PowerPC specific sub-directories

src/ic/ppc/stub-cache-ppc.cc

-// Copyright 2012 the V8 project authors. All rights reserved.
+// Copyright 2014 the V8 project authors. All rights reserved.
 // 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/codegen.h"
 #include "src/ic/stub-cache.h"
 
 namespace v8 {
 namespace internal {
 
 #define __ ACCESS_MASM(masm)
 
 
 static void ProbeTable(Isolate* isolate, MacroAssembler* masm,
                        Code::Flags flags, bool leave_frame,
                        StubCache::Table table, Register receiver, Register name,
                        // Number of the cache entry, not scaled.
                        Register offset, Register scratch, Register scratch2,
                        Register offset_scratch) {
   ExternalReference key_offset(isolate->stub_cache()->key_reference(table));
   ExternalReference value_offset(isolate->stub_cache()->value_reference(table));
   ExternalReference map_offset(isolate->stub_cache()->map_reference(table));
 
-  uint32_t key_off_addr = reinterpret_cast<uint32_t>(key_offset.address());
-  uint32_t value_off_addr = reinterpret_cast<uint32_t>(value_offset.address());
-  uint32_t map_off_addr = reinterpret_cast<uint32_t>(map_offset.address());
+  uintptr_t key_off_addr = reinterpret_cast<uintptr_t>(key_offset.address());
+  uintptr_t value_off_addr =
+      reinterpret_cast<uintptr_t>(value_offset.address());
+  uintptr_t map_off_addr = reinterpret_cast<uintptr_t>(map_offset.address());
 
   // Check the relative positions of the address fields.
   DCHECK(value_off_addr > key_off_addr);
   DCHECK((value_off_addr - key_off_addr) % 4 == 0);
   DCHECK((value_off_addr - key_off_addr) < (256 * 4));
   DCHECK(map_off_addr > key_off_addr);
   DCHECK((map_off_addr - key_off_addr) % 4 == 0);
   DCHECK((map_off_addr - key_off_addr) < (256 * 4));
 
   Label miss;
   Register base_addr = scratch;
   scratch = no_reg;
 
   // Multiply by 3 because there are 3 fields per entry (name, code, map).
-  __ add(offset_scratch, offset, Operand(offset, LSL, 1));
+  __ ShiftLeftImm(offset_scratch, offset, Operand(1));
+  __ add(offset_scratch, offset, offset_scratch);
 
   // Calculate the base address of the entry.
   __ mov(base_addr, Operand(key_offset));
-  __ add(base_addr, base_addr, Operand(offset_scratch, LSL, kPointerSizeLog2));
+  __ ShiftLeftImm(scratch2, offset_scratch, Operand(kPointerSizeLog2));
+  __ add(base_addr, base_addr, scratch2);
 
   // Check that the key in the entry matches the name.
-  __ ldr(ip, MemOperand(base_addr, 0));
+  __ LoadP(ip, MemOperand(base_addr, 0));
   __ cmp(name, ip);
-  __ b(ne, &miss);
+  __ bne(&miss);
 
   // Check the map matches.
-  __ ldr(ip, MemOperand(base_addr, map_off_addr - key_off_addr));
-  __ ldr(scratch2, FieldMemOperand(receiver, HeapObject::kMapOffset));
+  __ LoadP(ip, MemOperand(base_addr, map_off_addr - key_off_addr));
+  __ LoadP(scratch2, FieldMemOperand(receiver, HeapObject::kMapOffset));
   __ cmp(ip, scratch2);
-  __ b(ne, &miss);
+  __ bne(&miss);
 
   // Get the code entry from the cache.
   Register code = scratch2;
   scratch2 = no_reg;
-  __ ldr(code, MemOperand(base_addr, value_off_addr - key_off_addr));
+  __ LoadP(code, MemOperand(base_addr, value_off_addr - key_off_addr));
 
   // Check that the flags match what we're looking for.
   Register flags_reg = base_addr;
   base_addr = no_reg;
-  __ ldr(flags_reg, FieldMemOperand(code, Code::kFlagsOffset));
-  // It's a nice optimization if this constant is encodable in the bic insn.
+  __ lwz(flags_reg, FieldMemOperand(code, Code::kFlagsOffset));
 
-  uint32_t mask = Code::kFlagsNotUsedInLookup;
-  DCHECK(__ ImmediateFitsAddrMode1Instruction(mask));
-  __ bic(flags_reg, flags_reg, Operand(mask));
-  __ cmp(flags_reg, Operand(flags));
-  __ b(ne, &miss);
+  DCHECK(!r0.is(flags_reg));
+  __ li(r0, Operand(Code::kFlagsNotUsedInLookup));
+  __ andc(flags_reg, flags_reg, r0);
+  __ mov(r0, Operand(flags));
+  __ cmpl(flags_reg, r0);
+  __ bne(&miss);
 
 #ifdef DEBUG
   if (FLAG_test_secondary_stub_cache && table == StubCache::kPrimary) {
-    __ jmp(&miss);
+    __ b(&miss);
   } else if (FLAG_test_primary_stub_cache && table == StubCache::kSecondary) {
-    __ jmp(&miss);
+    __ b(&miss);
   }
 #endif
 
   if (leave_frame) __ LeaveFrame(StackFrame::INTERNAL);
 
   // Jump to the first instruction in the code stub.
-  __ add(pc, code, Operand(Code::kHeaderSize - kHeapObjectTag));
+  __ addi(r0, code, Operand(Code::kHeaderSize - kHeapObjectTag));
+  __ mtctr(r0);
+  __ bctr();
 
   // Miss: fall through.
   __ bind(&miss);
 }
 
 
 void StubCache::GenerateProbe(MacroAssembler* masm, Code::Flags flags,
                               bool leave_frame, Register receiver,
                               Register name, Register scratch, Register extra,
                               Register extra2, Register extra3) {
   Isolate* isolate = masm->isolate();
   Label miss;
 
+#if V8_TARGET_ARCH_PPC64
+  // Make sure that code is valid. The multiplying code relies on the
+  // entry size being 24.
+  DCHECK(sizeof(Entry) == 24);
+#else
   // Make sure that code is valid. The multiplying code relies on the
   // entry size being 12.
   DCHECK(sizeof(Entry) == 12);
+#endif
 
   // Make sure the flags does not name a specific type.
   DCHECK(Code::ExtractTypeFromFlags(flags) == 0);
 
   // Make sure that there are no register conflicts.
   DCHECK(!scratch.is(receiver));
   DCHECK(!scratch.is(name));
   DCHECK(!extra.is(receiver));
   DCHECK(!extra.is(name));
   DCHECK(!extra.is(scratch));
   DCHECK(!extra2.is(receiver));
   DCHECK(!extra2.is(name));
   DCHECK(!extra2.is(scratch));
   DCHECK(!extra2.is(extra));
 
   // Check scratch, extra and extra2 registers are valid.
   DCHECK(!scratch.is(no_reg));
   DCHECK(!extra.is(no_reg));
   DCHECK(!extra2.is(no_reg));
   DCHECK(!extra3.is(no_reg));
 
   Counters* counters = masm->isolate()->counters();
   __ IncrementCounter(counters->megamorphic_stub_cache_probes(), 1, extra2,
                       extra3);
 
   // Check that the receiver isn't a smi.
   __ JumpIfSmi(receiver, &miss);
 
   // Get the map of the receiver and compute the hash.
-  __ ldr(scratch, FieldMemOperand(name, Name::kHashFieldOffset));
-  __ ldr(ip, FieldMemOperand(receiver, HeapObject::kMapOffset));
-  __ add(scratch, scratch, Operand(ip));
+  __ lwz(scratch, FieldMemOperand(name, Name::kHashFieldOffset));
+  __ LoadP(ip, FieldMemOperand(receiver, HeapObject::kMapOffset));
+  __ add(scratch, scratch, ip);
+#if V8_TARGET_ARCH_PPC64
+  // Use only the low 32 bits of the map pointer.
+  __ rldicl(scratch, scratch, 0, 32);
+#endif
   uint32_t mask = kPrimaryTableSize - 1;
   // We shift out the last two bits because they are not part of the hash and
   // they are always 01 for maps.
-  __ mov(scratch, Operand(scratch, LSR, kCacheIndexShift));
+  __ ShiftRightImm(scratch, scratch, Operand(kCacheIndexShift));
   // Mask down the eor argument to the minimum to keep the immediate
-  // ARM-encodable.
-  __ eor(scratch, scratch, Operand((flags >> kCacheIndexShift) & mask));
+  // encodable.
+  __ xori(scratch, scratch, Operand((flags >> kCacheIndexShift) & mask));
   // Prefer and_ to ubfx here because ubfx takes 2 cycles.
-  __ and_(scratch, scratch, Operand(mask));
+  __ andi(scratch, scratch, Operand(mask));
 
   // Probe the primary table.
   ProbeTable(isolate, masm, flags, leave_frame, kPrimary, receiver, name,
              scratch, extra, extra2, extra3);
 
   // Primary miss: Compute hash for secondary probe.
-  __ sub(scratch, scratch, Operand(name, LSR, kCacheIndexShift));
+  __ ShiftRightImm(extra, name, Operand(kCacheIndexShift));
+  __ sub(scratch, scratch, extra);
   uint32_t mask2 = kSecondaryTableSize - 1;
-  __ add(scratch, scratch, Operand((flags >> kCacheIndexShift) & mask2));
-  __ and_(scratch, scratch, Operand(mask2));
+  __ addi(scratch, scratch, Operand((flags >> kCacheIndexShift) & mask2));
+  __ andi(scratch, scratch, Operand(mask2));
 
   // Probe the secondary table.
   ProbeTable(isolate, masm, flags, leave_frame, kSecondary, receiver, name,
              scratch, extra, extra2, extra3);
 
   // Cache miss: Fall-through and let caller handle the miss by
   // entering the runtime system.
   __ bind(&miss);
   __ IncrementCounter(counters->megamorphic_stub_cache_misses(), 1, extra2,
                       extra3);
 }
 
 
 #undef __
 }
 }  // namespace v8::internal
 
-#endif  // V8_TARGET_ARCH_ARM
+#endif  // V8_TARGET_ARCH_PPC