Add initial hydrogenized NewStringAddStub.

src/ia32/lithium-codegen-ia32.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 4533 matching lines @@
     write_register = ToRegister(instr->temp());
     __ mov(write_register, FieldOperand(object, JSObject::kPropertiesOffset));
   }
 
   MemOperand operand = FieldOperand(write_register, offset);
   if (instr->value()->IsConstantOperand()) {
     LConstantOperand* operand_value = LConstantOperand::cast(instr->value());
     if (operand_value->IsRegister()) {
       Register value = ToRegister(operand_value);
       __ Store(value, operand, representation);
+    } else if (representation.IsInteger32()) {
+      Immediate immediate = ToImmediate(operand_value, representation);
+      ASSERT(!instr->hydrogen()->NeedsWriteBarrier());
+      __ mov(operand, immediate);
     } else {
       Handle<Object> handle_value = ToHandle(operand_value);
       ASSERT(!instr->hydrogen()->NeedsWriteBarrier());
       __ mov(operand, handle_value);
     }
   } else {
     Register value = ToRegister(instr->value());
     __ Store(value, operand, representation);
   }
 
@@ skipping 426 matching lines @@
   PushSafepointRegistersScope scope(this);
   __ SmiTag(char_code);
   __ push(char_code);
   CallRuntimeFromDeferred(Runtime::kCharFromCode, 1, instr, instr->context());
   __ StoreToSafepointRegisterSlot(result, eax);
 }
 
 
 void LCodeGen::DoStringAdd(LStringAdd* instr) {
   ASSERT(ToRegister(instr->context()).is(esi));
-  EmitPushTaggedOperand(instr->left());
-  EmitPushTaggedOperand(instr->right());
-  StringAddStub stub(instr->hydrogen()->flags());
-  CallCode(stub.GetCode(isolate()), RelocInfo::CODE_TARGET, instr);
+  if (FLAG_new_string_add) {
+    ASSERT(ToRegister(instr->left()).is(edx));
+    ASSERT(ToRegister(instr->right()).is(eax));
+    NewStringAddStub stub(instr->hydrogen()->flags(),
+                          isolate()->heap()->GetPretenureMode());
+    CallCode(stub.GetCode(isolate()), RelocInfo::CODE_TARGET, instr);
+  } else {
+    EmitPushTaggedOperand(instr->left());
+    EmitPushTaggedOperand(instr->right());
+    StringAddStub stub(instr->hydrogen()->flags());
+    CallCode(stub.GetCode(isolate()), RelocInfo::CODE_TARGET, instr);
+  }
 }
 
 
 void LCodeGen::DoInteger32ToDouble(LInteger32ToDouble* instr) {
   LOperand* input = instr->value();
   LOperand* output = instr->result();
   ASSERT(input->IsRegister() || input->IsStackSlot());
   ASSERT(output->IsDoubleRegister());
   if (CpuFeatures::IsSupported(SSE2)) {
     CpuFeatureScope scope(masm(), SSE2);
@@ skipping 1422 matching lines @@
                               FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32