Implement caching scheme for Date fields.

src/arm/lithium-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1592 matching lines @@
 
 
 LInstruction* LChunkBuilder::DoDateField(HDateField* instr) {
   LOperand* object = UseRegister(instr->value());
   LDateField* result = new LDateField(object, TempRegister(), instr->index());
   return DefineAsRegister(result);
 }
 
 
 LInstruction* LChunkBuilder::DoSetDateField(HSetDateField* instr) {
-  LOperand* date = UseRegister(instr->OperandAt(1));
-  LOperand* value = UseRegister(instr->OperandAt(2));
+  LOperand* date = UseTempRegister(instr->OperandAt(1));
+  LOperand* value = UseTempRegister(instr->OperandAt(2));
   LSetDateField* result =
       new LSetDateField(date, value, TempRegister(), instr->index());
   return DefineAsRegister(result);
 }
 
 
 LInstruction* LChunkBuilder::DoBoundsCheck(HBoundsCheck* instr) {
   LOperand* value = UseRegisterAtStart(instr->index());
   LOperand* length = UseRegister(instr->length());
   return AssignEnvironment(new(zone()) LBoundsCheck(value, length));
@@ skipping 691 matching lines @@
 
 
 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
   LOperand* object = UseRegister(instr->object());
   LOperand* index = UseRegister(instr->index());
   return DefineAsRegister(new(zone()) LLoadFieldByIndex(object, index));
 }
 
 
 } }  // namespace v8::internal