[a64] Implement LStringCompareAndBranch

src/a64/lithium-a64.cc

 // Copyright 2013 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 279 matching lines @@
 
 void LStoreNamedGeneric::PrintDataTo(StringStream* stream) {
   object()->PrintTo(stream);
   stream->Add(".");
   stream->Add(*String::cast(*name())->ToCString());
   stream->Add(" <- ");
   value()->PrintTo(stream);
 }
 
 
+void LStringCompareAndBranch::PrintDataTo(StringStream* stream) {
+  stream->Add("if string_compare(");
+  left()->PrintTo(stream);
+  right()->PrintTo(stream);
+  stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
+}
+
+
 void LTransitionElementsKind::PrintDataTo(StringStream* stream) {
   object()->PrintTo(stream);
   stream->Add("%p -> %p", *original_map(), *transitioned_map());
 }
 
 
 template<int T>
 void LUnaryMathOperation<T>::PrintDataTo(StringStream* stream) {
   value()->PrintTo(stream);
 }
@@ skipping 1795 matching lines @@
 LInstruction* LChunkBuilder::DoStringCharFromCode(HStringCharFromCode* instr) {
   // TODO(all) use at start and remove assert in codegen
   LOperand* char_code = UseRegister(instr->value());
   LStringCharFromCode* result = new(zone()) LStringCharFromCode(char_code);
   return AssignPointerMap(DefineAsRegister(result));
 }
 
 
 LInstruction* LChunkBuilder::DoStringCompareAndBranch(
     HStringCompareAndBranch* instr) {
-  UNIMPLEMENTED_INSTRUCTION();
+  ASSERT(instr->left()->representation().IsTagged());
+  ASSERT(instr->right()->representation().IsTagged());
+  LOperand* left = UseFixed(instr->left(), x1);
+  LOperand* right = UseFixed(instr->right(), x0);
+  LStringCompareAndBranch* result =
+      new(zone()) LStringCompareAndBranch(left, right);
+  return MarkAsCall(result, instr);
 }
 
 
 LInstruction* LChunkBuilder::DoStringLength(HStringLength* instr) {
   // TODO(all): This instruction doesn't exist anymore on bleeding_edge.
   LOperand* string = UseRegisterAtStart(instr->value());
   return DefineAsRegister(new(zone()) LStringLength(string));
 }
 
 
@@ skipping 261 matching lines @@
 LInstruction* LChunkBuilder::DoWrapReceiver(HWrapReceiver* instr) {
   LOperand* receiver = UseRegister(instr->receiver());
   LOperand* function = UseRegisterAtStart(instr->function());
   LOperand* temp = TempRegister();
   LWrapReceiver* result = new(zone()) LWrapReceiver(receiver, function, temp);
   return AssignEnvironment(DefineAsRegister(result));
 }
 
 
 } }  // namespace v8::internal