[hydrogen] optimize switch with string clauses

src/ia32/lithium-ia32.cc

 // Copyright 2011 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 207 matching lines @@
 }
 
 
 void LIsObjectAndBranch::PrintDataTo(StringStream* stream) {
   stream->Add("if is_object(");
   InputAt(0)->PrintTo(stream);
   stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
 }
 
 
+void LIsStringAndBranch::PrintDataTo(StringStream* stream) {
+  stream->Add("if is_string(");
+  InputAt(0)->PrintTo(stream);
+  stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
+}
+
+
 void LIsSmiAndBranch::PrintDataTo(StringStream* stream) {
   stream->Add("if is_smi(");
   InputAt(0)->PrintTo(stream);
   stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
 }
 
 
 void LIsUndetectableAndBranch::PrintDataTo(StringStream* stream) {
   stream->Add("if is_undetectable(");
   InputAt(0)->PrintTo(stream);
   stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
 }
 
 
+void LStringCompareAndBranch::PrintDataTo(StringStream* stream) {
+  stream->Add("if compare_generic(");
+  InputAt(1)->PrintTo(stream);
+  InputAt(2)->PrintTo(stream);
+  stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
+}
+
+
 void LHasInstanceTypeAndBranch::PrintDataTo(StringStream* stream) {
   stream->Add("if has_instance_type(");
   InputAt(0)->PrintTo(stream);
   stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
 }
 
 
 void LHasCachedArrayIndexAndBranch::PrintDataTo(StringStream* stream) {
   stream->Add("if has_cached_array_index(");
   InputAt(0)->PrintTo(stream);
@@ skipping 1240 matching lines @@
 }
 
 
 LInstruction* LChunkBuilder::DoIsObjectAndBranch(HIsObjectAndBranch* instr) {
   ASSERT(instr->value()->representation().IsTagged());
   LOperand* temp = TempRegister();
   return new(zone()) LIsObjectAndBranch(UseRegister(instr->value()), temp);
 }
 
 
+LInstruction* LChunkBuilder::DoIsStringAndBranch(HIsStringAndBranch* instr) {
+  ASSERT(instr->value()->representation().IsTagged());
+  LOperand* temp = TempRegister();
+  return new LIsStringAndBranch(UseRegister(instr->value()), temp);
+}
+
+
 LInstruction* LChunkBuilder::DoIsSmiAndBranch(HIsSmiAndBranch* instr) {
   ASSERT(instr->value()->representation().IsTagged());
   return new(zone()) LIsSmiAndBranch(Use(instr->value()));
 }
 
 
 LInstruction* LChunkBuilder::DoIsUndetectableAndBranch(
     HIsUndetectableAndBranch* instr) {
   ASSERT(instr  ->value()->representation().IsTagged());
   return new(zone()) LIsUndetectableAndBranch(
       UseRegisterAtStart(instr->value()), TempRegister());
 }
 
 
+LInstruction* LChunkBuilder::DoStringCompareAndBranch(
+    HStringCompareAndBranch* instr) {
+  ASSERT(instr->left()->representation().IsTagged());
+  ASSERT(instr->right()->representation().IsTagged());
+  LOperand* context = UseFixed(instr->context(), esi);
+  LOperand* left = UseFixed(instr->left(), edx);
+  LOperand* right = UseFixed(instr->right(), eax);
+
+  LStringCompareAndBranch* result = new
+      LStringCompareAndBranch(context, left, right);
+
+  return MarkAsCall(result, instr);
+}
+
+
 LInstruction* LChunkBuilder::DoHasInstanceTypeAndBranch(
     HHasInstanceTypeAndBranch* instr) {
   ASSERT(instr->value()->representation().IsTagged());
   return new(zone()) LHasInstanceTypeAndBranch(
       UseRegisterAtStart(instr->value()),
       TempRegister());
 }
 
 
 LInstruction* LChunkBuilder::DoGetCachedArrayIndex(
@@ skipping 794 matching lines @@
   LOperand* key = UseOrConstantAtStart(instr->key());
   LOperand* object = UseOrConstantAtStart(instr->object());
   LIn* result = new(zone()) LIn(context, key, object);
   return MarkAsCall(DefineFixed(result, eax), instr);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32