Port r17635 (14180b1)
Original commit message:
The new stub is enabled via the --new-string-add flag, which is
disabled by default. For now, it's only a stripped down version
of the native StringAddStub, it's still work-in-progress.
BUG=v8:2990
R=plind44@gmail.com
Review URL: https://codereview.chromium.org/
69953005
Patch from Balazs Kilvady <kilvadyb@homejinni.com>.
git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17664
ce2b1a6d-e550-0410-aec6-
3dcde31c8c00
}
+void NewStringAddStub::InitializeInterfaceDescriptor(
+ Isolate* isolate,
+ CodeStubInterfaceDescriptor* descriptor) {
+ static Register registers[] = { a1, a0 };
+ descriptor->register_param_count_ = 2;
+ descriptor->register_params_ = registers;
+ descriptor->deoptimization_handler_ =
+ Runtime::FunctionForId(Runtime::kStringAdd)->entry;
+}
+
+
#define __ ACCESS_MASM(masm)
void FullCodeGenerator::EmitStringAdd(CallRuntime* expr) {
ZoneList<Expression*>* args = expr->arguments();
ASSERT_EQ(2, args->length());
- VisitForStackValue(args->at(0));
- VisitForStackValue(args->at(1));
+ if (FLAG_new_string_add) {
+ VisitForStackValue(args->at(0));
+ VisitForAccumulatorValue(args->at(1));
- StringAddStub stub(STRING_ADD_CHECK_BOTH);
- __ CallStub(&stub);
+ __ pop(a1);
+ NewStringAddStub stub(STRING_ADD_CHECK_BOTH, NOT_TENURED);
+ __ CallStub(&stub);
+ } else {
+ VisitForStackValue(args->at(0));
+ VisitForStackValue(args->at(1));
+
+ StringAddStub stub(STRING_ADD_CHECK_BOTH);
+ __ CallStub(&stub);
+ }
context()->Plug(v0);
}
void LCodeGen::DoStringAdd(LStringAdd* instr) {
ASSERT(ToRegister(instr->context()).is(cp));
- __ push(ToRegister(instr->left()));
- __ push(ToRegister(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(a1));
+ ASSERT(ToRegister(instr->right()).is(a0));
+ NewStringAddStub stub(instr->hydrogen()->flags(),
+ isolate()->heap()->GetPretenureMode());
+ CallCode(stub.GetCode(isolate()), RelocInfo::CODE_TARGET, instr);
+ } else {
+ __ push(ToRegister(instr->left()));
+ __ push(ToRegister(instr->right()));
+ StringAddStub stub(instr->hydrogen()->flags());
+ CallCode(stub.GetCode(isolate()), RelocInfo::CODE_TARGET, instr);
+ }
}
LInstruction* LChunkBuilder::DoStringAdd(HStringAdd* instr) {
LOperand* context = UseFixed(instr->context(), cp);
- LOperand* left = UseRegisterAtStart(instr->left());
- LOperand* right = UseRegisterAtStart(instr->right());
+ LOperand* left = FLAG_new_string_add
+ ? UseFixed(instr->left(), a1)
+ : UseRegisterAtStart(instr->left());
+ LOperand* right = FLAG_new_string_add
+ ? UseFixed(instr->right(), a0)
+ : UseRegisterAtStart(instr->right());
return MarkAsCall(
DefineFixed(new(zone()) LStringAdd(context, left, right), v0),
instr);