[ic] Fixed receiver_map register trashing in KeyedStoreIC megamorphic.

src/ic/ppc/ic-ppc.cc

 // 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.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/codegen.h"
 #include "src/ic/ic.h"
 #include "src/ic/ic-compiler.h"
 #include "src/ic/stub-cache.h"
@@ skipping 479 matching lines @@
     MacroAssembler* masm, Label* fast_object, Label* fast_double, Label* slow,
     KeyedStoreCheckMap check_map, KeyedStoreIncrementLength increment_length,
     Register value, Register key, Register receiver, Register receiver_map,
     Register elements_map, Register elements) {
   Label transition_smi_elements;
   Label finish_object_store, non_double_value, transition_double_elements;
   Label fast_double_without_map_check;
 
   // Fast case: Do the store, could be either Object or double.
   __ bind(fast_object);
-  Register scratch_value = r7;
+  Register scratch = r7;
+  Register scratch2 = r0;
   Register address = r8;
+  DCHECK(!AreAliased(value, key, receiver, receiver_map, elements_map, elements,
+                     scratch, scratch2, address));
+
   if (check_map == kCheckMap) {
     __ LoadP(elements_map, FieldMemOperand(elements, HeapObject::kMapOffset));
-    __ mov(scratch_value,
-           Operand(masm->isolate()->factory()->fixed_array_map()));
-    __ cmp(elements_map, scratch_value);
+    __ mov(scratch, Operand(masm->isolate()->factory()->fixed_array_map()));
+    __ cmp(elements_map, scratch);
     __ bne(fast_double);
   }
 
   // HOLECHECK: guards "A[i] = V"
   // We have to go to the runtime if the current value is the hole because
   // there may be a callback on the element
   Label holecheck_passed1;
   __ addi(address, elements, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
-  __ SmiToPtrArrayOffset(scratch_value, key);
-  __ LoadPX(scratch_value, MemOperand(address, scratch_value));
-  __ Cmpi(scratch_value, Operand(masm->isolate()->factory()->the_hole_value()),
-          r0);
+  __ SmiToPtrArrayOffset(scratch, key);
+  __ LoadPX(scratch, MemOperand(address, scratch));
+  __ Cmpi(scratch, Operand(masm->isolate()->factory()->the_hole_value()),
+          scratch2);
   __ bne(&holecheck_passed1);
-  __ JumpIfDictionaryInPrototypeChain(receiver, elements_map, scratch_value,
-                                      slow);
+  __ JumpIfDictionaryInPrototypeChain(receiver, elements_map, scratch, slow);
 
   __ bind(&holecheck_passed1);
 
   // Smi stores don't require further checks.
   Label non_smi_value;
   __ JumpIfNotSmi(value, &non_smi_value);
 
   if (increment_length == kIncrementLength) {
     // Add 1 to receiver->length.
-    __ AddSmiLiteral(scratch_value, key, Smi::FromInt(1), r0);
-    __ StoreP(scratch_value, FieldMemOperand(receiver, JSArray::kLengthOffset),
-              r0);
+    __ AddSmiLiteral(scratch, key, Smi::FromInt(1), scratch2);
+    __ StoreP(scratch, FieldMemOperand(receiver, JSArray::kLengthOffset),
+              scratch2);
   }
   // It's irrelevant whether array is smi-only or not when writing a smi.
   __ addi(address, elements, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
-  __ SmiToPtrArrayOffset(scratch_value, key);
-  __ StorePX(value, MemOperand(address, scratch_value));
+  __ SmiToPtrArrayOffset(scratch, key);
+  __ StorePX(value, MemOperand(address, scratch));
   __ Ret();
 
   __ bind(&non_smi_value);
   // Escape to elements kind transition case.
-  __ CheckFastObjectElements(receiver_map, scratch_value,
-                             &transition_smi_elements);
+  __ CheckFastObjectElements(receiver_map, scratch, &transition_smi_elements);
 
   // Fast elements array, store the value to the elements backing store.
   __ bind(&finish_object_store);
   if (increment_length == kIncrementLength) {
     // Add 1 to receiver->length.
-    __ AddSmiLiteral(scratch_value, key, Smi::FromInt(1), r0);
-    __ StoreP(scratch_value, FieldMemOperand(receiver, JSArray::kLengthOffset),
-              r0);
+    __ AddSmiLiteral(scratch, key, Smi::FromInt(1), scratch2);
+    __ StoreP(scratch, FieldMemOperand(receiver, JSArray::kLengthOffset),
+              scratch2);
   }
   __ addi(address, elements, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
-  __ SmiToPtrArrayOffset(scratch_value, key);
-  __ StorePUX(value, MemOperand(address, scratch_value));
+  __ SmiToPtrArrayOffset(scratch, key);
+  __ StorePUX(value, MemOperand(address, scratch));
   // Update write barrier for the elements array address.
-  __ mr(scratch_value, value);  // Preserve the value which is returned.
-  __ RecordWrite(elements, address, scratch_value, kLRHasNotBeenSaved,
+  __ mr(scratch, value);  // Preserve the value which is returned.
+  __ RecordWrite(elements, address, scratch, kLRHasNotBeenSaved,
                  kDontSaveFPRegs, EMIT_REMEMBERED_SET, OMIT_SMI_CHECK);
   __ Ret();
 
   __ bind(fast_double);
   if (check_map == kCheckMap) {
     // Check for fast double array case. If this fails, call through to the
     // runtime.
     __ CompareRoot(elements_map, Heap::kFixedDoubleArrayMapRootIndex);
     __ bne(slow);
   }
 
   // HOLECHECK: guards "A[i] double hole?"
   // We have to see if the double version of the hole is present. If so
   // go to the runtime.
   __ addi(address, elements,
           Operand((FixedDoubleArray::kHeaderSize + Register::kExponentOffset -
                    kHeapObjectTag)));
-  __ SmiToDoubleArrayOffset(scratch_value, key);
-  __ lwzx(scratch_value, MemOperand(address, scratch_value));
-  __ Cmpi(scratch_value, Operand(kHoleNanUpper32), r0);
+  __ SmiToDoubleArrayOffset(scratch, key);
+  __ lwzx(scratch, MemOperand(address, scratch));
+  __ Cmpi(scratch, Operand(kHoleNanUpper32), scratch2);
   __ bne(&fast_double_without_map_check);
-  __ JumpIfDictionaryInPrototypeChain(receiver, elements_map, scratch_value,
-                                      slow);
+  __ JumpIfDictionaryInPrototypeChain(receiver, elements_map, scratch, slow);
 
   __ bind(&fast_double_without_map_check);
-  __ StoreNumberToDoubleElements(value, key, elements, r6, d0,
+  __ StoreNumberToDoubleElements(value, key, elements, scratch, d0,
                                  &transition_double_elements);
   if (increment_length == kIncrementLength) {
     // Add 1 to receiver->length.
-    __ AddSmiLiteral(scratch_value, key, Smi::FromInt(1), r0);
-    __ StoreP(scratch_value, FieldMemOperand(receiver, JSArray::kLengthOffset),
-              r0);
+    __ AddSmiLiteral(scratch, key, Smi::FromInt(1), scratch2);
+    __ StoreP(scratch, FieldMemOperand(receiver, JSArray::kLengthOffset),
+              scratch2);
   }
   __ Ret();
 
   __ bind(&transition_smi_elements);
   // Transition the array appropriately depending on the value type.
   __ LoadP(r7, FieldMemOperand(value, HeapObject::kMapOffset));
   __ CompareRoot(r7, Heap::kHeapNumberMapRootIndex);
   __ bne(&non_double_value);
 
   // Value is a double. Transition FAST_SMI_ELEMENTS ->
   // FAST_DOUBLE_ELEMENTS and complete the store.
   __ LoadTransitionedArrayMapConditional(
-      FAST_SMI_ELEMENTS, FAST_DOUBLE_ELEMENTS, receiver_map, r7, slow);
+      FAST_SMI_ELEMENTS, FAST_DOUBLE_ELEMENTS, receiver_map, scratch, slow);
   AllocationSiteMode mode =
       AllocationSite::GetMode(FAST_SMI_ELEMENTS, FAST_DOUBLE_ELEMENTS);
   ElementsTransitionGenerator::GenerateSmiToDouble(masm, receiver, key, value,
                                                    receiver_map, mode, slow);
   __ LoadP(elements, FieldMemOperand(receiver, JSObject::kElementsOffset));
   __ b(&fast_double_without_map_check);
 
   __ bind(&non_double_value);
   // Value is not a double, FAST_SMI_ELEMENTS -> FAST_ELEMENTS
   __ LoadTransitionedArrayMapConditional(FAST_SMI_ELEMENTS, FAST_ELEMENTS,
-                                         receiver_map, r7, slow);
+                                         receiver_map, scratch, slow);
   mode = AllocationSite::GetMode(FAST_SMI_ELEMENTS, FAST_ELEMENTS);
   ElementsTransitionGenerator::GenerateMapChangeElementsTransition(
       masm, receiver, key, value, receiver_map, mode, slow);
   __ LoadP(elements, FieldMemOperand(receiver, JSObject::kElementsOffset));
   __ b(&finish_object_store);
 
   __ bind(&transition_double_elements);
   // Elements are FAST_DOUBLE_ELEMENTS, but value is an Object that's not a
   // HeapNumber. Make sure that the receiver is a Array with FAST_ELEMENTS and
   // transition array from FAST_DOUBLE_ELEMENTS to FAST_ELEMENTS
   __ LoadTransitionedArrayMapConditional(FAST_DOUBLE_ELEMENTS, FAST_ELEMENTS,
-                                         receiver_map, r7, slow);
+                                         receiver_map, scratch, slow);
   mode = AllocationSite::GetMode(FAST_DOUBLE_ELEMENTS, FAST_ELEMENTS);
   ElementsTransitionGenerator::GenerateDoubleToObject(
       masm, receiver, key, value, receiver_map, mode, slow);
   __ LoadP(elements, FieldMemOperand(receiver, JSObject::kElementsOffset));
   __ b(&finish_object_store);
 }
 
 
 void KeyedStoreIC::GenerateMegamorphic(MacroAssembler* masm,
                                        LanguageMode language_mode) {
@@ skipping 273 matching lines @@
     patcher.EmitCondition(ne);
   } else {
     DCHECK(Assembler::GetCondition(branch_instr) == ne);
     patcher.EmitCondition(eq);
   }
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC