RecordWrite(r5, r7, r4, kLRHasNotBeenSaved, kDontSaveFPRegs,
                  EMIT_REMEMBERED_SET, OMIT_SMI_CHECK);
-  __ Pop(r4, r2, r1);
+  __ Pop(r7, r5, r4);
 
   __ bind(&done);
 }
 
 
 static void EmitContinueIfStrictOrNative(MacroAssembler* masm, Label* cont) {
-  // Do not transform the receiver for strict mode functions.
-  __ ldr(r3, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
-  __ ldr(r4, FieldMemOperand(r3, SharedFunctionInfo::kCompilerHintsOffset));
-  __ tst(r4, Operand(1 << (SharedFunctionInfo::kStrictModeFunction +
-                           kSmiTagSize)));
-  __ b(ne, cont);
+  // Do not transform the receiver for strict mode functions and natives.
+  __ LoadP(r6, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
+  __ lwz(r7, FieldMemOperand(r6, SharedFunctionInfo::kCompilerHintsOffset));
+  __ TestBit(r7,
+#if V8_TARGET_ARCH_PPC64
+             SharedFunctionInfo::kStrictModeFunction,
+#else
+             SharedFunctionInfo::kStrictModeFunction + kSmiTagSize,
+#endif
+             r0);
+  __ bne(cont, cr0);
 
-  // Do not transform the receiver for native (Compilerhints already in r3).
-  __ tst(r4, Operand(1 << (SharedFunctionInfo::kNative + kSmiTagSize)));
-  __ b(ne, cont);
+  // Do not transform the receiver for native.
+  __ TestBit(r7,
+#if V8_TARGET_ARCH_PPC64
+             SharedFunctionInfo::kNative,
+#else
+             SharedFunctionInfo::kNative + kSmiTagSize,
+#endif
+             r0);
+  __ bne(cont, cr0);
 }
 
 
-static void EmitSlowCase(MacroAssembler* masm,
-                         int argc,
-                         Label* non_function) {
+static void EmitSlowCase(MacroAssembler* masm, int argc, Label* non_function) {
   // Check for function proxy.
-  __ cmp(r4, Operand(JS_FUNCTION_PROXY_TYPE));
-  __ b(ne, non_function);
-  __ push(r1);  // put proxy as additional argument
-  __ mov(r0, Operand(argc + 1, RelocInfo::NONE32));
-  __ mov(r2, Operand::Zero());
-  __ GetBuiltinFunction(r1, Builtins::CALL_FUNCTION_PROXY);
+  STATIC_ASSERT(JS_FUNCTION_PROXY_TYPE < 0xffffu);
+  __ cmpi(r7, Operand(JS_FUNCTION_PROXY_TYPE));
+  __ bne(non_function);
+  __ push(r4);  // put proxy as additional argument
+  __ li(r3, Operand(argc + 1));
+  __ li(r5, Operand::Zero());
+  __ GetBuiltinFunction(r4, Builtins::CALL_FUNCTION_PROXY);
   {
     Handle<Code> adaptor =
         masm->isolate()->builtins()->ArgumentsAdaptorTrampoline();
     __ Jump(adaptor, RelocInfo::CODE_TARGET);
   }
 
   // CALL_NON_FUNCTION expects the non-function callee as receiver (instead
   // of the original receiver from the call site).
   __ bind(non_function);
-  __ str(r1, MemOperand(sp, argc * kPointerSize));
-  __ mov(r0, Operand(argc));  // Set up the number of arguments.
-  __ mov(r2, Operand::Zero());
-  __ GetBuiltinFunction(r1, Builtins::CALL_NON_FUNCTION);
+  __ StoreP(r4, MemOperand(sp, argc * kPointerSize), r0);
+  __ li(r3, Operand(argc));  // Set up the number of arguments.
+  __ li(r5, Operand::Zero());
+  __ GetBuiltinFunction(r4, Builtins::CALL_NON_FUNCTION);
   __ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
           RelocInfo::CODE_TARGET);
 }
 
 
 static void EmitWrapCase(MacroAssembler* masm, int argc, Label* cont) {
   // Wrap the receiver and patch it back onto the stack.
-  { FrameAndConstantPoolScope frame_scope(masm, StackFrame::INTERNAL);
-    __ Push(r1, r3);
+  {
+    FrameAndConstantPoolScope frame_scope(masm, StackFrame::INTERNAL);
+    __ Push(r4, r6);
     __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
-    __ pop(r1);
+    __ pop(r4);
   }
-  __ str(r0, MemOperand(sp, argc * kPointerSize));
-  __ jmp(cont);
+  __ StoreP(r3, MemOperand(sp, argc * kPointerSize), r0);
+  __ b(cont);
 }
 
 
-static void CallFunctionNoFeedback(MacroAssembler* masm,
-                                   int argc, bool needs_checks,
-                                   bool call_as_method) {
-  // r1 : the function to call
+static void CallFunctionNoFeedback(MacroAssembler* masm, int argc,
+                                   bool needs_checks, bool call_as_method) {
+  // r4 : the function to call
   Label slow, non_function, wrap, cont;
 
   if (needs_checks) {
     // Check that the function is really a JavaScript function.
-    // r1: pushed function (to be verified)
-    __ JumpIfSmi(r1, &non_function);
+    // r4: pushed function (to be verified)
+    __ JumpIfSmi(r4, &non_function);
 
     // Goto slow case if we do not have a function.
-    __ CompareObjectType(r1, r4, r4, JS_FUNCTION_TYPE);
-    __ b(ne, &slow);
+    __ CompareObjectType(r4, r7, r7, JS_FUNCTION_TYPE);
+    __ bne(&slow);
   }
 
   // Fast-case: Invoke the function now.
-  // r1: pushed function
+  // r4: pushed function
   ParameterCount actual(argc);
 
   if (call_as_method) {
     if (needs_checks) {
       EmitContinueIfStrictOrNative(masm, &cont);
     }
 
     // Compute the receiver in sloppy mode.
-    __ ldr(r3, MemOperand(sp, argc * kPointerSize));
+    __ LoadP(r6, MemOperand(sp, argc * kPointerSize), r0);
 
     if (needs_checks) {
-      __ JumpIfSmi(r3, &wrap);
-      __ CompareObjectType(r3, r4, r4, FIRST_SPEC_OBJECT_TYPE);
-      __ b(lt, &wrap);
+      __ JumpIfSmi(r6, &wrap);
+      __ CompareObjectType(r6, r7, r7, FIRST_SPEC_OBJECT_TYPE);
+      __ blt(&wrap);
     } else {
-      __ jmp(&wrap);
+      __ b(&wrap);
     }
 
     __ bind(&cont);
   }
 
-  __ InvokeFunction(r1, actual, JUMP_FUNCTION, NullCallWrapper());
+  __ InvokeFunction(r4, actual, JUMP_FUNCTION, NullCallWrapper());
 
   if (needs_checks) {
     // Slow-case: Non-function called.
     __ bind(&slow);
     EmitSlowCase(masm, argc, &non_function);
   }
 
   if (call_as_method) {
     __ bind(&wrap);
     EmitWrapCase(masm, argc, &cont);
   }
 }
 
 
 void CallFunctionStub::Generate(MacroAssembler* masm) {
   CallFunctionNoFeedback(masm, argc(), NeedsChecks(), CallAsMethod());
 }
 
 
 void CallConstructStub::Generate(MacroAssembler* masm) {
-  // r0 : number of arguments
-  // r1 : the function to call
-  // r2 : feedback vector
-  // r3 : (only if r2 is not the megamorphic symbol) slot in feedback
+  // r3 : number of arguments
+  // r4 : the function to call
+  // r5 : feedback vector
+  // r6 : (only if r5 is not the megamorphic symbol) slot in feedback
   //      vector (Smi)
   Label slow, non_function_call;
 
   // Check that the function is not a smi.
-  __ JumpIfSmi(r1, &non_function_call);
+  __ JumpIfSmi(r4, &non_function_call);
   // Check that the function is a JSFunction.
-  __ CompareObjectType(r1, r4, r4, JS_FUNCTION_TYPE);
-  __ b(ne, &slow);
+  __ CompareObjectType(r4, r7, r7, JS_FUNCTION_TYPE);
+  __ bne(&slow);
 
   if (RecordCallTarget()) {
     GenerateRecordCallTarget(masm);
 
-    __ add(r5, r2, Operand::PointerOffsetFromSmiKey(r3));
+    __ SmiToPtrArrayOffset(r8, r6);
+    __ add(r8, r5, r8);
     if (FLAG_pretenuring_call_new) {
-      // Put the AllocationSite from the feedback vector into r2.
+      // Put the AllocationSite from the feedback vector into r5.
       // By adding kPointerSize we encode that we know the AllocationSite
-      // entry is at the feedback vector slot given by r3 + 1.
-      __ ldr(r2, FieldMemOperand(r5, FixedArray::kHeaderSize + kPointerSize));
+      // entry is at the feedback vector slot given by r6 + 1.
+      __ LoadP(r5, FieldMemOperand(r8, FixedArray::kHeaderSize + kPointerSize));
     } else {
       Label feedback_register_initialized;
-      // Put the AllocationSite from the feedback vector into r2, or undefined.
-      __ ldr(r2, FieldMemOperand(r5, FixedArray::kHeaderSize));
-      __ ldr(r5, FieldMemOperand(r2, AllocationSite::kMapOffset));
-      __ CompareRoot(r5, Heap::kAllocationSiteMapRootIndex);
-      __ b(eq, &feedback_register_initialized);
-      __ LoadRoot(r2, Heap::kUndefinedValueRootIndex);
+      // Put the AllocationSite from the feedback vector into r5, or undefined.
+      __ LoadP(r5, FieldMemOperand(r8, FixedArray::kHeaderSize));
+      __ LoadP(r8, FieldMemOperand(r5, AllocationSite::kMapOffset));
+      __ CompareRoot(r8, Heap::kAllocationSiteMapRootIndex);
+      __ beq(&feedback_register_initialized);
+      __ LoadRoot(r5, Heap::kUndefinedValueRootIndex);
       __ bind(&feedback_register_initialized);
     }
 
-    __ AssertUndefinedOrAllocationSite(r2, r5);
+    __ AssertUndefinedOrAllocationSite(r5, r8);
   }
 
   // Jump to the function-specific construct stub.
-  Register jmp_reg = r4;
-  __ ldr(jmp_reg, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
-  __ ldr(jmp_reg, FieldMemOperand(jmp_reg,
-                                  SharedFunctionInfo::kConstructStubOffset));
-  __ add(pc, jmp_reg, Operand(Code::kHeaderSize - kHeapObjectTag));
+  Register jmp_reg = r7;
+  __ LoadP(jmp_reg, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
+  __ LoadP(jmp_reg,
+           FieldMemOperand(jmp_reg, SharedFunctionInfo::kConstructStubOffset));
+  __ addi(ip, jmp_reg, Operand(Code::kHeaderSize - kHeapObjectTag));
+  __ JumpToJSEntry(ip);
 
-  // r0: number of arguments
-  // r1: called object
-  // r4: object type
+  // r3: number of arguments
+  // r4: called object
+  // r7: object type
   Label do_call;
   __ bind(&slow);
-  __ cmp(r4, Operand(JS_FUNCTION_PROXY_TYPE));
-  __ b(ne, &non_function_call);
-  __ GetBuiltinFunction(r1, Builtins::CALL_FUNCTION_PROXY_AS_CONSTRUCTOR);
-  __ jmp(&do_call);
+  STATIC_ASSERT(JS_FUNCTION_PROXY_TYPE < 0xffffu);
+  __ cmpi(r7, Operand(JS_FUNCTION_PROXY_TYPE));
+  __ bne(&non_function_call);
+  __ GetBuiltinFunction(r4, Builtins::CALL_FUNCTION_PROXY_AS_CONSTRUCTOR);
+  __ b(&do_call);
 
   __ bind(&non_function_call);
-  __ GetBuiltinFunction(r1, Builtins::CALL_NON_FUNCTION_AS_CONSTRUCTOR);
+  __ GetBuiltinFunction(r4, Builtins::CALL_NON_FUNCTION_AS_CONSTRUCTOR);
   __ bind(&do_call);
-  // Set expected number of arguments to zero (not changing r0).
-  __ mov(r2, Operand::Zero());
+  // Set expected number of arguments to zero (not changing r3).
+  __ li(r5, Operand::Zero());
   __ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
           RelocInfo::CODE_TARGET);
 }
 
 
 static void EmitLoadTypeFeedbackVector(MacroAssembler* masm, Register vector) {
-  __ ldr(vector, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
-  __ ldr(vector, FieldMemOperand(vector,
-                                 JSFunction::kSharedFunctionInfoOffset));
-  __ ldr(vector, FieldMemOperand(vector,
-                                 SharedFunctionInfo::kFeedbackVectorOffset));
+  __ LoadP(vector, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+  __ LoadP(vector,
+           FieldMemOperand(vector, JSFunction::kSharedFunctionInfoOffset));
+  __ LoadP(vector,
+           FieldMemOperand(vector, SharedFunctionInfo::kFeedbackVectorOffset));
 }
 
 
 void CallIC_ArrayStub::Generate(MacroAssembler* masm) {
-  // r1 - function
-  // r3 - slot id
+  // r4 - function
+  // r6 - slot id
   Label miss;
   int argc = arg_count();
   ParameterCount actual(argc);
 
-  EmitLoadTypeFeedbackVector(masm, r2);
+  EmitLoadTypeFeedbackVector(masm, r5);
 
-  __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, r4);
-  __ cmp(r1, r4);
-  __ b(ne, &miss);
+  __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, r7);
+  __ cmp(r4, r7);
+  __ bne(&miss);
 
-  __ mov(r0, Operand(arg_count()));
-  __ add(r4, r2, Operand::PointerOffsetFromSmiKey(r3));
-  __ ldr(r4, FieldMemOperand(r4, FixedArray::kHeaderSize));
+  __ mov(r3, Operand(arg_count()));
+  __ SmiToPtrArrayOffset(r7, r6);
+  __ add(r7, r5, r7);
+  __ LoadP(r7, FieldMemOperand(r7, FixedArray::kHeaderSize));
 
-  // Verify that r4 contains an AllocationSite
-  __ ldr(r5, FieldMemOperand(r4, HeapObject::kMapOffset));
-  __ CompareRoot(r5, Heap::kAllocationSiteMapRootIndex);
-  __ b(ne, &miss);
+  // Verify that r7 contains an AllocationSite
+  __ LoadP(r8, FieldMemOperand(r7, HeapObject::kMapOffset));
+  __ CompareRoot(r8, Heap::kAllocationSiteMapRootIndex);
+  __ bne(&miss);
 
-  __ mov(r2, r4);
+  __ mr(r5, r7);
   ArrayConstructorStub stub(masm->isolate(), arg_count());
   __ TailCallStub(&stub);
 
   __ bind(&miss);
   GenerateMiss(masm);
 
   // The slow case, we need this no matter what to complete a call after a miss.
-  CallFunctionNoFeedback(masm,
-                         arg_count(),
-                         true,
-                         CallAsMethod());
+  CallFunctionNoFeedback(masm, arg_count(), true, CallAsMethod());
 
   // Unreachable.
   __ stop("Unexpected code address");
 }
 
 
 void CallICStub::Generate(MacroAssembler* masm) {
-  // r1 - function
-  // r3 - slot id (Smi)
+  // r4 - function
+  // r6 - slot id (Smi)
   Label extra_checks_or_miss, slow_start;
   Label slow, non_function, wrap, cont;
   Label have_js_function;
   int argc = arg_count();
   ParameterCount actual(argc);
 
-  EmitLoadTypeFeedbackVector(masm, r2);
+  EmitLoadTypeFeedbackVector(masm, r5);
 
-  // The checks. First, does r1 match the recorded monomorphic target?
-  __ add(r4, r2, Operand::PointerOffsetFromSmiKey(r3));
-  __ ldr(r4, FieldMemOperand(r4, FixedArray::kHeaderSize));
-  __ cmp(r1, r4);
-  __ b(ne, &extra_checks_or_miss);
+  // The checks. First, does r4 match the recorded monomorphic target?
+  __ SmiToPtrArrayOffset(r7, r6);
+  __ add(r7, r5, r7);
+  __ LoadP(r7, FieldMemOperand(r7, FixedArray::kHeaderSize));
+  __ cmp(r4, r7);
+  __ bne(&extra_checks_or_miss);
 
   __ bind(&have_js_function);
   if (CallAsMethod()) {
     EmitContinueIfStrictOrNative(masm, &cont);
     // Compute the receiver in sloppy mode.
-    __ ldr(r3, MemOperand(sp, argc * kPointerSize));
+    __ LoadP(r6, MemOperand(sp, argc * kPointerSize), r0);
 
-    __ JumpIfSmi(r3, &wrap);
-    __ CompareObjectType(r3, r4, r4, FIRST_SPEC_OBJECT_TYPE);
-    __ b(lt, &wrap);
+    __ JumpIfSmi(r6, &wrap);
+    __ CompareObjectType(r6, r7, r7, FIRST_SPEC_OBJECT_TYPE);
+    __ blt(&wrap);
 
     __ bind(&cont);
   }
 
-  __ InvokeFunction(r1, actual, JUMP_FUNCTION, NullCallWrapper());
+  __ InvokeFunction(r4, actual, JUMP_FUNCTION, NullCallWrapper());
 
   __ bind(&slow);
   EmitSlowCase(masm, argc, &non_function);
 
   if (CallAsMethod()) {
     __ bind(&wrap);
     EmitWrapCase(masm, argc, &cont);
   }
 
   __ bind(&extra_checks_or_miss);
   Label miss;
 
-  __ CompareRoot(r4, Heap::kMegamorphicSymbolRootIndex);
-  __ b(eq, &slow_start);
-  __ CompareRoot(r4, Heap::kUninitializedSymbolRootIndex);
-  __ b(eq, &miss);
+  __ CompareRoot(r7, Heap::kmegamorphic_symbolRootIndex);
+  __ beq(&slow_start);
+  __ CompareRoot(r7, Heap::kuninitialized_symbolRootIndex);
+  __ beq(&miss);
 
   if (!FLAG_trace_ic) {
     // We are going megamorphic. If the feedback is a JSFunction, it is fine
     // to handle it here. More complex cases are dealt with in the runtime.
-    __ AssertNotSmi(r4);
-    __ CompareObjectType(r4, r5, r5, JS_FUNCTION_TYPE);
-    __ b(ne, &miss);
-    __ add(r4, r2, Operand::PointerOffsetFromSmiKey(r3));
-    __ LoadRoot(ip, Heap::kMegamorphicSymbolRootIndex);
-    __ str(ip, FieldMemOperand(r4, FixedArray::kHeaderSize));
+    __ AssertNotSmi(r7);
+    __ CompareObjectType(r7, r8, r8, JS_FUNCTION_TYPE);
+    __ bne(&miss);
+    __ SmiToPtrArrayOffset(r7, r6);
+    __ add(r7, r5, r7);
+    __ LoadRoot(ip, Heap::kmegamorphic_symbolRootIndex);
+    __ StoreP(ip, FieldMemOperand(r7, FixedArray::kHeaderSize), r0);
     __ jmp(&slow_start);
   }
 
   // We are here because tracing is on or we are going monomorphic.
   __ bind(&miss);
   GenerateMiss(masm);
 
   // the slow case
   __ bind(&slow_start);
   // Check that the function is really a JavaScript function.
-  // r1: pushed function (to be verified)
-  __ JumpIfSmi(r1, &non_function);
+  // r4: pushed function (to be verified)
+  __ JumpIfSmi(r4, &non_function);
 
   // Goto slow case if we do not have a function.
-  __ CompareObjectType(r1, r4, r4, JS_FUNCTION_TYPE);
-  __ b(ne, &slow);
-  __ jmp(&have_js_function);
+  __ CompareObjectType(r4, r7, r7, JS_FUNCTION_TYPE);
+  __ bne(&slow);
+  __ b(&have_js_function);
 }
 
 
 void CallICStub::GenerateMiss(MacroAssembler* masm) {
   // Get the receiver of the function from the stack; 1 ~ return address.
-  __ ldr(r4, MemOperand(sp, (arg_count() + 1) * kPointerSize));
+  __ LoadP(r7, MemOperand(sp, (arg_count() + 1) * kPointerSize), r0);
 
   {
     FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
 
     // Push the receiver and the function and feedback info.
-    __ Push(r4, r1, r2, r3);
+    __ Push(r7, r4, r5, r6);
 
     // Call the entry.
     IC::UtilityId id = GetICState() == DEFAULT ? IC::kCallIC_Miss
                                                : IC::kCallIC_Customization_Miss;
 
-    ExternalReference miss = ExternalReference(IC_Utility(id),
-                                               masm->isolate());
+    ExternalReference miss = ExternalReference(IC_Utility(id), masm->isolate());
     __ CallExternalReference(miss, 4);
 
-    // Move result to edi and exit the internal frame.
-    __ mov(r1, r0);
+    // Move result to r4 and exit the internal frame.
+    __ mr(r4, r3);
   }
 }
 
 
 // StringCharCodeAtGenerator
 void StringCharCodeAtGenerator::GenerateFast(MacroAssembler* masm) {
   // If the receiver is a smi trigger the non-string case.
   __ JumpIfSmi(object_, receiver_not_string_);
 
   // Fetch the instance type of the receiver into result register.
-  __ ldr(result_, FieldMemOperand(object_, HeapObject::kMapOffset));
-  __ ldrb(result_, FieldMemOperand(result_, Map::kInstanceTypeOffset));
+  __ LoadP(result_, FieldMemOperand(object_, HeapObject::kMapOffset));
+  __ lbz(result_, FieldMemOperand(result_, Map::kInstanceTypeOffset));
   // If the receiver is not a string trigger the non-string case.
-  __ tst(result_, Operand(kIsNotStringMask));
-  __ b(ne, receiver_not_string_);
+  __ andi(r0, result_, Operand(kIsNotStringMask));
+  __ bne(receiver_not_string_, cr0);
 
   // If the index is non-smi trigger the non-smi case.
   __ JumpIfNotSmi(index_, &index_not_smi_);
   __ bind(&got_smi_index_);
 
   // Check for index out of range.
-  __ ldr(ip, FieldMemOperand(object_, String::kLengthOffset));
-  __ cmp(ip, Operand(index_));
-  __ b(ls, index_out_of_range_);
+  __ LoadP(ip, FieldMemOperand(object_, String::kLengthOffset));
+  __ cmpl(ip, index_);
+  __ ble(index_out_of_range_);
 
   __ SmiUntag(index_);
 
-  StringCharLoadGenerator::Generate(masm,
-                                    object_,
-                                    index_,
-                                    result_,
+  StringCharLoadGenerator::Generate(masm, object_, index_, result_,
                                     &call_runtime_);
 
   __ SmiTag(result_);
   __ bind(&exit_);
 }
 
 
 void StringCharCodeAtGenerator::GenerateSlow(
-    MacroAssembler* masm,
-    const RuntimeCallHelper& call_helper) {
+    MacroAssembler* masm, const RuntimeCallHelper& call_helper) {
   __ Abort(kUnexpectedFallthroughToCharCodeAtSlowCase);
 
   // Index is not a smi.
   __ bind(&index_not_smi_);
   // If index is a heap number, try converting it to an integer.
-  __ CheckMap(index_,
-              result_,
-              Heap::kHeapNumberMapRootIndex,
-              index_not_number_,
+  __ CheckMap(index_, result_, Heap::kHeapNumberMapRootIndex, index_not_number_,
               DONT_DO_SMI_CHECK);
   call_helper.BeforeCall(masm);
   __ push(object_);
   __ push(index_);  // Consumed by runtime conversion function.
   if (index_flags_ == STRING_INDEX_IS_NUMBER) {
     __ CallRuntime(Runtime::kNumberToIntegerMapMinusZero, 1);
   } else {
     DCHECK(index_flags_ == STRING_INDEX_IS_ARRAY_INDEX);
     // NumberToSmi discards numbers that are not exact integers.
     __ CallRuntime(Runtime::kNumberToSmi, 1);
   }
   // Save the conversion result before the pop instructions below
   // have a chance to overwrite it.
-  __ Move(index_, r0);
+  __ Move(index_, r3);
   __ pop(object_);
   // Reload the instance type.
-  __ ldr(result_, FieldMemOperand(object_, HeapObject::kMapOffset));
-  __ ldrb(result_, FieldMemOperand(result_, Map::kInstanceTypeOffset));
+  __ LoadP(result_, FieldMemOperand(object_, HeapObject::kMapOffset));
+  __ lbz(result_, FieldMemOperand(result_, Map::kInstanceTypeOffset));
   call_helper.AfterCall(masm);
   // If index is still not a smi, it must be out of range.
   __ JumpIfNotSmi(index_, index_out_of_range_);
   // Otherwise, return to the fast path.
-  __ jmp(&got_smi_index_);
+  __ b(&got_smi_index_);
 
   // Call runtime. We get here when the receiver is a string and the
   // index is a number, but the code of getting the actual character
   // is too complex (e.g., when the string needs to be flattened).
   __ bind(&call_runtime_);
   call_helper.BeforeCall(masm);
   __ SmiTag(index_);
   __ Push(object_, index_);
   __ CallRuntime(Runtime::kStringCharCodeAtRT, 2);
-  __ Move(result_, r0);
+  __ Move(result_, r3);
   call_helper.AfterCall(masm);
-  __ jmp(&exit_);
+  __ b(&exit_);
 
   __ Abort(kUnexpectedFallthroughFromCharCodeAtSlowCase);
 }
 
 
 // -------------------------------------------------------------------------
 // StringCharFromCodeGenerator
 
 void StringCharFromCodeGenerator::GenerateFast(MacroAssembler* masm) {
   // Fast case of Heap::LookupSingleCharacterStringFromCode.
-  STATIC_ASSERT(kSmiTag == 0);
-  STATIC_ASSERT(kSmiShiftSize == 0);
   DCHECK(base::bits::IsPowerOfTwo32(String::kMaxOneByteCharCode + 1));
-  __ tst(code_,
-         Operand(kSmiTagMask |
-                 ((~String::kMaxOneByteCharCode) << kSmiTagSize)));
-  __ b(ne, &slow_case_);
+  __ LoadSmiLiteral(r0, Smi::FromInt(~String::kMaxOneByteCharCode));
+  __ ori(r0, r0, Operand(kSmiTagMask));
+  __ and_(r0, code_, r0);
+  __ cmpi(r0, Operand::Zero());
+  __ bne(&slow_case_);
 
   __ LoadRoot(result_, Heap::kSingleCharacterStringCacheRootIndex);
   // At this point code register contains smi tagged one-byte char code.
-  __ add(result_, result_, Operand::PointerOffsetFromSmiKey(code_));
-  __ ldr(result_, FieldMemOperand(result_, FixedArray::kHeaderSize));
+  __ mr(r0, code_);
+  __ SmiToPtrArrayOffset(code_, code_);
+  __ add(result_, result_, code_);
+  __ mr(code_, r0);
+  __ LoadP(result_, FieldMemOperand(result_, FixedArray::kHeaderSize));
   __ CompareRoot(result_, Heap::kUndefinedValueRootIndex);
-  __ b(eq, &slow_case_);
+  __ beq(&slow_case_);
   __ bind(&exit_);
 }
 
 
 void StringCharFromCodeGenerator::GenerateSlow(
-    MacroAssembler* masm,
-    const RuntimeCallHelper& call_helper) {
+    MacroAssembler* masm, const RuntimeCallHelper& call_helper) {
   __ Abort(kUnexpectedFallthroughToCharFromCodeSlowCase);
 
   __ bind(&slow_case_);
   call_helper.BeforeCall(masm);
   __ push(code_);
   __ CallRuntime(Runtime::kCharFromCode, 1);
-  __ Move(result_, r0);
+  __ Move(result_, r3);
   call_helper.AfterCall(masm);
-  __ jmp(&exit_);
+  __ b(&exit_);
 
   __ Abort(kUnexpectedFallthroughFromCharFromCodeSlowCase);
 }
 
 
 enum CopyCharactersFlags { COPY_ONE_BYTE = 1, DEST_ALWAYS_ALIGNED = 2 };
 
 
-void StringHelper::GenerateCopyCharacters(MacroAssembler* masm,
-                                          Register dest,
-                                          Register src,
-                                          Register count,
+void StringHelper::GenerateCopyCharacters(MacroAssembler* masm, Register dest,
+                                          Register src, Register count,
                                           Register scratch,
                                           String::Encoding encoding) {
   if (FLAG_debug_code) {
     // Check that destination is word aligned.
-    __ tst(dest, Operand(kPointerAlignmentMask));
-    __ Check(eq, kDestinationOfCopyNotAligned);
+    __ andi(r0, dest, Operand(kPointerAlignmentMask));
+    __ Check(eq, kDestinationOfCopyNotAligned, cr0);
   }
 
-  // Assumes word reads and writes are little endian.
   // Nothing to do for zero characters.
   Label done;
   if (encoding == String::TWO_BYTE_ENCODING) {
-    __ add(count, count, Operand(count), SetCC);
+    // double the length
+    __ add(count, count, count, LeaveOE, SetRC);
+    __ beq(&done, cr0);
+  } else {
+    __ cmpi(count, Operand::Zero());
+    __ beq(&done);
   }
 
-  Register limit = count;  // Read until dest equals this.
-  __ add(limit, dest, Operand(count));
-
-  Label loop_entry, loop;
-  // Copy bytes from src to dest until dest hits limit.
-  __ b(&loop_entry);
-  __ bind(&loop);
-  __ ldrb(scratch, MemOperand(src, 1, PostIndex), lt);
-  __ strb(scratch, MemOperand(dest, 1, PostIndex));
-  __ bind(&loop_entry);
-  __ cmp(dest, Operand(limit));
-  __ b(lt, &loop);
+  // Copy count bytes from src to dst.
+  Label byte_loop;
+  __ mtctr(count);
+  __ bind(&byte_loop);
+  __ lbz(scratch, MemOperand(src));
+  __ addi(src, src, Operand(1));
+  __ stb(scratch, MemOperand(dest));
+  __ addi(dest, dest, Operand(1));
+  __ bdnz(&byte_loop);
 
   __ bind(&done);
 }
 
 
 void SubStringStub::Generate(MacroAssembler* masm) {
   Label runtime;
 
   // Stack frame on entry.
   //  lr: return address
   //  sp[0]: to
   //  sp[4]: from
   //  sp[8]: string
 
   // This stub is called from the native-call %_SubString(...), so
   // nothing can be assumed about the arguments. It is tested that:
   //  "string" is a sequential string,
   //  both "from" and "to" are smis, and
   //  0 <= from <= to <= string.length.
   // If any of these assumptions fail, we call the runtime system.
 
   const int kToOffset = 0 * kPointerSize;
   const int kFromOffset = 1 * kPointerSize;
   const int kStringOffset = 2 * kPointerSize;
 
-  __ Ldrd(r2, r3, MemOperand(sp, kToOffset));
-  STATIC_ASSERT(kFromOffset == kToOffset + 4);
-  STATIC_ASSERT(kSmiTag == 0);
-  STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 1);
+  __ LoadP(r5, MemOperand(sp, kToOffset));
+  __ LoadP(r6, MemOperand(sp, kFromOffset));
 
-  // Arithmetic shift right by one un-smi-tags. In this case we rotate right
-  // instead because we bail out on non-smi values: ROR and ASR are equivalent
-  // for smis but they set the flags in a way that's easier to optimize.
-  __ mov(r2, Operand(r2, ROR, 1), SetCC);
-  __ mov(r3, Operand(r3, ROR, 1), SetCC, cc);
-  // If either to or from had the smi tag bit set, then C is set now, and N
-  // has the same value: we rotated by 1, so the bottom bit is now the top bit.
-  // We want to bailout to runtime here if From is negative.  In that case, the
-  // next instruction is not executed and we fall through to bailing out to
-  // runtime.
-  // Executed if both r2 and r3 are untagged integers.
-  __ sub(r2, r2, Operand(r3), SetCC, cc);
-  // One of the above un-smis or the above SUB could have set N==1.
-  __ b(mi, &runtime);  // Either "from" or "to" is not an smi, or from > to.
+  // If either to or from had the smi tag bit set, then fail to generic runtime
+  __ JumpIfNotSmi(r5, &runtime);
+  __ JumpIfNotSmi(r6, &runtime);
+  __ SmiUntag(r5);
+  __ SmiUntag(r6, SetRC);
+  // Both r5 and r6 are untagged integers.
+
+  // We want to bailout to runtime here if From is negative.
+  __ blt(&runtime, cr0);  // From < 0.
+
+  __ cmpl(r6, r5);
+  __ bgt(&runtime);  // Fail if from > to.
+  __ sub(r5, r5, r6);
 
   // Make sure first argument is a string.
-  __ ldr(r0, MemOperand(sp, kStringOffset));
-  __ JumpIfSmi(r0, &runtime);
-  Condition is_string = masm->IsObjectStringType(r0, r1);
-  __ b(NegateCondition(is_string), &runtime);
+  __ LoadP(r3, MemOperand(sp, kStringOffset));
+  __ JumpIfSmi(r3, &runtime);
+  Condition is_string = masm->IsObjectStringType(r3, r4);
+  __ b(NegateCondition(is_string), &runtime, cr0);
 
   Label single_char;
-  __ cmp(r2, Operand(1));
+  __ cmpi(r5, Operand(1));
   __ b(eq, &single_char);
 
   // Short-cut for the case of trivial substring.
-  Label return_r0;
-  // r0: original string
-  // r2: result string length
-  __ ldr(r4, FieldMemOperand(r0, String::kLengthOffset));
-  __ cmp(r2, Operand(r4, ASR, 1));
+  Label return_r3;
+  // r3: original string
+  // r5: result string length
+  __ LoadP(r7, FieldMemOperand(r3, String::kLengthOffset));
+  __ SmiUntag(r0, r7);
+  __ cmpl(r5, r0);
   // Return original string.
-  __ b(eq, &return_r0);
+  __ beq(&return_r3);
   // Longer than original string's length or negative: unsafe arguments.
-  __ b(hi, &runtime);
+  __ bgt(&runtime);
   // Shorter than original string's length: an actual substring.
 
   // Deal with different string types: update the index if necessary
-  // and put the underlying string into r5.
-  // r0: original string
-  // r1: instance type
-  // r2: length
-  // r3: from index (untagged)
+  // and put the underlying string into r8.
+  // r3: original string
+  // r4: instance type
+  // r5: length
+  // r6: from index (untagged)
   Label underlying_unpacked, sliced_string, seq_or_external_string;
   // If the string is not indirect, it can only be sequential or external.
   STATIC_ASSERT(kIsIndirectStringMask == (kSlicedStringTag & kConsStringTag));
   STATIC_ASSERT(kIsIndirectStringMask != 0);
-  __ tst(r1, Operand(kIsIndirectStringMask));
-  __ b(eq, &seq_or_external_string);
+  __ andi(r0, r4, Operand(kIsIndirectStringMask));
+  __ beq(&seq_or_external_string, cr0);
 
-  __ tst(r1, Operand(kSlicedNotConsMask));
-  __ b(ne, &sliced_string);
+  __ andi(r0, r4, Operand(kSlicedNotConsMask));
+  __ bne(&sliced_string, cr0);
   // Cons string.  Check whether it is flat, then fetch first part.
-  __ ldr(r5, FieldMemOperand(r0, ConsString::kSecondOffset));
-  __ CompareRoot(r5, Heap::kempty_stringRootIndex);
-  __ b(ne, &runtime);
-  __ ldr(r5, FieldMemOperand(r0, ConsString::kFirstOffset));
+  __ LoadP(r8, FieldMemOperand(r3, ConsString::kSecondOffset));
+  __ CompareRoot(r8, Heap::kempty_stringRootIndex);
+  __ bne(&runtime);
+  __ LoadP(r8, FieldMemOperand(r3, ConsString::kFirstOffset));
   // Update instance type.
-  __ ldr(r1, FieldMemOperand(r5, HeapObject::kMapOffset));
-  __ ldrb(r1, FieldMemOperand(r1, Map::kInstanceTypeOffset));
-  __ jmp(&underlying_unpacked);
+  __ LoadP(r4, FieldMemOperand(r8, HeapObject::kMapOffset));
+  __ lbz(r4, FieldMemOperand(r4, Map::kInstanceTypeOffset));
+  __ b(&underlying_unpacked);
 
   __ bind(&sliced_string);
   // Sliced string.  Fetch parent and correct start index by offset.
-  __ ldr(r5, FieldMemOperand(r0, SlicedString::kParentOffset));
-  __ ldr(r4, FieldMemOperand(r0, SlicedString::kOffsetOffset));
-  __ add(r3, r3, Operand(r4, ASR, 1));  // Add offset to index.
+  __ LoadP(r8, FieldMemOperand(r3, SlicedString::kParentOffset));
+  __ LoadP(r7, FieldMemOperand(r3, SlicedString::kOffsetOffset));
+  __ SmiUntag(r4, r7);
+  __ add(r6, r6, r4);  // Add offset to index.
   // Update instance type.
-  __ ldr(r1, FieldMemOperand(r5, HeapObject::kMapOffset));
-  __ ldrb(r1, FieldMemOperand(r1, Map::kInstanceTypeOffset));
-  __ jmp(&underlying_unpacked);
+  __ LoadP(r4, FieldMemOperand(r8, HeapObject::kMapOffset));
+  __ lbz(r4, FieldMemOperand(r4, Map::kInstanceTypeOffset));
+  __ b(&underlying_unpacked);
 
   __ bind(&seq_or_external_string);
   // Sequential or external string.  Just move string to the expected register.
-  __ mov(r5, r0);
+  __ mr(r8, r3);
 
   __ bind(&underlying_unpacked);
 
   if (FLAG_string_slices) {
     Label copy_routine;
-    // r5: underlying subject string
-    // r1: instance type of underlying subject string
-    // r2: length
-    // r3: adjusted start index (untagged)
-    __ cmp(r2, Operand(SlicedString::kMinLength));
+    // r8: underlying subject string
+    // r4: instance type of underlying subject string
+    // r5: length
+    // r6: adjusted start index (untagged)
+    __ cmpi(r5, Operand(SlicedString::kMinLength));
     // Short slice.  Copy instead of slicing.
-    __ b(lt, &copy_routine);
+    __ blt(&copy_routine);
     // Allocate new sliced string.  At this point we do not reload the instance
     // type including the string encoding because we simply rely on the info
     // provided by the original string.  It does not matter if the original
     // string's encoding is wrong because we always have to recheck encoding of
     // the newly created string's parent anyways due to externalized strings.
     Label two_byte_slice, set_slice_header;
     STATIC_ASSERT((kStringEncodingMask & kOneByteStringTag) != 0);
     STATIC_ASSERT((kStringEncodingMask & kTwoByteStringTag) == 0);
-    __ tst(r1, Operand(kStringEncodingMask));
-    __ b(eq, &two_byte_slice);
-    __ AllocateOneByteSlicedString(r0, r2, r6, r4, &runtime);
-    __ jmp(&set_slice_header);
+    __ andi(r0, r4, Operand(kStringEncodingMask));
+    __ beq(&two_byte_slice, cr0);
+    __ AllocateOneByteSlicedString(r3, r5, r9, r10, &runtime);
+    __ b(&set_slice_header);
     __ bind(&two_byte_slice);
-    __ AllocateTwoByteSlicedString(r0, r2, r6, r4, &runtime);
+    __ AllocateTwoByteSlicedString(r3, r5, r9, r10, &runtime);
     __ bind(&set_slice_header);
-    __ mov(r3, Operand(r3, LSL, 1));
-    __ str(r5, FieldMemOperand(r0, SlicedString::kParentOffset));
-    __ str(r3, FieldMemOperand(r0, SlicedString::kOffsetOffset));
-    __ jmp(&return_r0);
+    __ SmiTag(r6);
+    __ StoreP(r8, FieldMemOperand(r3, SlicedString::kParentOffset), r0);
+    __ StoreP(r6, FieldMemOperand(r3, SlicedString::kOffsetOffset), r0);
+    __ b(&return_r3);
 
     __ bind(&copy_routine);
   }
 
-  // r5: underlying subject string
-  // r1: instance type of underlying subject string
-  // r2: length
-  // r3: adjusted start index (untagged)
+  // r8: underlying subject string
+  // r4: instance type of underlying subject string
+  // r5: length
+  // r6: adjusted start index (untagged)
   Label two_byte_sequential, sequential_string, allocate_result;
   STATIC_ASSERT(kExternalStringTag != 0);
   STATIC_ASSERT(kSeqStringTag == 0);
-  __ tst(r1, Operand(kExternalStringTag));
-  __ b(eq, &sequential_string);
+  __ andi(r0, r4, Operand(kExternalStringTag));
+  __ beq(&sequential_string, cr0);
 
   // Handle external string.
   // Rule out short external strings.
   STATIC_ASSERT(kShortExternalStringTag != 0);
-  __ tst(r1, Operand(kShortExternalStringTag));
-  __ b(ne, &runtime);
-  __ ldr(r5, FieldMemOperand(r5, ExternalString::kResourceDataOffset));
-  // r5 already points to the first character of underlying string.
-  __ jmp(&allocate_result);
+  __ andi(r0, r4, Operand(kShortExternalStringTag));
+  __ bne(&runtime, cr0);
+  __ LoadP(r8, FieldMemOperand(r8, ExternalString::kResourceDataOffset));
+  // r8 already points to the first character of underlying string.
+  __ b(&allocate_result);
 
   __ bind(&sequential_string);
   // Locate first character of underlying subject string.
   STATIC_ASSERT(SeqTwoByteString::kHeaderSize == SeqOneByteString::kHeaderSize);
-  __ add(r5, r5, Operand(SeqOneByteString::kHeaderSize - kHeapObjectTag));
+  __ addi(r8, r8, Operand(SeqOneByteString::kHeaderSize - kHeapObjectTag));
 
   __ bind(&allocate_result);
   // Sequential acii string.  Allocate the result.
   STATIC_ASSERT((kOneByteStringTag & kStringEncodingMask) != 0);
-  __ tst(r1, Operand(kStringEncodingMask));
-  __ b(eq, &two_byte_sequential);
+  __ andi(r0, r4, Operand(kStringEncodingMask));
+  __ beq(&two_byte_sequential, cr0);
 
   // Allocate and copy the resulting one-byte string.
-  __ AllocateOneByteString(r0, r2, r4, r6, r1, &runtime);
+  __ AllocateOneByteString(r3, r5, r7, r9, r10, &runtime);
 
   // Locate first character of substring to copy.
-  __ add(r5, r5, r3);
+  __ add(r8, r8, r6);
   // Locate first character of result.
-  __ add(r1, r0, Operand(SeqOneByteString::kHeaderSize - kHeapObjectTag));
+  __ addi(r4, r3, Operand(SeqOneByteString::kHeaderSize - kHeapObjectTag));
 
-  // r0: result string
-  // r1: first character of result string
-  // r2: result string length
-  // r5: first character of substring to copy
+  // r3: result string
+  // r4: first character of result string
+  // r5: result string length
+  // r8: first character of substring to copy
   STATIC_ASSERT((SeqOneByteString::kHeaderSize & kObjectAlignmentMask) == 0);
-  StringHelper::GenerateCopyCharacters(
-      masm, r1, r5, r2, r3, String::ONE_BYTE_ENCODING);
-  __ jmp(&return_r0);
+  StringHelper::GenerateCopyCharacters(masm, r4, r8, r5, r6,
+                                       String::ONE_BYTE_ENCODING);
+  __ b(&return_r3);
 
   // Allocate and copy the resulting two-byte string.
   __ bind(&two_byte_sequential);
-  __ AllocateTwoByteString(r0, r2, r4, r6, r1, &runtime);
+  __ AllocateTwoByteString(r3, r5, r7, r9, r10, &runtime);
 
   // Locate first character of substring to copy.
-  STATIC_ASSERT(kSmiTagSize == 1 && kSmiTag == 0);
-  __ add(r5, r5, Operand(r3, LSL, 1));
+  __ ShiftLeftImm(r4, r6, Operand(1));
+  __ add(r8, r8, r4);
   // Locate first character of result.
-  __ add(r1, r0, Operand(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
+  __ addi(r4, r3, Operand(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
 
-  // r0: result string.
-  // r1: first character of result.
-  // r2: result length.
-  // r5: first character of substring to copy.
+  // r3: result string.
+  // r4: first character of result.
+  // r5: result length.
+  // r8: first character of substring to copy.
   STATIC_ASSERT((SeqTwoByteString::kHeaderSize & kObjectAlignmentMask) == 0);
-  StringHelper::GenerateCopyCharacters(
-      masm, r1, r5, r2, r3, String::TWO_BYTE_ENCODING);
+  StringHelper::GenerateCopyCharacters(masm, r4, r8, r5, r6,
+                                       String::TWO_BYTE_ENCODING);
 
-  __ bind(&return_r0);
+  __ bind(&return_r3);
   Counters* counters = isolate()->counters();
-  __ IncrementCounter(counters->sub_string_native(), 1, r3, r4);
+  __ IncrementCounter(counters->sub_string_native(), 1, r6, r7);
   __ Drop(3);
   __ Ret();
 
   // Just jump to runtime to create the sub string.
   __ bind(&runtime);
   __ TailCallRuntime(Runtime::kSubString, 3, 1);
 
   __ bind(&single_char);
-  // r0: original string
-  // r1: instance type
-  // r2: length
-  // r3: from index (untagged)
-  __ SmiTag(r3, r3);
-  StringCharAtGenerator generator(
-      r0, r3, r2, r0, &runtime, &runtime, &runtime, STRING_INDEX_IS_NUMBER);
+  // r3: original string
+  // r4: instance type
+  // r5: length
+  // r6: from index (untagged)
+  __ SmiTag(r6, r6);
+  StringCharAtGenerator generator(r3, r6, r5, r3, &runtime, &runtime, &runtime,
+                                  STRING_INDEX_IS_NUMBER);
   generator.GenerateFast(masm);
   __ Drop(3);
   __ Ret();
   generator.SkipSlow(masm, &runtime);
 }
 
 
-void StringHelper::GenerateFlatOneByteStringEquals(
-    MacroAssembler* masm, Register left, Register right, Register scratch1,
-    Register scratch2, Register scratch3) {
+void StringHelper::GenerateFlatOneByteStringEquals(MacroAssembler* masm,
+                                                   Register left,
+                                                   Register right,
+                                                   Register scratch1,
+                                                   Register scratch2) {
   Register length = scratch1;
 
   // Compare lengths.
   Label strings_not_equal, check_zero_length;
-  __ ldr(length, FieldMemOperand(left, String::kLengthOffset));
-  __ ldr(scratch2, FieldMemOperand(right, String::kLengthOffset));
+  __ LoadP(length, FieldMemOperand(left, String::kLengthOffset));
+  __ LoadP(scratch2, FieldMemOperand(right, String::kLengthOffset));
   __ cmp(length, scratch2);
-  __ b(eq, &check_zero_length);
+  __ beq(&check_zero_length);
   __ bind(&strings_not_equal);
-  __ mov(r0, Operand(Smi::FromInt(NOT_EQUAL)));
+  __ LoadSmiLiteral(r3, Smi::FromInt(NOT_EQUAL));
   __ Ret();
 
   // Check if the length is zero.
   Label compare_chars;
   __ bind(&check_zero_length);
   STATIC_ASSERT(kSmiTag == 0);
-  __ cmp(length, Operand::Zero());
-  __ b(ne, &compare_chars);
-  __ mov(r0, Operand(Smi::FromInt(EQUAL)));
+  __ cmpi(length, Operand::Zero());
+  __ bne(&compare_chars);
+  __ LoadSmiLiteral(r3, Smi::FromInt(EQUAL));
   __ Ret();
 
   // Compare characters.
   __ bind(&compare_chars);
-  GenerateOneByteCharsCompareLoop(masm, left, right, length, scratch2, scratch3,
+  GenerateOneByteCharsCompareLoop(masm, left, right, length, scratch2,
                                   &strings_not_equal);
 
   // Characters are equal.
-  __ mov(r0, Operand(Smi::FromInt(EQUAL)));
+  __ LoadSmiLiteral(r3, Smi::FromInt(EQUAL));
   __ Ret();
 }
 
 
 void StringHelper::GenerateCompareFlatOneByteStrings(
     MacroAssembler* masm, Register left, Register right, Register scratch1,
-    Register scratch2, Register scratch3, Register scratch4) {
-  Label result_not_equal, compare_lengths;
+    Register scratch2, Register scratch3) {
+  Label skip, result_not_equal, compare_lengths;
   // Find minimum length and length difference.
-  __ ldr(scratch1, FieldMemOperand(left, String::kLengthOffset));
-  __ ldr(scratch2, FieldMemOperand(right, String::kLengthOffset));
-  __ sub(scratch3, scratch1, Operand(scratch2), SetCC);
+  __ LoadP(scratch1, FieldMemOperand(left, String::kLengthOffset));
+  __ LoadP(scratch2, FieldMemOperand(right, String::kLengthOffset));
+  __ sub(scratch3, scratch1, scratch2, LeaveOE, SetRC);
   Register length_delta = scratch3;
-  __ mov(scratch1, scratch2, LeaveCC, gt);
+  __ ble(&skip, cr0);
+  __ mr(scratch1, scratch2);
+  __ bind(&skip);
   Register min_length = scratch1;
   STATIC_ASSERT(kSmiTag == 0);
-  __ cmp(min_length, Operand::Zero());
-  __ b(eq, &compare_lengths);
+  __ cmpi(min_length, Operand::Zero());
+  __ beq(&compare_lengths);
 
   // Compare loop.
   GenerateOneByteCharsCompareLoop(masm, left, right, min_length, scratch2,
-                                  scratch4, &result_not_equal);
+                                  &result_not_equal);
 
   // Compare lengths - strings up to min-length are equal.
   __ bind(&compare_lengths);
   DCHECK(Smi::FromInt(EQUAL) == static_cast<Smi*>(0));
   // Use length_delta as result if it's zero.
-  __ mov(r0, Operand(length_delta), SetCC);
+  __ mr(r3, length_delta);
+  __ cmpi(r3, Operand::Zero());
   __ bind(&result_not_equal);
   // Conditionally update the result based either on length_delta or
   // the last comparion performed in the loop above.
-  __ mov(r0, Operand(Smi::FromInt(GREATER)), LeaveCC, gt);
-  __ mov(r0, Operand(Smi::FromInt(LESS)), LeaveCC, lt);
+  Label less_equal, equal;
+  __ ble(&less_equal);
+  __ LoadSmiLiteral(r3, Smi::FromInt(GREATER));
+  __ Ret();
+  __ bind(&less_equal);
+  __ beq(&equal);
+  __ LoadSmiLiteral(r3, Smi::FromInt(LESS));
+  __ bind(&equal);
   __ Ret();
 }
 
 
 void StringHelper::GenerateOneByteCharsCompareLoop(
     MacroAssembler* masm, Register left, Register right, Register length,
-    Register scratch1, Register scratch2, Label* chars_not_equal) {
+    Register scratch1, Label* chars_not_equal) {
   // Change index to run from -length to -1 by adding length to string
   // start. This means that loop ends when index reaches zero, which
   // doesn't need an additional compare.
   __ SmiUntag(length);
-  __ add(scratch1, length,
-         Operand(SeqOneByteString::kHeaderSize - kHeapObjectTag));
-  __ add(left, left, Operand(scratch1));
-  __ add(right, right, Operand(scratch1));
-  __ rsb(length, length, Operand::Zero());
+  __ addi(scratch1, length,
+          Operand(SeqOneByteString::kHeaderSize - kHeapObjectTag));
+  __ add(left, left, scratch1);
+  __ add(right, right, scratch1);
+  __ subfic(length, length, Operand::Zero());
   Register index = length;  // index = -length;
 
   // Compare loop.
   Label loop;
   __ bind(&loop);
-  __ ldrb(scratch1, MemOperand(left, index));
-  __ ldrb(scratch2, MemOperand(right, index));
-  __ cmp(scratch1, scratch2);
-  __ b(ne, chars_not_equal);
-  __ add(index, index, Operand(1), SetCC);
-  __ b(ne, &loop);
+  __ lbzx(scratch1, MemOperand(left, index));
+  __ lbzx(r0, MemOperand(right, index));
+  __ cmp(scratch1, r0);
+  __ bne(chars_not_equal);
+  __ addi(index, index, Operand(1));
+  __ cmpi(index, Operand::Zero());
+  __ bne(&loop);
 }
 
 
 void StringCompareStub::Generate(MacroAssembler* masm) {
   Label runtime;
 
   Counters* counters = isolate()->counters();
 
   // Stack frame on entry.
   //  sp[0]: right string
   //  sp[4]: left string
-  __ Ldrd(r0 , r1, MemOperand(sp));  // Load right in r0, left in r1.
+  __ LoadP(r3, MemOperand(sp));  // Load right in r3, left in r4.
+  __ LoadP(r4, MemOperand(sp, kPointerSize));
 
   Label not_same;
-  __ cmp(r0, r1);
-  __ b(ne, &not_same);
+  __ cmp(r3, r4);
+  __ bne(&not_same);
   STATIC_ASSERT(EQUAL == 0);
   STATIC_ASSERT(kSmiTag == 0);
-  __ mov(r0, Operand(Smi::FromInt(EQUAL)));
-  __ IncrementCounter(counters->string_compare_native(), 1, r1, r2);
-  __ add(sp, sp, Operand(2 * kPointerSize));
+  __ LoadSmiLiteral(r3, Smi::FromInt(EQUAL));
+  __ IncrementCounter(counters->string_compare_native(), 1, r4, r5);
+  __ addi(sp, sp, Operand(2 * kPointerSize));
   __ Ret();
 
   __ bind(&not_same);
 
   // Check that both objects are sequential one-byte strings.
-  __ JumpIfNotBothSequentialOneByteStrings(r1, r0, r2, r3, &runtime);
+  __ JumpIfNotBothSequentialOneByteStrings(r4, r3, r5, r6, &runtime);
 
   // Compare flat one-byte strings natively. Remove arguments from stack first.
-  __ IncrementCounter(counters->string_compare_native(), 1, r2, r3);
-  __ add(sp, sp, Operand(2 * kPointerSize));
-  StringHelper::GenerateCompareFlatOneByteStrings(masm, r1, r0, r2, r3, r4, r5);
+  __ IncrementCounter(counters->string_compare_native(), 1, r5, r6);
+  __ addi(sp, sp, Operand(2 * kPointerSize));
+  StringHelper::GenerateCompareFlatOneByteStrings(masm, r4, r3, r5, r6, r7);
 
   // Call the runtime; it returns -1 (less), 0 (equal), or 1 (greater)
   // tagged as a small integer.
   __ bind(&runtime);
   __ TailCallRuntime(Runtime::kStringCompare, 2, 1);
 }
 
 
 void BinaryOpICWithAllocationSiteStub::Generate(MacroAssembler* masm) {
   // ----------- S t a t e -------------
-  //  -- r1    : left
-  //  -- r0    : right
+  //  -- r4    : left
+  //  -- r3    : right
   //  -- lr    : return address
   // -----------------------------------
 
-  // Load r2 with the allocation site.  We stick an undefined dummy value here
+  // Load r5 with the allocation site.  We stick an undefined dummy value here
   // and replace it with the real allocation site later when we instantiate this
   // stub in BinaryOpICWithAllocationSiteStub::GetCodeCopyFromTemplate().
-  __ Move(r2, handle(isolate()->heap()->undefined_value()));
+  __ Move(r5, handle(isolate()->heap()->undefined_value()));
 
   // Make sure that we actually patched the allocation site.
   if (FLAG_debug_code) {
-    __ tst(r2, Operand(kSmiTagMask));
-    __ Assert(ne, kExpectedAllocationSite);
-    __ push(r2);
-    __ ldr(r2, FieldMemOperand(r2, HeapObject::kMapOffset));
+    __ TestIfSmi(r5, r0);
+    __ Assert(ne, kExpectedAllocationSite, cr0);
+    __ push(r5);
+    __ LoadP(r5, FieldMemOperand(r5, HeapObject::kMapOffset));
     __ LoadRoot(ip, Heap::kAllocationSiteMapRootIndex);
-    __ cmp(r2, ip);
-    __ pop(r2);
+    __ cmp(r5, ip);
+    __ pop(r5);
     __ Assert(eq, kExpectedAllocationSite);
   }
 
   // Tail call into the stub that handles binary operations with allocation
   // sites.
   BinaryOpWithAllocationSiteStub stub(isolate(), state());
   __ TailCallStub(&stub);
 }
 
 
 void CompareICStub::GenerateSmis(MacroAssembler* masm) {
   DCHECK(state() == CompareICState::SMI);
   Label miss;
-  __ orr(r2, r1, r0);
-  __ JumpIfNotSmi(r2, &miss);
+  __ orx(r5, r4, r3);
+  __ JumpIfNotSmi(r5, &miss);
 
   if (GetCondition() == eq) {
     // For equality we do not care about the sign of the result.
-    __ sub(r0, r0, r1, SetCC);
+    // __ sub(r3, r3, r4, SetCC);
+    __ sub(r3, r3, r4);
   } else {
     // Untag before subtracting to avoid handling overflow.
-    __ SmiUntag(r1);
-    __ sub(r0, r1, Operand::SmiUntag(r0));
+    __ SmiUntag(r4);
+    __ SmiUntag(r3);
+    __ sub(r3, r4, r3);
   }
   __ Ret();
 
   __ bind(&miss);
   GenerateMiss(masm);
 }
 
 
 void CompareICStub::GenerateNumbers(MacroAssembler* masm) {
   DCHECK(state() == CompareICState::NUMBER);
 
   Label generic_stub;
   Label unordered, maybe_undefined1, maybe_undefined2;
   Label miss;
+  Label equal, less_than;
 
   if (left() == CompareICState::SMI) {
-    __ JumpIfNotSmi(r1, &miss);
+    __ JumpIfNotSmi(r4, &miss);
   }
   if (right() == CompareICState::SMI) {
-    __ JumpIfNotSmi(r0, &miss);
+    __ JumpIfNotSmi(r3, &miss);
   }
 
   // Inlining the double comparison and falling back to the general compare
   // stub if NaN is involved.
   // Load left and right operand.
   Label done, left, left_smi, right_smi;
-  __ JumpIfSmi(r0, &right_smi);
-  __ CheckMap(r0, r2, Heap::kHeapNumberMapRootIndex, &maybe_undefined1,
+  __ JumpIfSmi(r3, &right_smi);
+  __ CheckMap(r3, r5, Heap::kHeapNumberMapRootIndex, &maybe_undefined1,
               DONT_DO_SMI_CHECK);
-  __ sub(r2, r0, Operand(kHeapObjectTag));
-  __ vldr(d1, r2, HeapNumber::kValueOffset);
+  __ lfd(d1, FieldMemOperand(r3, HeapNumber::kValueOffset));
   __ b(&left);
   __ bind(&right_smi);
-  __ SmiToDouble(d1, r0);
+  __ SmiToDouble(d1, r3);
 
   __ bind(&left);
-  __ JumpIfSmi(r1, &left_smi);
-  __ CheckMap(r1, r2, Heap::kHeapNumberMapRootIndex, &maybe_undefined2,
+  __ JumpIfSmi(r4, &left_smi);
+  __ CheckMap(r4, r5, Heap::kHeapNumberMapRootIndex, &maybe_undefined2,
               DONT_DO_SMI_CHECK);
-  __ sub(r2, r1, Operand(kHeapObjectTag));
-  __ vldr(d0, r2, HeapNumber::kValueOffset);
+  __ lfd(d0, FieldMemOperand(r4, HeapNumber::kValueOffset));
   __ b(&done);
   __ bind(&left_smi);
-  __ SmiToDouble(d0, r1);
+  __ SmiToDouble(d0, r4);
 
   __ bind(&done);
-  // Compare operands.
-  __ VFPCompareAndSetFlags(d0, d1);
+
+  // Compare operands
+  __ fcmpu(d0, d1);
 
   // Don't base result on status bits when a NaN is involved.
-  __ b(vs, &unordered);
+  __ bunordered(&unordered);
 
   // Return a result of -1, 0, or 1, based on status bits.
-  __ mov(r0, Operand(EQUAL), LeaveCC, eq);
-  __ mov(r0, Operand(LESS), LeaveCC, lt);
-  __ mov(r0, Operand(GREATER), LeaveCC, gt);
+  __ beq(&equal);
+  __ blt(&less_than);
+  //  assume greater than
+  __ li(r3, Operand(GREATER));
+  __ Ret();
+  __ bind(&equal);
+  __ li(r3, Operand(EQUAL));
+  __ Ret();
+  __ bind(&less_than);
+  __ li(r3, Operand(LESS));
   __ Ret();
 
   __ bind(&unordered);
   __ bind(&generic_stub);
   CompareICStub stub(isolate(), op(), CompareICState::GENERIC,
                      CompareICState::GENERIC, CompareICState::GENERIC);
   __ Jump(stub.GetCode(), RelocInfo::CODE_TARGET);
 
   __ bind(&maybe_undefined1);
   if (Token::IsOrderedRelationalCompareOp(op())) {
-    __ CompareRoot(r0, Heap::kUndefinedValueRootIndex);
-    __ b(ne, &miss);
-    __ JumpIfSmi(r1, &unordered);
-    __ CompareObjectType(r1, r2, r2, HEAP_NUMBER_TYPE);
-    __ b(ne, &maybe_undefined2);
-    __ jmp(&unordered);
+    __ CompareRoot(r3, Heap::kUndefinedValueRootIndex);
+    __ bne(&miss);
+    __ JumpIfSmi(r4, &unordered);
+    __ CompareObjectType(r4, r5, r5, HEAP_NUMBER_TYPE);
+    __ bne(&maybe_undefined2);
+    __ b(&unordered);
   }
 
   __ bind(&maybe_undefined2);
   if (Token::IsOrderedRelationalCompareOp(op())) {
-    __ CompareRoot(r1, Heap::kUndefinedValueRootIndex);
-    __ b(eq, &unordered);
+    __ CompareRoot(r4, Heap::kUndefinedValueRootIndex);
+    __ beq(&unordered);
   }
 
   __ bind(&miss);
   GenerateMiss(masm);
 }
 
 
 void CompareICStub::GenerateInternalizedStrings(MacroAssembler* masm) {
   DCHECK(state() == CompareICState::INTERNALIZED_STRING);
-  Label miss;
+  Label miss, not_equal;
 
   // Registers containing left and right operands respectively.
-  Register left = r1;
-  Register right = r0;
-  Register tmp1 = r2;
-  Register tmp2 = r3;
+  Register left = r4;
+  Register right = r3;
+  Register tmp1 = r5;
+  Register tmp2 = r6;
 
   // Check that both operands are heap objects.
   __ JumpIfEitherSmi(left, right, &miss);
 
-  // Check that both operands are internalized strings.
-  __ ldr(tmp1, FieldMemOperand(left, HeapObject::kMapOffset));
-  __ ldr(tmp2, FieldMemOperand(right, HeapObject::kMapOffset));
-  __ ldrb(tmp1, FieldMemOperand(tmp1, Map::kInstanceTypeOffset));
-  __ ldrb(tmp2, FieldMemOperand(tmp2, Map::kInstanceTypeOffset));
+  // Check that both operands are symbols.
+  __ LoadP(tmp1, FieldMemOperand(left, HeapObject::kMapOffset));
+  __ LoadP(tmp2, FieldMemOperand(right, HeapObject::kMapOffset));
+  __ lbz(tmp1, FieldMemOperand(tmp1, Map::kInstanceTypeOffset));
+  __ lbz(tmp2, FieldMemOperand(tmp2, Map::kInstanceTypeOffset));
   STATIC_ASSERT(kInternalizedTag == 0 && kStringTag == 0);
-  __ orr(tmp1, tmp1, Operand(tmp2));
-  __ tst(tmp1, Operand(kIsNotStringMask | kIsNotInternalizedMask));
-  __ b(ne, &miss);
+  __ orx(tmp1, tmp1, tmp2);
+  __ andi(r0, tmp1, Operand(kIsNotStringMask | kIsNotInternalizedMask));
+  __ bne(&miss, cr0);
 
   // Internalized strings are compared by identity.
   __ cmp(left, right);
-  // Make sure r0 is non-zero. At this point input operands are
+  __ bne(&not_equal);
+  // Make sure r3 is non-zero. At this point input operands are
   // guaranteed to be non-zero.
-  DCHECK(right.is(r0));
+  DCHECK(right.is(r3));
   STATIC_ASSERT(EQUAL == 0);
   STATIC_ASSERT(kSmiTag == 0);
-  __ mov(r0, Operand(Smi::FromInt(EQUAL)), LeaveCC, eq);
+  __ LoadSmiLiteral(r3, Smi::FromInt(EQUAL));
+  __ bind(&not_equal);
   __ Ret();
 
   __ bind(&miss);
   GenerateMiss(masm);
 }
 
 
 void CompareICStub::GenerateUniqueNames(MacroAssembler* masm) {
   DCHECK(state() == CompareICState::UNIQUE_NAME);
   DCHECK(GetCondition() == eq);
   Label miss;
 
   // Registers containing left and right operands respectively.
-  Register left = r1;
-  Register right = r0;
-  Register tmp1 = r2;
-  Register tmp2 = r3;
+  Register left = r4;
+  Register right = r3;
+  Register tmp1 = r5;
+  Register tmp2 = r6;
 
   // Check that both operands are heap objects.
   __ JumpIfEitherSmi(left, right, &miss);
 
   // Check that both operands are unique names. This leaves the instance
   // types loaded in tmp1 and tmp2.
-  __ ldr(tmp1, FieldMemOperand(left, HeapObject::kMapOffset));
-  __ ldr(tmp2, FieldMemOperand(right, HeapObject::kMapOffset));
-  __ ldrb(tmp1, FieldMemOperand(tmp1, Map::kInstanceTypeOffset));
-  __ ldrb(tmp2, FieldMemOperand(tmp2, Map::kInstanceTypeOffset));
+  __ LoadP(tmp1, FieldMemOperand(left, HeapObject::kMapOffset));
+  __ LoadP(tmp2, FieldMemOperand(right, HeapObject::kMapOffset));
+  __ lbz(tmp1, FieldMemOperand(tmp1, Map::kInstanceTypeOffset));
+  __ lbz(tmp2, FieldMemOperand(tmp2, Map::kInstanceTypeOffset));
 
-  __ JumpIfNotUniqueName(tmp1, &miss);
-  __ JumpIfNotUniqueName(tmp2, &miss);
+  __ JumpIfNotUniqueNameInstanceType(tmp1, &miss);
+  __ JumpIfNotUniqueNameInstanceType(tmp2, &miss);
 
   // Unique names are compared by identity.
   __ cmp(left, right);
-  // Make sure r0 is non-zero. At this point input operands are
+  __ bne(&miss);
+  // Make sure r3 is non-zero. At this point input operands are
   // guaranteed to be non-zero.
-  DCHECK(right.is(r0));
+  DCHECK(right.is(r3));
   STATIC_ASSERT(EQUAL == 0);
   STATIC_ASSERT(kSmiTag == 0);
-  __ mov(r0, Operand(Smi::FromInt(EQUAL)), LeaveCC, eq);
+  __ LoadSmiLiteral(r3, Smi::FromInt(EQUAL));
   __ Ret();
 
   __ bind(&miss);
   GenerateMiss(masm);
 }
 
 
 void CompareICStub::GenerateStrings(MacroAssembler* masm) {
   DCHECK(state() == CompareICState::STRING);
-  Label miss;
+  Label miss, not_identical, is_symbol;
 
   bool equality = Token::IsEqualityOp(op());
 
   // Registers containing left and right operands respectively.
-  Register left = r1;
-  Register right = r0;
-  Register tmp1 = r2;
-  Register tmp2 = r3;
-  Register tmp3 = r4;
-  Register tmp4 = r5;
+  Register left = r4;
+  Register right = r3;
+  Register tmp1 = r5;
+  Register tmp2 = r6;
+  Register tmp3 = r7;
+  Register tmp4 = r8;
 
   // Check that both operands are heap objects.
   __ JumpIfEitherSmi(left, right, &miss);
 
   // Check that both operands are strings. This leaves the instance
   // types loaded in tmp1 and tmp2.
-  __ ldr(tmp1, FieldMemOperand(left, HeapObject::kMapOffset));
-  __ ldr(tmp2, FieldMemOperand(right, HeapObject::kMapOffset));
-  __ ldrb(tmp1, FieldMemOperand(tmp1, Map::kInstanceTypeOffset));
-  __ ldrb(tmp2, FieldMemOperand(tmp2, Map::kInstanceTypeOffset));
+  __ LoadP(tmp1, FieldMemOperand(left, HeapObject::kMapOffset));
+  __ LoadP(tmp2, FieldMemOperand(right, HeapObject::kMapOffset));
+  __ lbz(tmp1, FieldMemOperand(tmp1, Map::kInstanceTypeOffset));
+  __ lbz(tmp2, FieldMemOperand(tmp2, Map::kInstanceTypeOffset));
   STATIC_ASSERT(kNotStringTag != 0);
-  __ orr(tmp3, tmp1, tmp2);
-  __ tst(tmp3, Operand(kIsNotStringMask));
-  __ b(ne, &miss);
+  __ orx(tmp3, tmp1, tmp2);
+  __ andi(r0, tmp3, Operand(kIsNotStringMask));
+  __ bne(&miss, cr0);
 
   // Fast check for identical strings.
   __ cmp(left, right);
   STATIC_ASSERT(EQUAL == 0);
   STATIC_ASSERT(kSmiTag == 0);
-  __ mov(r0, Operand(Smi::FromInt(EQUAL)), LeaveCC, eq);
-  __ Ret(eq);
+  __ bne(&not_identical);
+  __ LoadSmiLiteral(r3, Smi::FromInt(EQUAL));
+  __ Ret();
+  __ bind(&not_identical);
 
   // Handle not identical strings.
 
   // Check that both strings are internalized strings. If they are, we're done
   // because we already know they are not identical. We know they are both
   // strings.
   if (equality) {
     DCHECK(GetCondition() == eq);
     STATIC_ASSERT(kInternalizedTag == 0);
-    __ orr(tmp3, tmp1, Operand(tmp2));
-    __ tst(tmp3, Operand(kIsNotInternalizedMask));
-    // Make sure r0 is non-zero. At this point input operands are
+    __ orx(tmp3, tmp1, tmp2);
+    __ andi(r0, tmp3, Operand(kIsNotInternalizedMask));
+    __ bne(&is_symbol, cr0);
+    // Make sure r3 is non-zero. At this point input operands are
     // guaranteed to be non-zero.
-    DCHECK(right.is(r0));
-    __ Ret(eq);
+    DCHECK(right.is(r3));
+    __ Ret();
+    __ bind(&is_symbol);
   }
 
   // Check that both strings are sequential one-byte.
   Label runtime;
   __ JumpIfBothInstanceTypesAreNotSequentialOneByte(tmp1, tmp2, tmp3, tmp4,
                                                     &runtime);
 
   // Compare flat one-byte strings. Returns when done.
   if (equality) {
-    StringHelper::GenerateFlatOneByteStringEquals(masm, left, right, tmp1, tmp2,
-                                                  tmp3);
+    StringHelper::GenerateFlatOneByteStringEquals(masm, left, right, tmp1,
+                                                  tmp2);
   } else {
     StringHelper::GenerateCompareFlatOneByteStrings(masm, left, right, tmp1,
-                                                    tmp2, tmp3, tmp4);
+                                                    tmp2, tmp3);
   }
 
   // Handle more complex cases in runtime.
   __ bind(&runtime);
   __ Push(left, right);
   if (equality) {
     __ TailCallRuntime(Runtime::kStringEquals, 2, 1);
   } else {
     __ TailCallRuntime(Runtime::kStringCompare, 2, 1);
   }
 
   __ bind(&miss);
   GenerateMiss(masm);
 }
 
 
 void CompareICStub::GenerateObjects(MacroAssembler* masm) {
   DCHECK(state() == CompareICState::OBJECT);
   Label miss;
-  __ and_(r2, r1, Operand(r0));
-  __ JumpIfSmi(r2, &miss);
+  __ and_(r5, r4, r3);
+  __ JumpIfSmi(r5, &miss);
 
-  __ CompareObjectType(r0, r2, r2, JS_OBJECT_TYPE);
-  __ b(ne, &miss);
-  __ CompareObjectType(r1, r2, r2, JS_OBJECT_TYPE);
-  __ b(ne, &miss);
+  __ CompareObjectType(r3, r5, r5, JS_OBJECT_TYPE);
+  __ bne(&miss);
+  __ CompareObjectType(r4, r5, r5, JS_OBJECT_TYPE);
+  __ bne(&miss);
 
   DCHECK(GetCondition() == eq);
-  __ sub(r0, r0, Operand(r1));
+  __ sub(r3, r3, r4);
   __ Ret();
 
   __ bind(&miss);
   GenerateMiss(masm);
 }
 
 
 void CompareICStub::GenerateKnownObjects(MacroAssembler* masm) {
   Label miss;
-  __ and_(r2, r1, Operand(r0));
-  __ JumpIfSmi(r2, &miss);
-  __ ldr(r2, FieldMemOperand(r0, HeapObject::kMapOffset));
-  __ ldr(r3, FieldMemOperand(r1, HeapObject::kMapOffset));
-  __ cmp(r2, Operand(known_map_));
-  __ b(ne, &miss);
-  __ cmp(r3, Operand(known_map_));
-  __ b(ne, &miss);
+  __ and_(r5, r4, r3);
+  __ JumpIfSmi(r5, &miss);
+  __ LoadP(r5, FieldMemOperand(r3, HeapObject::kMapOffset));
+  __ LoadP(r6, FieldMemOperand(r4, HeapObject::kMapOffset));
+  __ Cmpi(r5, Operand(known_map_), r0);
+  __ bne(&miss);
+  __ Cmpi(r6, Operand(known_map_), r0);
+  __ bne(&miss);
 
-  __ sub(r0, r0, Operand(r1));
+  __ sub(r3, r3, r4);
   __ Ret();
 
   __ bind(&miss);
   GenerateMiss(masm);
 }
 
 
 void CompareICStub::GenerateMiss(MacroAssembler* masm) {
   {
     // Call the runtime system in a fresh internal frame.
     ExternalReference miss =
         ExternalReference(IC_Utility(IC::kCompareIC_Miss), isolate());
 
     FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
-    __ Push(r1, r0);
-    __ Push(lr, r1, r0);
-    __ mov(ip, Operand(Smi::FromInt(op())));
-    __ push(ip);
+    __ Push(r4, r3);
+    __ Push(r4, r3);
+    __ LoadSmiLiteral(r0, Smi::FromInt(op()));
+    __ push(r0);
     __ CallExternalReference(miss, 3);
     // Compute the entry point of the rewritten stub.
-    __ add(r2, r0, Operand(Code::kHeaderSize - kHeapObjectTag));
+    __ addi(r5, r3, Operand(Code::kHeaderSize - kHeapObjectTag));
     // Restore registers.
-    __ pop(lr);
-    __ Pop(r1, r0);
+    __ Pop(r4, r3);
   }
 
-  __ Jump(r2);
+  __ JumpToJSEntry(r5);
 }
 
 
+// This stub is paired with DirectCEntryStub::GenerateCall
 void DirectCEntryStub::Generate(MacroAssembler* masm) {
   // Place the return address on the stack, making the call
   // GC safe. The RegExp backend also relies on this.
-  __ str(lr, MemOperand(sp, 0));
-  __ blx(ip);  // Call the C++ function.
-  __ VFPEnsureFPSCRState(r2);
-  __ ldr(pc, MemOperand(sp, 0));
+  __ mflr(r0);
+  __ StoreP(r0, MemOperand(sp, kStackFrameExtraParamSlot * kPointerSize));
+  __ Call(ip);  // Call the C++ function.
+  __ LoadP(r0, MemOperand(sp, kStackFrameExtraParamSlot * kPointerSize));
+  __ mtlr(r0);
+  __ blr();
 }
 
 
-void DirectCEntryStub::GenerateCall(MacroAssembler* masm,
-                                    Register target) {
-  intptr_t code =
-      reinterpret_cast<intptr_t>(GetCode().location());
+void DirectCEntryStub::GenerateCall(MacroAssembler* masm, Register target) {
+#if ABI_USES_FUNCTION_DESCRIPTORS && !defined(USE_SIMULATOR)
+  // Native AIX/PPC64 Linux use a function descriptor.
+  __ LoadP(ToRegister(ABI_TOC_REGISTER), MemOperand(target, kPointerSize));
+  __ LoadP(ip, MemOperand(target, 0));  // Instruction address
+#else
+  // ip needs to be set for DirectCEentryStub::Generate, and also
+  // for ABI_TOC_ADDRESSABILITY_VIA_IP.
   __ Move(ip, target);
-  __ mov(lr, Operand(code, RelocInfo::CODE_TARGET));
-  __ blx(lr);  // Call the stub.
+#endif
+
+  intptr_t code = reinterpret_cast<intptr_t>(GetCode().location());
+  __ mov(r0, Operand(code, RelocInfo::CODE_TARGET));
+  __ Call(r0);  // Call the stub.
 }
 
 
-void NameDictionaryLookupStub::GenerateNegativeLookup(MacroAssembler* masm,
-                                                      Label* miss,
-                                                      Label* done,
-                                                      Register receiver,
-                                                      Register properties,
-                                                      Handle<Name> name,
-                                                      Register scratch0) {
+void NameDictionaryLookupStub::GenerateNegativeLookup(
+    MacroAssembler* masm, Label* miss, Label* done, Register receiver,
+    Register properties, Handle<Name> name, Register scratch0) {
   DCHECK(name->IsUniqueName());
   // If names of slots in range from 1 to kProbes - 1 for the hash value are
   // not equal to the name and kProbes-th slot is not used (its name is the
   // undefined value), it guarantees the hash table doesn't contain the
   // property. It's true even if some slots represent deleted properties
   // (their names are the hole value).
   for (int i = 0; i < kInlinedProbes; i++) {
     // scratch0 points to properties hash.
     // Compute the masked index: (hash + i + i * i) & mask.
     Register index = scratch0;
     // Capacity is smi 2^n.
-    __ ldr(index, FieldMemOperand(properties, kCapacityOffset));
-    __ sub(index, index, Operand(1));
-    __ and_(index, index, Operand(
-        Smi::FromInt(name->Hash() + NameDictionary::GetProbeOffset(i))));
+    __ LoadP(index, FieldMemOperand(properties, kCapacityOffset));
+    __ subi(index, index, Operand(1));
+    __ LoadSmiLiteral(
+        ip, Smi::FromInt(name->Hash() + NameDictionary::GetProbeOffset(i)));
+    __ and_(index, index, ip);
 
     // Scale the index by multiplying by the entry size.
     DCHECK(NameDictionary::kEntrySize == 3);
-    __ add(index, index, Operand(index, LSL, 1));  // index *= 3.
+    __ ShiftLeftImm(ip, index, Operand(1));
+    __ add(index, index, ip);  // index *= 3.
 
     Register entity_name = scratch0;
     // Having undefined at this place means the name is not contained.
-    DCHECK_EQ(kSmiTagSize, 1);
     Register tmp = properties;
-    __ add(tmp, properties, Operand(index, LSL, 1));
-    __ ldr(entity_name, FieldMemOperand(tmp, kElementsStartOffset));
+    __ SmiToPtrArrayOffset(ip, index);
+    __ add(tmp, properties, ip);
+    __ LoadP(entity_name, FieldMemOperand(tmp, kElementsStartOffset));
 
     DCHECK(!tmp.is(entity_name));
     __ LoadRoot(tmp, Heap::kUndefinedValueRootIndex);
     __ cmp(entity_name, tmp);
-    __ b(eq, done);
+    __ beq(done);
 
     // Load the hole ready for use below:
     __ LoadRoot(tmp, Heap::kTheHoleValueRootIndex);
 
     // Stop if found the property.
-    __ cmp(entity_name, Operand(Handle<Name>(name)));
-    __ b(eq, miss);
+    __ Cmpi(entity_name, Operand(Handle<Name>(name)), r0);
+    __ beq(miss);
 
     Label good;
     __ cmp(entity_name, tmp);
-    __ b(eq, &good);
+    __ beq(&good);
 
     // Check if the entry name is not a unique name.
-    __ ldr(entity_name, FieldMemOperand(entity_name, HeapObject::kMapOffset));
-    __ ldrb(entity_name,
-            FieldMemOperand(entity_name, Map::kInstanceTypeOffset));
-    __ JumpIfNotUniqueName(entity_name, miss);
+    __ LoadP(entity_name, FieldMemOperand(entity_name, HeapObject::kMapOffset));
+    __ lbz(entity_name, FieldMemOperand(entity_name, Map::kInstanceTypeOffset));
+    __ JumpIfNotUniqueNameInstanceType(entity_name, miss);
     __ bind(&good);
 
     // Restore the properties.
-    __ ldr(properties,
-           FieldMemOperand(receiver, JSObject::kPropertiesOffset));
+    __ LoadP(properties,
+             FieldMemOperand(receiver, JSObject::kPropertiesOffset));
   }
 
-  const int spill_mask =
-      (lr.bit() | r6.bit() | r5.bit() | r4.bit() | r3.bit() |
-       r2.bit() | r1.bit() | r0.bit());
+  const int spill_mask = (r0.bit() | r9.bit() | r8.bit() | r7.bit() | r6.bit() |
+                          r5.bit() | r4.bit() | r3.bit());
 
-  __ stm(db_w, sp, spill_mask);
-  __ ldr(r0, FieldMemOperand(receiver, JSObject::kPropertiesOffset));
-  __ mov(r1, Operand(Handle<Name>(name)));
+  __ mflr(r0);
+  __ MultiPush(spill_mask);
+
+  __ LoadP(r3, FieldMemOperand(receiver, JSObject::kPropertiesOffset));
+  __ mov(r4, Operand(Handle<Name>(name)));
   NameDictionaryLookupStub stub(masm->isolate(), NEGATIVE_LOOKUP);
   __ CallStub(&stub);
-  __ cmp(r0, Operand::Zero());
-  __ ldm(ia_w, sp, spill_mask);
+  __ cmpi(r3, Operand::Zero());
 
-  __ b(eq, done);
-  __ b(ne, miss);
+  __ MultiPop(spill_mask);  // MultiPop does not touch condition flags
+  __ mtlr(r0);
+
+  __ beq(done);
+  __ bne(miss);
 }
 
 
 // Probe the name dictionary in the |elements| register. Jump to the
 // |done| label if a property with the given name is found. Jump to
 // the |miss| label otherwise.
 // If lookup was successful |scratch2| will be equal to elements + 4 * index.
-void NameDictionaryLookupStub::GeneratePositiveLookup(MacroAssembler* masm,
-                                                      Label* miss,
-                                                      Label* done,
-                                                      Register elements,
-                                                      Register name,
-                                                      Register scratch1,
-                                                      Register scratch2) {
+void NameDictionaryLookupStub::GeneratePositiveLookup(
+    MacroAssembler* masm, Label* miss, Label* done, Register elements,
+    Register name, Register scratch1, Register scratch2) {
   DCHECK(!elements.is(scratch1));
   DCHECK(!elements.is(scratch2));
   DCHECK(!name.is(scratch1));
   DCHECK(!name.is(scratch2));
 
   __ AssertName(name);
 
   // Compute the capacity mask.
-  __ ldr(scratch1, FieldMemOperand(elements, kCapacityOffset));
-  __ SmiUntag(scratch1);
-  __ sub(scratch1, scratch1, Operand(1));
+  __ LoadP(scratch1, FieldMemOperand(elements, kCapacityOffset));
+  __ SmiUntag(scratch1);  // convert smi to int
+  __ subi(scratch1, scratch1, Operand(1));
 
   // Generate an unrolled loop that performs a few probes before
   // giving up. Measurements done on Gmail indicate that 2 probes
   // cover ~93% of loads from dictionaries.
   for (int i = 0; i < kInlinedProbes; i++) {
     // Compute the masked index: (hash + i + i * i) & mask.
-    __ ldr(scratch2, FieldMemOperand(name, Name::kHashFieldOffset));
+    __ lwz(scratch2, FieldMemOperand(name, Name::kHashFieldOffset));
     if (i > 0) {
       // Add the probe offset (i + i * i) left shifted to avoid right shifting
       // the hash in a separate instruction. The value hash + i + i * i is right
       // shifted in the following and instruction.
       DCHECK(NameDictionary::GetProbeOffset(i) <
              1 << (32 - Name::kHashFieldOffset));
-      __ add(scratch2, scratch2, Operand(
-          NameDictionary::GetProbeOffset(i) << Name::kHashShift));
+      __ addi(scratch2, scratch2,
+              Operand(NameDictionary::GetProbeOffset(i) << Name::kHashShift));
     }
-    __ and_(scratch2, scratch1, Operand(scratch2, LSR, Name::kHashShift));
+    __ srwi(scratch2, scratch2, Operand(Name::kHashShift));
+    __ and_(scratch2, scratch1, scratch2);
 
     // Scale the index by multiplying by the element size.
     DCHECK(NameDictionary::kEntrySize == 3);
     // scratch2 = scratch2 * 3.
-    __ add(scratch2, scratch2, Operand(scratch2, LSL, 1));
+    __ ShiftLeftImm(ip, scratch2, Operand(1));
+    __ add(scratch2, scratch2, ip);
 
     // Check if the key is identical to the name.
-    __ add(scratch2, elements, Operand(scratch2, LSL, 2));
-    __ ldr(ip, FieldMemOperand(scratch2, kElementsStartOffset));
-    __ cmp(name, Operand(ip));
-    __ b(eq, done);
+    __ ShiftLeftImm(ip, scratch2, Operand(kPointerSizeLog2));
+    __ add(scratch2, elements, ip);
+    __ LoadP(ip, FieldMemOperand(scratch2, kElementsStartOffset));
+    __ cmp(name, ip);
+    __ beq(done);
   }
 
-  const int spill_mask =
-      (lr.bit() | r6.bit() | r5.bit() | r4.bit() |
-       r3.bit() | r2.bit() | r1.bit() | r0.bit()) &
-      ~(scratch1.bit() | scratch2.bit());
+  const int spill_mask = (r0.bit() | r9.bit() | r8.bit() | r7.bit() | r6.bit() |
+                          r5.bit() | r4.bit() | r3.bit()) &
+                         ~(scratch1.bit() | scratch2.bit());
 
-  __ stm(db_w, sp, spill_mask);
-  if (name.is(r0)) {
-    DCHECK(!elements.is(r1));
-    __ Move(r1, name);
-    __ Move(r0, elements);
+  __ mflr(r0);
+  __ MultiPush(spill_mask);
+  if (name.is(r3)) {
+    DCHECK(!elements.is(r4));
+    __ mr(r4, name);
+    __ mr(r3, elements);
   } else {
-    __ Move(r0, elements);
-    __ Move(r1, name);
+    __ mr(r3, elements);
+    __ mr(r4, name);
   }
   NameDictionaryLookupStub stub(masm->isolate(), POSITIVE_LOOKUP);
   __ CallStub(&stub);
-  __ cmp(r0, Operand::Zero());
-  __ mov(scratch2, Operand(r2));
-  __ ldm(ia_w, sp, spill_mask);
+  __ cmpi(r3, Operand::Zero());
+  __ mr(scratch2, r5);
+  __ MultiPop(spill_mask);
+  __ mtlr(r0);
 
-  __ b(ne, done);
-  __ b(eq, miss);
+  __ bne(done);
+  __ beq(miss);
 }
 
 
 void NameDictionaryLookupStub::Generate(MacroAssembler* masm) {
   // This stub overrides SometimesSetsUpAFrame() to return false.  That means
   // we cannot call anything that could cause a GC from this stub.
   // Registers:
   //  result: NameDictionary to probe
-  //  r1: key
+  //  r4: key
   //  dictionary: NameDictionary to probe.
   //  index: will hold an index of entry if lookup is successful.
   //         might alias with result_.
   // Returns:
   //  result_ is zero if lookup failed, non zero otherwise.
 
-  Register result = r0;
-  Register dictionary = r0;
-  Register key = r1;
-  Register index = r2;
-  Register mask = r3;
-  Register hash = r4;
-  Register undefined = r5;
-  Register entry_key = r6;
+  Register result = r3;
+  Register dictionary = r3;
+  Register key = r4;
+  Register index = r5;
+  Register mask = r6;
+  Register hash = r7;
+  Register undefined = r8;
+  Register entry_key = r9;
+  Register scratch = r9;
 
   Label in_dictionary, maybe_in_dictionary, not_in_dictionary;
 
-  __ ldr(mask, FieldMemOperand(dictionary, kCapacityOffset));
+  __ LoadP(mask, FieldMemOperand(dictionary, kCapacityOffset));
   __ SmiUntag(mask);
-  __ sub(mask, mask, Operand(1));
+  __ subi(mask, mask, Operand(1));
 
-  __ ldr(hash, FieldMemOperand(key, Name::kHashFieldOffset));
+  __ lwz(hash, FieldMemOperand(key, Name::kHashFieldOffset));
 
   __ LoadRoot(undefined, Heap::kUndefinedValueRootIndex);
 
   for (int i = kInlinedProbes; i < kTotalProbes; i++) {
     // Compute the masked index: (hash + i + i * i) & mask.
     // Capacity is smi 2^n.
     if (i > 0) {
       // Add the probe offset (i + i * i) left shifted to avoid right shifting
       // the hash in a separate instruction. The value hash + i + i * i is right
       // shifted in the following and instruction.
       DCHECK(NameDictionary::GetProbeOffset(i) <
              1 << (32 - Name::kHashFieldOffset));
-      __ add(index, hash, Operand(
-          NameDictionary::GetProbeOffset(i) << Name::kHashShift));
+      __ addi(index, hash,
+              Operand(NameDictionary::GetProbeOffset(i) << Name::kHashShift));
     } else {
-      __ mov(index, Operand(hash));
+      __ mr(index, hash);
     }
-    __ and_(index, mask, Operand(index, LSR, Name::kHashShift));
+    __ srwi(r0, index, Operand(Name::kHashShift));
+    __ and_(index, mask, r0);
 
     // Scale the index by multiplying by the entry size.
     DCHECK(NameDictionary::kEntrySize == 3);
-    __ add(index, index, Operand(index, LSL, 1));  // index *= 3.
+    __ ShiftLeftImm(scratch, index, Operand(1));
+    __ add(index, index, scratch);  // index *= 3.
 
     DCHECK_EQ(kSmiTagSize, 1);
-    __ add(index, dictionary, Operand(index, LSL, 2));
-    __ ldr(entry_key, FieldMemOperand(index, kElementsStartOffset));
+    __ ShiftLeftImm(scratch, index, Operand(kPointerSizeLog2));
+    __ add(index, dictionary, scratch);
+    __ LoadP(entry_key, FieldMemOperand(index, kElementsStartOffset));
 
     // Having undefined at this place means the name is not contained.
-    __ cmp(entry_key, Operand(undefined));
-    __ b(eq, &not_in_dictionary);
+    __ cmp(entry_key, undefined);
+    __ beq(&not_in_dictionary);
 
     // Stop if found the property.
-    __ cmp(entry_key, Operand(key));
-    __ b(eq, &in_dictionary);
+    __ cmp(entry_key, key);
+    __ beq(&in_dictionary);
 
     if (i != kTotalProbes - 1 && mode() == NEGATIVE_LOOKUP) {
       // Check if the entry name is not a unique name.
-      __ ldr(entry_key, FieldMemOperand(entry_key, HeapObject::kMapOffset));
-      __ ldrb(entry_key,
-              FieldMemOperand(entry_key, Map::kInstanceTypeOffset));
-      __ JumpIfNotUniqueName(entry_key, &maybe_in_dictionary);
+      __ LoadP(entry_key, FieldMemOperand(entry_key, HeapObject::kMapOffset));
+      __ lbz(entry_key, FieldMemOperand(entry_key, Map::kInstanceTypeOffset));
+      __ JumpIfNotUniqueNameInstanceType(entry_key, &maybe_in_dictionary);
     }
   }
 
   __ bind(&maybe_in_dictionary);
   // If we are doing negative lookup then probing failure should be
   // treated as a lookup success. For positive lookup probing failure
   // should be treated as lookup failure.
   if (mode() == POSITIVE_LOOKUP) {
-    __ mov(result, Operand::Zero());
+    __ li(result, Operand::Zero());
     __ Ret();
   }
 
   __ bind(&in_dictionary);
-  __ mov(result, Operand(1));
+  __ li(result, Operand(1));
   __ Ret();
 
   __ bind(&not_in_dictionary);
-  __ mov(result, Operand::Zero());
+  __ li(result, Operand::Zero());
   __ Ret();
 }
 
 
 void StoreBufferOverflowStub::GenerateFixedRegStubsAheadOfTime(
     Isolate* isolate) {
   StoreBufferOverflowStub stub1(isolate, kDontSaveFPRegs);
   stub1.GetCode();
   // Hydrogen code stubs need stub2 at snapshot time.
   StoreBufferOverflowStub stub2(isolate, kSaveFPRegs);
   stub2.GetCode();
 }
 
 
 // Takes the input in 3 registers: address_ value_ and object_.  A pointer to
 // the value has just been written into the object, now this stub makes sure
 // we keep the GC informed.  The word in the object where the value has been
 // written is in the address register.
 void RecordWriteStub::Generate(MacroAssembler* masm) {
   Label skip_to_incremental_noncompacting;
   Label skip_to_incremental_compacting;
 
-  // The first two instructions are generated with labels so as to get the
-  // offset fixed up correctly by the bind(Label*) call.  We patch it back and
-  // forth between a compare instructions (a nop in this position) and the
-  // real branch when we start and stop incremental heap marking.
+  // The first two branch instructions are generated with labels so as to
+  // get the offset fixed up correctly by the bind(Label*) call.  We patch
+  // it back and forth between branch condition True and False
+  // when we start and stop incremental heap marking.
   // See RecordWriteStub::Patch for details.
-  {
-    // Block literal pool emission, as the position of these two instructions
-    // is assumed by the patching code.
-    Assembler::BlockConstPoolScope block_const_pool(masm);
-    __ b(&skip_to_incremental_noncompacting);
-    __ b(&skip_to_incremental_compacting);
-  }
+
+  // Clear the bit, branch on True for NOP action initially
+  __ crclr(Assembler::encode_crbit(cr2, CR_LT));
+  __ blt(&skip_to_incremental_noncompacting, cr2);
+  __ blt(&skip_to_incremental_compacting, cr2);
 
   if (remembered_set_action() == EMIT_REMEMBERED_SET) {
     __ RememberedSetHelper(object(), address(), value(), save_fp_regs_mode(),
                            MacroAssembler::kReturnAtEnd);
   }
   __ Ret();
 
   __ bind(&skip_to_incremental_noncompacting);
   GenerateIncremental(masm, INCREMENTAL);
 
   __ bind(&skip_to_incremental_compacting);
   GenerateIncremental(masm, INCREMENTAL_COMPACTION);
 
   // Initial mode of the stub is expected to be STORE_BUFFER_ONLY.
   // Will be checked in IncrementalMarking::ActivateGeneratedStub.
-  DCHECK(Assembler::GetBranchOffset(masm->instr_at(0)) < (1 << 12));
-  DCHECK(Assembler::GetBranchOffset(masm->instr_at(4)) < (1 << 12));
-  PatchBranchIntoNop(masm, 0);
-  PatchBranchIntoNop(masm, Assembler::kInstrSize);
+  // patching not required on PPC as the initial path is effectively NOP
 }
 
 
 void RecordWriteStub::GenerateIncremental(MacroAssembler* masm, Mode mode) {
   regs_.Save(masm);
 
   if (remembered_set_action() == EMIT_REMEMBERED_SET) {
     Label dont_need_remembered_set;
 
-    __ ldr(regs_.scratch0(), MemOperand(regs_.address(), 0));
+    __ LoadP(regs_.scratch0(), MemOperand(regs_.address(), 0));
     __ JumpIfNotInNewSpace(regs_.scratch0(),  // Value.
-                           regs_.scratch0(),
-                           &dont_need_remembered_set);
+                           regs_.scratch0(), &dont_need_remembered_set);
 
-    __ CheckPageFlag(regs_.object(),
-                     regs_.scratch0(),
-                     1 << MemoryChunk::SCAN_ON_SCAVENGE,
-                     ne,
+    __ CheckPageFlag(regs_.object(), regs_.scratch0(),
+                     1 << MemoryChunk::SCAN_ON_SCAVENGE, ne,
                      &dont_need_remembered_set);
 
     // First notify the incremental marker if necessary, then update the
     // remembered set.
     CheckNeedsToInformIncrementalMarker(
         masm, kUpdateRememberedSetOnNoNeedToInformIncrementalMarker, mode);
     InformIncrementalMarker(masm);
     regs_.Restore(masm);
     __ RememberedSetHelper(object(), address(), value(), save_fp_regs_mode(),
                            MacroAssembler::kReturnAtEnd);
 
     __ bind(&dont_need_remembered_set);
   }
 
   CheckNeedsToInformIncrementalMarker(
       masm, kReturnOnNoNeedToInformIncrementalMarker, mode);
   InformIncrementalMarker(masm);
   regs_.Restore(masm);
   __ Ret();
 }
 
 
 void RecordWriteStub::InformIncrementalMarker(MacroAssembler* masm) {
   regs_.SaveCallerSaveRegisters(masm, save_fp_regs_mode());
   int argument_count = 3;
   __ PrepareCallCFunction(argument_count, regs_.scratch0());
   Register address =
-      r0.is(regs_.address()) ? regs_.scratch0() : regs_.address();
+      r3.is(regs_.address()) ? regs_.scratch0() : regs_.address();
   DCHECK(!address.is(regs_.object()));
-  DCHECK(!address.is(r0));
-  __ Move(address, regs_.address());
-  __ Move(r0, regs_.object());
-  __ Move(r1, address);
-  __ mov(r2, Operand(ExternalReference::isolate_address(isolate())));
+  DCHECK(!address.is(r3));
+  __ mr(address, regs_.address());
+  __ mr(r3, regs_.object());
+  __ mr(r4, address);
+  __ mov(r5, Operand(ExternalReference::isolate_address(isolate())));
 
   AllowExternalCallThatCantCauseGC scope(masm);
   __ CallCFunction(
       ExternalReference::incremental_marking_record_write_function(isolate()),
       argument_count);
   regs_.RestoreCallerSaveRegisters(masm, save_fp_regs_mode());
 }
 
 
 void RecordWriteStub::CheckNeedsToInformIncrementalMarker(
-    MacroAssembler* masm,
-    OnNoNeedToInformIncrementalMarker on_no_need,
+    MacroAssembler* masm, OnNoNeedToInformIncrementalMarker on_no_need,
     Mode mode) {
   Label on_black;
   Label need_incremental;
   Label need_incremental_pop_scratch;
 
-  __ and_(regs_.scratch0(), regs_.object(), Operand(~Page::kPageAlignmentMask));
-  __ ldr(regs_.scratch1(),
-         MemOperand(regs_.scratch0(),
-                    MemoryChunk::kWriteBarrierCounterOffset));
-  __ sub(regs_.scratch1(), regs_.scratch1(), Operand(1), SetCC);
-  __ str(regs_.scratch1(),
-         MemOperand(regs_.scratch0(),
-                    MemoryChunk::kWriteBarrierCounterOffset));
-  __ b(mi, &need_incremental);
+  DCHECK((~Page::kPageAlignmentMask & 0xffff) == 0);
+  __ lis(r0, Operand((~Page::kPageAlignmentMask >> 16)));
+  __ and_(regs_.scratch0(), regs_.object(), r0);
+  __ LoadP(
+      regs_.scratch1(),
+      MemOperand(regs_.scratch0(), MemoryChunk::kWriteBarrierCounterOffset));
+  __ subi(regs_.scratch1(), regs_.scratch1(), Operand(1));
+  __ StoreP(
+      regs_.scratch1(),
+      MemOperand(regs_.scratch0(), MemoryChunk::kWriteBarrierCounterOffset));
+  __ cmpi(regs_.scratch1(), Operand::Zero());  // PPC, we could do better here
+  __ blt(&need_incremental);
 
   // Let's look at the color of the object:  If it is not black we don't have
   // to inform the incremental marker.
   __ JumpIfBlack(regs_.object(), regs_.scratch0(), regs_.scratch1(), &on_black);
 
   regs_.Restore(masm);
   if (on_no_need == kUpdateRememberedSetOnNoNeedToInformIncrementalMarker) {
     __ RememberedSetHelper(object(), address(), value(), save_fp_regs_mode(),
                            MacroAssembler::kReturnAtEnd);
   } else {
     __ Ret();
   }
 
   __ bind(&on_black);
 
   // Get the value from the slot.
-  __ ldr(regs_.scratch0(), MemOperand(regs_.address(), 0));
+  __ LoadP(regs_.scratch0(), MemOperand(regs_.address(), 0));
 
   if (mode == INCREMENTAL_COMPACTION) {
     Label ensure_not_white;
 
     __ CheckPageFlag(regs_.scratch0(),  // Contains value.
                      regs_.scratch1(),  // Scratch.
-                     MemoryChunk::kEvacuationCandidateMask,
-                     eq,
+                     MemoryChunk::kEvacuationCandidateMask, eq,
                      &ensure_not_white);
 
     __ CheckPageFlag(regs_.object(),
                      regs_.scratch1(),  // Scratch.
-                     MemoryChunk::kSkipEvacuationSlotsRecordingMask,
-                     eq,
+                     MemoryChunk::kSkipEvacuationSlotsRecordingMask, eq,
                      &need_incremental);
 
     __ bind(&ensure_not_white);
   }
 
   // We need extra registers for this, so we push the object and the address
   // register temporarily.
   __ Push(regs_.object(), regs_.address());
   __ EnsureNotWhite(regs_.scratch0(),  // The value.
                     regs_.scratch1(),  // Scratch.
-                    regs_.object(),  // Scratch.
-                    regs_.address(),  // Scratch.
+                    regs_.object(),    // Scratch.
+                    regs_.address(),   // Scratch.
                     &need_incremental_pop_scratch);
   __ Pop(regs_.object(), regs_.address());
 
   regs_.Restore(masm);
   if (on_no_need == kUpdateRememberedSetOnNoNeedToInformIncrementalMarker) {
     __ RememberedSetHelper(object(), address(), value(), save_fp_regs_mode(),
                            MacroAssembler::kReturnAtEnd);
   } else {
     __ Ret();
   }
 
   __ bind(&need_incremental_pop_scratch);
   __ Pop(regs_.object(), regs_.address());
 
   __ bind(&need_incremental);
 
   // Fall through when we need to inform the incremental marker.
 }
 
 
 void StoreArrayLiteralElementStub::Generate(MacroAssembler* masm) {
   // ----------- S t a t e -------------
-  //  -- r0    : element value to store
-  //  -- r3    : element index as smi
+  //  -- r3    : element value to store
+  //  -- r6    : element index as smi
   //  -- sp[0] : array literal index in function as smi
   //  -- sp[4] : array literal
-  // clobbers r1, r2, r4
+  // clobbers r3, r5, r7
   // -----------------------------------
 
   Label element_done;
   Label double_elements;
   Label smi_element;
   Label slow_elements;
   Label fast_elements;
 
   // Get array literal index, array literal and its map.
-  __ ldr(r4, MemOperand(sp, 0 * kPointerSize));
-  __ ldr(r1, MemOperand(sp, 1 * kPointerSize));
-  __ ldr(r2, FieldMemOperand(r1, JSObject::kMapOffset));
+  __ LoadP(r7, MemOperand(sp, 0 * kPointerSize));
+  __ LoadP(r4, MemOperand(sp, 1 * kPointerSize));
+  __ LoadP(r5, FieldMemOperand(r4, JSObject::kMapOffset));
 
-  __ CheckFastElements(r2, r5, &double_elements);
+  __ CheckFastElements(r5, r8, &double_elements);
   // FAST_*_SMI_ELEMENTS or FAST_*_ELEMENTS
-  __ JumpIfSmi(r0, &smi_element);
-  __ CheckFastSmiElements(r2, r5, &fast_elements);
+  __ JumpIfSmi(r3, &smi_element);
+  __ CheckFastSmiElements(r5, r8, &fast_elements);
 
   // Store into the array literal requires a elements transition. Call into
   // the runtime.
   __ bind(&slow_elements);
   // call.
-  __ Push(r1, r3, r0);
-  __ ldr(r5, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
-  __ ldr(r5, FieldMemOperand(r5, JSFunction::kLiteralsOffset));
-  __ Push(r5, r4);
+  __ Push(r4, r6, r3);
+  __ LoadP(r8, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+  __ LoadP(r8, FieldMemOperand(r8, JSFunction::kLiteralsOffset));
+  __ Push(r8, r7);
   __ TailCallRuntime(Runtime::kStoreArrayLiteralElement, 5, 1);
 
   // Array literal has ElementsKind of FAST_*_ELEMENTS and value is an object.
   __ bind(&fast_elements);
-  __ ldr(r5, FieldMemOperand(r1, JSObject::kElementsOffset));
-  __ add(r6, r5, Operand::PointerOffsetFromSmiKey(r3));
-  __ add(r6, r6, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
-  __ str(r0, MemOperand(r6, 0));
+  __ LoadP(r8, FieldMemOperand(r4, JSObject::kElementsOffset));
+  __ SmiToPtrArrayOffset(r9, r6);
+  __ add(r9, r8, r9);
+#if V8_TARGET_ARCH_PPC64
+  // add due to offset alignment requirements of StorePU
+  __ addi(r9, r9, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
+  __ StoreP(r3, MemOperand(r9));
+#else
+  __ StorePU(r3, MemOperand(r9, FixedArray::kHeaderSize - kHeapObjectTag));
+#endif
   // Update the write barrier for the array store.
-  __ RecordWrite(r5, r6, r0, kLRHasNotBeenSaved, kDontSaveFPRegs,
+  __ RecordWrite(r8, r9, r3, kLRHasNotBeenSaved, kDontSaveFPRegs,
                  EMIT_REMEMBERED_SET, OMIT_SMI_CHECK);
   __ Ret();
 
   // Array literal has ElementsKind of FAST_*_SMI_ELEMENTS or FAST_*_ELEMENTS,
   // and value is Smi.
   __ bind(&smi_element);
-  __ ldr(r5, FieldMemOperand(r1, JSObject::kElementsOffset));
-  __ add(r6, r5, Operand::PointerOffsetFromSmiKey(r3));
-  __ str(r0, FieldMemOperand(r6, FixedArray::kHeaderSize));
+  __ LoadP(r8, FieldMemOperand(r4, JSObject::kElementsOffset));
+  __ SmiToPtrArrayOffset(r9, r6);
+  __ add(r9, r8, r9);
+  __ StoreP(r3, FieldMemOperand(r9, FixedArray::kHeaderSize), r0);
   __ Ret();
 
   // Array literal has ElementsKind of FAST_DOUBLE_ELEMENTS.
   __ bind(&double_elements);
-  __ ldr(r5, FieldMemOperand(r1, JSObject::kElementsOffset));
-  __ StoreNumberToDoubleElements(r0, r3, r5, r6, d0, &slow_elements);
+  __ LoadP(r8, FieldMemOperand(r4, JSObject::kElementsOffset));
+  __ StoreNumberToDoubleElements(r3, r6, r8, r9, d0, &slow_elements);
   __ Ret();
 }
 
 
 void StubFailureTrampolineStub::Generate(MacroAssembler* masm) {
   CEntryStub ces(isolate(), 1, kSaveFPRegs);
   __ Call(ces.GetCode(), RelocInfo::CODE_TARGET);
   int parameter_count_offset =
       StubFailureTrampolineFrame::kCallerStackParameterCountFrameOffset;
-  __ ldr(r1, MemOperand(fp, parameter_count_offset));
+  __ LoadP(r4, MemOperand(fp, parameter_count_offset));
   if (function_mode() == JS_FUNCTION_STUB_MODE) {
-    __ add(r1, r1, Operand(1));
+    __ addi(r4, r4, Operand(1));
   }
   masm->LeaveFrame(StackFrame::STUB_FAILURE_TRAMPOLINE);
-  __ mov(r1, Operand(r1, LSL, kPointerSizeLog2));
-  __ add(sp, sp, r1);
+  __ slwi(r4, r4, Operand(kPointerSizeLog2));
+  __ add(sp, sp, r4);
   __ Ret();
 }
 
 
 void LoadICTrampolineStub::Generate(MacroAssembler* masm) {
   EmitLoadTypeFeedbackVector(masm, VectorLoadICDescriptor::VectorRegister());
   VectorLoadStub stub(isolate(), state());
   __ Jump(stub.GetCode(), RelocInfo::CODE_TARGET);
 }
 
 
 void KeyedLoadICTrampolineStub::Generate(MacroAssembler* masm) {
   EmitLoadTypeFeedbackVector(masm, VectorLoadICDescriptor::VectorRegister());
   VectorKeyedLoadStub stub(isolate());
   __ Jump(stub.GetCode(), RelocInfo::CODE_TARGET);
 }
 
 
 void ProfileEntryHookStub::MaybeCallEntryHook(MacroAssembler* masm) {
   if (masm->isolate()->function_entry_hook() != NULL) {
+    PredictableCodeSizeScope predictable(masm,
+#if V8_TARGET_ARCH_PPC64
+                                         14 * Assembler::kInstrSize);
+#else
+                                         11 * Assembler::kInstrSize);
+#endif
     ProfileEntryHookStub stub(masm->isolate());
-    int code_size = masm->CallStubSize(&stub) + 2 * Assembler::kInstrSize;
-    PredictableCodeSizeScope predictable(masm, code_size);
-    __ push(lr);
+    __ mflr(r0);
+    __ Push(r0, ip);
     __ CallStub(&stub);
-    __ pop(lr);
+    __ Pop(r0, ip);
+    __ mtlr(r0);
   }
 }
 
 
 void ProfileEntryHookStub::Generate(MacroAssembler* masm) {
-  // The entry hook is a "push lr" instruction, followed by a call.
+  // The entry hook is a "push lr, ip" instruction, followed by a call.
   const int32_t kReturnAddressDistanceFromFunctionStart =
-      3 * Assembler::kInstrSize;
+      Assembler::kCallTargetAddressOffset + 3 * Assembler::kInstrSize;
 
-  // This should contain all kCallerSaved registers.
-  const RegList kSavedRegs =
-      1 <<  0 |  // r0
-      1 <<  1 |  // r1
-      1 <<  2 |  // r2
-      1 <<  3 |  // r3
-      1 <<  5 |  // r5
-      1 <<  9;   // r9
+  // This should contain all kJSCallerSaved registers.
+  const RegList kSavedRegs = kJSCallerSaved |  // Caller saved registers.
+                             r15.bit();        // Saved stack pointer.
+
   // We also save lr, so the count here is one higher than the mask indicates.
-  const int32_t kNumSavedRegs = 7;
-
-  DCHECK((kCallerSaved & kSavedRegs) == kCallerSaved);
+  const int32_t kNumSavedRegs = kNumJSCallerSaved + 2;
 
   // Save all caller-save registers as this may be called from anywhere.
-  __ stm(db_w, sp, kSavedRegs | lr.bit());
+  __ mflr(ip);
+  __ MultiPush(kSavedRegs | ip.bit());
 
   // Compute the function's address for the first argument.
-  __ sub(r0, lr, Operand(kReturnAddressDistanceFromFunctionStart));
+  __ subi(r3, ip, Operand(kReturnAddressDistanceFromFunctionStart));
 
-  // The caller's return address is above the saved temporaries.
+  // The caller's return address is two slots above the saved temporaries.
   // Grab that for the second argument to the hook.
-  __ add(r1, sp, Operand(kNumSavedRegs * kPointerSize));
+  __ addi(r4, sp, Operand((kNumSavedRegs + 1) * kPointerSize));
 
   // Align the stack if necessary.
   int frame_alignment = masm->ActivationFrameAlignment();
   if (frame_alignment > kPointerSize) {
-    __ mov(r5, sp);
+    __ mr(r15, sp);
     DCHECK(base::bits::IsPowerOfTwo32(frame_alignment));
-    __ and_(sp, sp, Operand(-frame_alignment));
+    __ ClearRightImm(sp, sp, Operand(WhichPowerOf2(frame_alignment)));
   }
 
-#if V8_HOST_ARCH_ARM
-  int32_t entry_hook =
-      reinterpret_cast<int32_t>(isolate()->function_entry_hook());
+#if !defined(USE_SIMULATOR)
+  uintptr_t entry_hook =
+      reinterpret_cast<uintptr_t>(isolate()->function_entry_hook());
   __ mov(ip, Operand(entry_hook));
+
+#if ABI_USES_FUNCTION_DESCRIPTORS

[danno, 2014/10/20 08:28:43]

Is it possible to use just an "if" and not "#if"?

[andrew_low, 2014/11/07 18:03:17]

Yes, but I've got the same comment as before. Yes, we'd run more code through
the compiler for a given bit size -- and it'd go an optimize the always false
case out, but this mostly seems like a code-style thing. 

At least this one is a much smaller set of changes we're talking about. Can you
state a more specific opinion on how much this matters?

+  // Function descriptor
+  __ LoadP(ToRegister(ABI_TOC_REGISTER), MemOperand(ip, kPointerSize));
+  __ LoadP(ip, MemOperand(ip, 0));
+#elif ABI_TOC_ADDRESSABILITY_VIA_IP
+// ip set above, so nothing to do.
+#endif
+
+  // PPC LINUX ABI:
+  __ li(r0, Operand::Zero());
+  __ StorePU(r0, MemOperand(sp, -kNumRequiredStackFrameSlots * kPointerSize));
 #else
   // Under the simulator we need to indirect the entry hook through a
   // trampoline function at a known address.
   // It additionally takes an isolate as a third parameter
-  __ mov(r2, Operand(ExternalReference::isolate_address(isolate())));
+  __ mov(r5, Operand(ExternalReference::isolate_address(isolate())));
 
   ApiFunction dispatcher(FUNCTION_ADDR(EntryHookTrampoline));
-  __ mov(ip, Operand(ExternalReference(&dispatcher,
-                                       ExternalReference::BUILTIN_CALL,
-                                       isolate())));
+  __ mov(ip, Operand(ExternalReference(
+                 &dispatcher, ExternalReference::BUILTIN_CALL, isolate())));
 #endif
   __ Call(ip);
 
+#if !defined(USE_SIMULATOR)
+  __ addi(sp, sp, Operand(kNumRequiredStackFrameSlots * kPointerSize));
+#endif
+
   // Restore the stack pointer if needed.
   if (frame_alignment > kPointerSize) {
-    __ mov(sp, r5);
+    __ mr(sp, r15);
   }
 
-  // Also pop pc to get Ret(0).
-  __ ldm(ia_w, sp, kSavedRegs | pc.bit());
+  // Also pop lr to get Ret(0).
+  __ MultiPop(kSavedRegs | ip.bit());
+  __ mtlr(ip);
+  __ Ret();
 }
 
 
-template<class T>
+template <class T>
 static void CreateArrayDispatch(MacroAssembler* masm,
                                 AllocationSiteOverrideMode mode) {
   if (mode == DISABLE_ALLOCATION_SITES) {
     T stub(masm->isolate(), GetInitialFastElementsKind(), mode);
     __ TailCallStub(&stub);
   } else if (mode == DONT_OVERRIDE) {
-    int last_index = GetSequenceIndexFromFastElementsKind(
-        TERMINAL_FAST_ELEMENTS_KIND);
+    int last_index =
+        GetSequenceIndexFromFastElementsKind(TERMINAL_FAST_ELEMENTS_KIND);
     for (int i = 0; i <= last_index; ++i) {
       ElementsKind kind = GetFastElementsKindFromSequenceIndex(i);
-      __ cmp(r3, Operand(kind));
+      __ Cmpi(r6, Operand(kind), r0);
       T stub(masm->isolate(), kind);
       __ TailCallStub(&stub, eq);
     }
 
     // If we reached this point there is a problem.
     __ Abort(kUnexpectedElementsKindInArrayConstructor);
   } else {
     UNREACHABLE();
   }
 }
 
 
 static void CreateArrayDispatchOneArgument(MacroAssembler* masm,
                                            AllocationSiteOverrideMode mode) {
-  // r2 - allocation site (if mode != DISABLE_ALLOCATION_SITES)
-  // r3 - kind (if mode != DISABLE_ALLOCATION_SITES)
-  // r0 - number of arguments
-  // r1 - constructor?
+  // r5 - allocation site (if mode != DISABLE_ALLOCATION_SITES)
+  // r6 - kind (if mode != DISABLE_ALLOCATION_SITES)
+  // r3 - number of arguments
+  // r4 - constructor?
   // sp[0] - last argument
   Label normal_sequence;
   if (mode == DONT_OVERRIDE) {
     DCHECK(FAST_SMI_ELEMENTS == 0);
     DCHECK(FAST_HOLEY_SMI_ELEMENTS == 1);
     DCHECK(FAST_ELEMENTS == 2);
     DCHECK(FAST_HOLEY_ELEMENTS == 3);
     DCHECK(FAST_DOUBLE_ELEMENTS == 4);
     DCHECK(FAST_HOLEY_DOUBLE_ELEMENTS == 5);
 
     // is the low bit set? If so, we are holey and that is good.
-    __ tst(r3, Operand(1));
-    __ b(ne, &normal_sequence);
+    __ andi(r0, r6, Operand(1));
+    __ bne(&normal_sequence, cr0);
   }
 
   // look at the first argument
-  __ ldr(r5, MemOperand(sp, 0));
-  __ cmp(r5, Operand::Zero());
-  __ b(eq, &normal_sequence);
+  __ LoadP(r8, MemOperand(sp, 0));
+  __ cmpi(r8, Operand::Zero());
+  __ beq(&normal_sequence);
 
   if (mode == DISABLE_ALLOCATION_SITES) {
     ElementsKind initial = GetInitialFastElementsKind();
     ElementsKind holey_initial = GetHoleyElementsKind(initial);
 
-    ArraySingleArgumentConstructorStub stub_holey(masm->isolate(),
-                                                  holey_initial,
-                                                  DISABLE_ALLOCATION_SITES);
+    ArraySingleArgumentConstructorStub stub_holey(
+        masm->isolate(), holey_initial, DISABLE_ALLOCATION_SITES);
     __ TailCallStub(&stub_holey);
 
     __ bind(&normal_sequence);
-    ArraySingleArgumentConstructorStub stub(masm->isolate(),
-                                            initial,
+    ArraySingleArgumentConstructorStub stub(masm->isolate(), initial,
                                             DISABLE_ALLOCATION_SITES);
     __ TailCallStub(&stub);
   } else if (mode == DONT_OVERRIDE) {
     // We are going to create a holey array, but our kind is non-holey.
     // Fix kind and retry (only if we have an allocation site in the slot).
-    __ add(r3, r3, Operand(1));
+    __ addi(r6, r6, Operand(1));
 
     if (FLAG_debug_code) {
-      __ ldr(r5, FieldMemOperand(r2, 0));
-      __ CompareRoot(r5, Heap::kAllocationSiteMapRootIndex);
+      __ LoadP(r8, FieldMemOperand(r5, 0));
+      __ CompareRoot(r8, Heap::kAllocationSiteMapRootIndex);
       __ Assert(eq, kExpectedAllocationSite);
     }
 
-    // Save the resulting elements kind in type info. We can't just store r3
+    // Save the resulting elements kind in type info. We can't just store r6
     // in the AllocationSite::transition_info field because elements kind is
     // restricted to a portion of the field...upper bits need to be left alone.
     STATIC_ASSERT(AllocationSite::ElementsKindBits::kShift == 0);
-    __ ldr(r4, FieldMemOperand(r2, AllocationSite::kTransitionInfoOffset));
-    __ add(r4, r4, Operand(Smi::FromInt(kFastElementsKindPackedToHoley)));
-    __ str(r4, FieldMemOperand(r2, AllocationSite::kTransitionInfoOffset));
+    __ LoadP(r7, FieldMemOperand(r5, AllocationSite::kTransitionInfoOffset));
+    __ AddSmiLiteral(r7, r7, Smi::FromInt(kFastElementsKindPackedToHoley), r0);
+    __ StoreP(r7, FieldMemOperand(r5, AllocationSite::kTransitionInfoOffset),
+              r0);
 
     __ bind(&normal_sequence);
-    int last_index = GetSequenceIndexFromFastElementsKind(
-        TERMINAL_FAST_ELEMENTS_KIND);
+    int last_index =
+        GetSequenceIndexFromFastElementsKind(TERMINAL_FAST_ELEMENTS_KIND);
     for (int i = 0; i <= last_index; ++i) {
       ElementsKind kind = GetFastElementsKindFromSequenceIndex(i);
-      __ cmp(r3, Operand(kind));
+      __ mov(r0, Operand(kind));
+      __ cmp(r6, r0);
       ArraySingleArgumentConstructorStub stub(masm->isolate(), kind);
       __ TailCallStub(&stub, eq);
     }
 
     // If we reached this point there is a problem.
     __ Abort(kUnexpectedElementsKindInArrayConstructor);
   } else {
     UNREACHABLE();
   }
 }
 
 
-template<class T>
+template <class T>
 static void ArrayConstructorStubAheadOfTimeHelper(Isolate* isolate) {
-  int to_index = GetSequenceIndexFromFastElementsKind(
-      TERMINAL_FAST_ELEMENTS_KIND);
+  int to_index =
+      GetSequenceIndexFromFastElementsKind(TERMINAL_FAST_ELEMENTS_KIND);
   for (int i = 0; i <= to_index; ++i) {
     ElementsKind kind = GetFastElementsKindFromSequenceIndex(i);
     T stub(isolate, kind);
     stub.GetCode();
     if (AllocationSite::GetMode(kind) != DONT_TRACK_ALLOCATION_SITE) {
       T stub1(isolate, kind, DISABLE_ALLOCATION_SITES);
       stub1.GetCode();
     }
   }
 }
 
 
 void ArrayConstructorStubBase::GenerateStubsAheadOfTime(Isolate* isolate) {
   ArrayConstructorStubAheadOfTimeHelper<ArrayNoArgumentConstructorStub>(
       isolate);
   ArrayConstructorStubAheadOfTimeHelper<ArraySingleArgumentConstructorStub>(
       isolate);
   ArrayConstructorStubAheadOfTimeHelper<ArrayNArgumentsConstructorStub>(
       isolate);
 }
 
 
 void InternalArrayConstructorStubBase::GenerateStubsAheadOfTime(
     Isolate* isolate) {
-  ElementsKind kinds[2] = { FAST_ELEMENTS, FAST_HOLEY_ELEMENTS };
+  ElementsKind kinds[2] = {FAST_ELEMENTS, FAST_HOLEY_ELEMENTS};
   for (int i = 0; i < 2; i++) {
     // For internal arrays we only need a few things
     InternalArrayNoArgumentConstructorStub stubh1(isolate, kinds[i]);
     stubh1.GetCode();
     InternalArraySingleArgumentConstructorStub stubh2(isolate, kinds[i]);
     stubh2.GetCode();
     InternalArrayNArgumentsConstructorStub stubh3(isolate, kinds[i]);
     stubh3.GetCode();
   }
 }
 
 
 void ArrayConstructorStub::GenerateDispatchToArrayStub(
-    MacroAssembler* masm,
-    AllocationSiteOverrideMode mode) {
+    MacroAssembler* masm, AllocationSiteOverrideMode mode) {
   if (argument_count() == ANY) {
     Label not_zero_case, not_one_case;
-    __ tst(r0, r0);
-    __ b(ne, &not_zero_case);
+    __ cmpi(r3, Operand::Zero());
+    __ bne(&not_zero_case);
     CreateArrayDispatch<ArrayNoArgumentConstructorStub>(masm, mode);
 
     __ bind(&not_zero_case);
-    __ cmp(r0, Operand(1));
-    __ b(gt, &not_one_case);
+    __ cmpi(r3, Operand(1));
+    __ bgt(&not_one_case);
     CreateArrayDispatchOneArgument(masm, mode);
 
     __ bind(&not_one_case);
     CreateArrayDispatch<ArrayNArgumentsConstructorStub>(masm, mode);
   } else if (argument_count() == NONE) {
     CreateArrayDispatch<ArrayNoArgumentConstructorStub>(masm, mode);
   } else if (argument_count() == ONE) {
     CreateArrayDispatchOneArgument(masm, mode);
   } else if (argument_count() == MORE_THAN_ONE) {
     CreateArrayDispatch<ArrayNArgumentsConstructorStub>(masm, mode);
   } else {
     UNREACHABLE();
   }
 }
 
 
 void ArrayConstructorStub::Generate(MacroAssembler* masm) {
   // ----------- S t a t e -------------
-  //  -- r0 : argc (only if argument_count() == ANY)
-  //  -- r1 : constructor
-  //  -- r2 : AllocationSite or undefined
+  //  -- r3 : argc (only if argument_count() == ANY)
+  //  -- r4 : constructor
+  //  -- r5 : AllocationSite or undefined
   //  -- sp[0] : return address
   //  -- sp[4] : last argument
   // -----------------------------------
 
   if (FLAG_debug_code) {
     // The array construct code is only set for the global and natives
     // builtin Array functions which always have maps.
 
     // Initial map for the builtin Array function should be a map.
-    __ ldr(r4, FieldMemOperand(r1, JSFunction::kPrototypeOrInitialMapOffset));
+    __ LoadP(r7, FieldMemOperand(r4, JSFunction::kPrototypeOrInitialMapOffset));
     // Will both indicate a NULL and a Smi.
-    __ tst(r4, Operand(kSmiTagMask));
-    __ Assert(ne, kUnexpectedInitialMapForArrayFunction);
-    __ CompareObjectType(r4, r4, r5, MAP_TYPE);
+    __ TestIfSmi(r7, r0);
+    __ Assert(ne, kUnexpectedInitialMapForArrayFunction, cr0);
+    __ CompareObjectType(r7, r7, r8, MAP_TYPE);
     __ Assert(eq, kUnexpectedInitialMapForArrayFunction);
 
-    // We should either have undefined in r2 or a valid AllocationSite
-    __ AssertUndefinedOrAllocationSite(r2, r4);
+    // We should either have undefined in r5 or a valid AllocationSite
+    __ AssertUndefinedOrAllocationSite(r5, r7);
   }
 
   Label no_info;
   // Get the elements kind and case on that.
-  __ CompareRoot(r2, Heap::kUndefinedValueRootIndex);
-  __ b(eq, &no_info);
+  __ CompareRoot(r5, Heap::kUndefinedValueRootIndex);
+  __ beq(&no_info);
 
-  __ ldr(r3, FieldMemOperand(r2, AllocationSite::kTransitionInfoOffset));
-  __ SmiUntag(r3);
+  __ LoadP(r6, FieldMemOperand(r5, AllocationSite::kTransitionInfoOffset));
+  __ SmiUntag(r6);
   STATIC_ASSERT(AllocationSite::ElementsKindBits::kShift == 0);
-  __ and_(r3, r3, Operand(AllocationSite::ElementsKindBits::kMask));
+  __ And(r6, r6, Operand(AllocationSite::ElementsKindBits::kMask));
   GenerateDispatchToArrayStub(masm, DONT_OVERRIDE);
 
   __ bind(&no_info);
   GenerateDispatchToArrayStub(masm, DISABLE_ALLOCATION_SITES);
 }
 
 
-void InternalArrayConstructorStub::GenerateCase(
-    MacroAssembler* masm, ElementsKind kind) {
-  __ cmp(r0, Operand(1));
+void InternalArrayConstructorStub::GenerateCase(MacroAssembler* masm,
+                                                ElementsKind kind) {
+  __ cmpli(r3, Operand(1));
 
   InternalArrayNoArgumentConstructorStub stub0(isolate(), kind);
-  __ TailCallStub(&stub0, lo);
+  __ TailCallStub(&stub0, lt);
 
   InternalArrayNArgumentsConstructorStub stubN(isolate(), kind);
-  __ TailCallStub(&stubN, hi);
+  __ TailCallStub(&stubN, gt);
 
   if (IsFastPackedElementsKind(kind)) {
     // We might need to create a holey array
     // look at the first argument
-    __ ldr(r3, MemOperand(sp, 0));
-    __ cmp(r3, Operand::Zero());
+    __ LoadP(r6, MemOperand(sp, 0));
+    __ cmpi(r6, Operand::Zero());
 
-    InternalArraySingleArgumentConstructorStub
-        stub1_holey(isolate(), GetHoleyElementsKind(kind));
+    InternalArraySingleArgumentConstructorStub stub1_holey(
+        isolate(), GetHoleyElementsKind(kind));
     __ TailCallStub(&stub1_holey, ne);
   }
 
   InternalArraySingleArgumentConstructorStub stub1(isolate(), kind);
   __ TailCallStub(&stub1);
 }
 
 
 void InternalArrayConstructorStub::Generate(MacroAssembler* masm) {
   // ----------- S t a t e -------------
-  //  -- r0 : argc
-  //  -- r1 : constructor
+  //  -- r3 : argc
+  //  -- r4 : constructor
   //  -- sp[0] : return address
   //  -- sp[4] : last argument
   // -----------------------------------
 
   if (FLAG_debug_code) {
     // The array construct code is only set for the global and natives
     // builtin Array functions which always have maps.
 
     // Initial map for the builtin Array function should be a map.
-    __ ldr(r3, FieldMemOperand(r1, JSFunction::kPrototypeOrInitialMapOffset));
+    __ LoadP(r6, FieldMemOperand(r4, JSFunction::kPrototypeOrInitialMapOffset));
     // Will both indicate a NULL and a Smi.
-    __ tst(r3, Operand(kSmiTagMask));
-    __ Assert(ne, kUnexpectedInitialMapForArrayFunction);
-    __ CompareObjectType(r3, r3, r4, MAP_TYPE);
+    __ TestIfSmi(r6, r0);
+    __ Assert(ne, kUnexpectedInitialMapForArrayFunction, cr0);
+    __ CompareObjectType(r6, r6, r7, MAP_TYPE);
     __ Assert(eq, kUnexpectedInitialMapForArrayFunction);
   }
 
   // Figure out the right elements kind
-  __ ldr(r3, FieldMemOperand(r1, JSFunction::kPrototypeOrInitialMapOffset));
-  // Load the map's "bit field 2" into |result|. We only need the first byte,
-  // but the following bit field extraction takes care of that anyway.
-  __ ldr(r3, FieldMemOperand(r3, Map::kBitField2Offset));
+  __ LoadP(r6, FieldMemOperand(r4, JSFunction::kPrototypeOrInitialMapOffset));
+  // Load the map's "bit field 2" into |result|.
+  __ lbz(r6, FieldMemOperand(r6, Map::kBitField2Offset));
   // Retrieve elements_kind from bit field 2.
-  __ DecodeField<Map::ElementsKindBits>(r3);
+  __ DecodeField<Map::ElementsKindBits>(r6);
 
   if (FLAG_debug_code) {
     Label done;
-    __ cmp(r3, Operand(FAST_ELEMENTS));
-    __ b(eq, &done);
-    __ cmp(r3, Operand(FAST_HOLEY_ELEMENTS));
-    __ Assert(eq,
-              kInvalidElementsKindForInternalArrayOrInternalPackedArray);
+    __ cmpi(r6, Operand(FAST_ELEMENTS));
+    __ beq(&done);
+    __ cmpi(r6, Operand(FAST_HOLEY_ELEMENTS));
+    __ Assert(eq, kInvalidElementsKindForInternalArrayOrInternalPackedArray);
     __ bind(&done);
   }
 
   Label fast_elements_case;
-  __ cmp(r3, Operand(FAST_ELEMENTS));
-  __ b(eq, &fast_elements_case);
+  __ cmpi(r6, Operand(FAST_ELEMENTS));
+  __ beq(&fast_elements_case);
   GenerateCase(masm, FAST_HOLEY_ELEMENTS);
 
   __ bind(&fast_elements_case);
   GenerateCase(masm, FAST_ELEMENTS);
 }
 
 
 void CallApiFunctionStub::Generate(MacroAssembler* masm) {
   // ----------- S t a t e -------------
-  //  -- r0                  : callee
-  //  -- r4                  : call_data
-  //  -- r2                  : holder
-  //  -- r1                  : api_function_address
+  //  -- r3                  : callee
+  //  -- r7                  : call_data
+  //  -- r5                  : holder
+  //  -- r4                  : api_function_address
   //  -- cp                  : context
   //  --
   //  -- sp[0]               : last argument
   //  -- ...
   //  -- sp[(argc - 1)* 4]   : first argument
   //  -- sp[argc * 4]        : receiver
   // -----------------------------------
 
-  Register callee = r0;
-  Register call_data = r4;
-  Register holder = r2;
-  Register api_function_address = r1;
+  Register callee = r3;
+  Register call_data = r7;
+  Register holder = r5;
+  Register api_function_address = r4;
   Register context = cp;
 
   int argc = this->argc();
   bool is_store = this->is_store();
   bool call_data_undefined = this->call_data_undefined();
 
   typedef FunctionCallbackArguments FCA;
 
   STATIC_ASSERT(FCA::kContextSaveIndex == 6);
   STATIC_ASSERT(FCA::kCalleeIndex == 5);
   STATIC_ASSERT(FCA::kDataIndex == 4);
   STATIC_ASSERT(FCA::kReturnValueOffset == 3);
   STATIC_ASSERT(FCA::kReturnValueDefaultValueIndex == 2);
   STATIC_ASSERT(FCA::kIsolateIndex == 1);
   STATIC_ASSERT(FCA::kHolderIndex == 0);
   STATIC_ASSERT(FCA::kArgsLength == 7);
 
   // context save
   __ push(context);
   // load context from callee
-  __ ldr(context, FieldMemOperand(callee, JSFunction::kContextOffset));
+  __ LoadP(context, FieldMemOperand(callee, JSFunction::kContextOffset));
 
   // callee
   __ push(callee);
 
   // call data
   __ push(call_data);
 
   Register scratch = call_data;
   if (!call_data_undefined) {
     __ LoadRoot(scratch, Heap::kUndefinedValueRootIndex);
   }
   // return value
   __ push(scratch);
   // return value default
   __ push(scratch);
   // isolate
-  __ mov(scratch,
-         Operand(ExternalReference::isolate_address(isolate())));
+  __ mov(scratch, Operand(ExternalReference::isolate_address(isolate())));
   __ push(scratch);
   // holder
   __ push(holder);
 
   // Prepare arguments.
-  __ mov(scratch, sp);
+  __ mr(scratch, sp);
 
   // Allocate the v8::Arguments structure in the arguments' space since
   // it's not controlled by GC.
-  const int kApiStackSpace = 4;
+  // PPC LINUX ABI:
+  //
+  // Create 5 extra slots on stack:
+  //    [0] space for DirectCEntryStub's LR save
+  //    [1-4] FunctionCallbackInfo
+  const int kApiStackSpace = 5;
 
   FrameScope frame_scope(masm, StackFrame::MANUAL);
   __ EnterExitFrame(false, kApiStackSpace);
 
-  DCHECK(!api_function_address.is(r0) && !scratch.is(r0));
-  // r0 = FunctionCallbackInfo&
+  DCHECK(!api_function_address.is(r3) && !scratch.is(r3));
+  // r3 = FunctionCallbackInfo&
   // Arguments is after the return address.
-  __ add(r0, sp, Operand(1 * kPointerSize));
+  __ addi(r3, sp, Operand((kStackFrameExtraParamSlot + 1) * kPointerSize));
   // FunctionCallbackInfo::implicit_args_
-  __ str(scratch, MemOperand(r0, 0 * kPointerSize));
+  __ StoreP(scratch, MemOperand(r3, 0 * kPointerSize));
   // FunctionCallbackInfo::values_
-  __ add(ip, scratch, Operand((FCA::kArgsLength - 1 + argc) * kPointerSize));
-  __ str(ip, MemOperand(r0, 1 * kPointerSize));
+  __ addi(ip, scratch, Operand((FCA::kArgsLength - 1 + argc) * kPointerSize));
+  __ StoreP(ip, MemOperand(r3, 1 * kPointerSize));
   // FunctionCallbackInfo::length_ = argc
-  __ mov(ip, Operand(argc));
-  __ str(ip, MemOperand(r0, 2 * kPointerSize));
+  __ li(ip, Operand(argc));
+  __ stw(ip, MemOperand(r3, 2 * kPointerSize));
   // FunctionCallbackInfo::is_construct_call = 0
-  __ mov(ip, Operand::Zero());
-  __ str(ip, MemOperand(r0, 3 * kPointerSize));
+  __ li(ip, Operand::Zero());
+  __ stw(ip, MemOperand(r3, 2 * kPointerSize + kIntSize));
 
   const int kStackUnwindSpace = argc + FCA::kArgsLength + 1;
   ExternalReference thunk_ref =
       ExternalReference::invoke_function_callback(isolate());
 
   AllowExternalCallThatCantCauseGC scope(masm);
   MemOperand context_restore_operand(
       fp, (2 + FCA::kContextSaveIndex) * kPointerSize);
   // Stores return the first js argument
   int return_value_offset = 0;
   if (is_store) {
     return_value_offset = 2 + FCA::kArgsLength;
   } else {
     return_value_offset = 2 + FCA::kReturnValueOffset;
   }
   MemOperand return_value_operand(fp, return_value_offset * kPointerSize);
 
-  __ CallApiFunctionAndReturn(api_function_address,
-                              thunk_ref,
-                              kStackUnwindSpace,
-                              return_value_operand,
+  __ CallApiFunctionAndReturn(api_function_address, thunk_ref,
+                              kStackUnwindSpace, return_value_operand,
                               &context_restore_operand);
 }
 
 
 void CallApiGetterStub::Generate(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- sp[0]                  : name
   //  -- sp[4 - kArgsLength*4]  : PropertyCallbackArguments object
   //  -- ...
-  //  -- r2                     : api_function_address
+  //  -- r5                     : api_function_address
   // -----------------------------------
 
   Register api_function_address = ApiGetterDescriptor::function_address();
-  DCHECK(api_function_address.is(r2));
+  DCHECK(api_function_address.is(r5));
 
-  __ mov(r0, sp);  // r0 = Handle<Name>
-  __ add(r1, r0, Operand(1 * kPointerSize));  // r1 = PCA
+  __ mr(r3, sp);                               // r0 = Handle<Name>
+  __ addi(r4, r3, Operand(1 * kPointerSize));  // r4 = PCA
 
-  const int kApiStackSpace = 1;
+// If ABI passes Handles (pointer-sized struct) in a register:
+//
+// Create 2 extra slots on stack:
+//    [0] space for DirectCEntryStub's LR save
+//    [1] AccessorInfo&
+//
+// Otherwise:
+//
+// Create 3 extra slots on stack:
+//    [0] space for DirectCEntryStub's LR save
+//    [1] copy of Handle (first arg)
+//    [2] AccessorInfo&
+#if ABI_PASSES_HANDLES_IN_REGS
+  const int kAccessorInfoSlot = kStackFrameExtraParamSlot + 1;
+  const int kApiStackSpace = 2;
+#else
+  const int kArg0Slot = kStackFrameExtraParamSlot + 1;
+  const int kAccessorInfoSlot = kArg0Slot + 1;
+  const int kApiStackSpace = 3;
+#endif
+
   FrameScope frame_scope(masm, StackFrame::MANUAL);
   __ EnterExitFrame(false, kApiStackSpace);
 
+#if !ABI_PASSES_HANDLES_IN_REGS
+  // pass 1st arg by reference
+  __ StoreP(r3, MemOperand(sp, kArg0Slot * kPointerSize));
+  __ addi(r3, sp, Operand(kArg0Slot * kPointerSize));
+#endif
+
   // Create PropertyAccessorInfo instance on the stack above the exit frame with
-  // r1 (internal::Object** args_) as the data.
-  __ str(r1, MemOperand(sp, 1 * kPointerSize));
-  __ add(r1, sp, Operand(1 * kPointerSize));  // r1 = AccessorInfo&
+  // r4 (internal::Object** args_) as the data.
+  __ StoreP(r4, MemOperand(sp, kAccessorInfoSlot * kPointerSize));
+  // r4 = AccessorInfo&
+  __ addi(r4, sp, Operand(kAccessorInfoSlot * kPointerSize));
 
   const int kStackUnwindSpace = PropertyCallbackArguments::kArgsLength + 1;
 
   ExternalReference thunk_ref =
       ExternalReference::invoke_accessor_getter_callback(isolate());
-  __ CallApiFunctionAndReturn(api_function_address,
-                              thunk_ref,
+  __ CallApiFunctionAndReturn(api_function_address, thunk_ref,
                               kStackUnwindSpace,
-                              MemOperand(fp, 6 * kPointerSize),
-                              NULL);
+                              MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
+}
+}  // namespace v8::internal
 
-} }  // namespace v8::internal
-
-#endif  // V8_TARGET_ARCH_ARM
+#endif  // V8_TARGET_ARCH_PPC