Support fast case for-in in Crankshaft.

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index abf2f02bca6d1e6e900699aa5ba1f2dc1d4f22f9..cc177b891812fec73006e874f0c23067b25a67b4 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -2408,6 +2408,37 @@ LInstruction* LChunkBuilder::DoIn(HIn* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoForInPrepareMap(HForInPrepareMap* instr) {
+  LOperand* context = UseFixed(instr->context(), esi);
+  LOperand* object = UseFixed(instr->enumerable(), eax);
+  LForInPrepareMap* result = new(zone()) LForInPrepareMap(context, object);
+  return MarkAsCall(DefineFixed(result, eax), instr, CAN_DEOPTIMIZE_EAGERLY);
+}
+
+
+LInstruction* LChunkBuilder::DoForInCacheArray(HForInCacheArray* instr) {
+  LOperand* object = UseRegister(instr->enumerable());
+  LOperand* keys = UseRegister(instr->keys());
+  return AssignEnvironment(DefineAsRegister(
+      new(zone()) LForInCacheArray(object, keys)));
+}
+
+
+LInstruction* LChunkBuilder::DoCheckMapValue(HCheckMapValue* instr) {
+  LOperand* value = UseRegisterAtStart(instr->value());
+  LOperand* map = UseRegisterAtStart(instr->map());
+  return AssignEnvironment(DefineAsRegister(new(zone()) LCheckMapValue(value, map)));

[fschneider, 2012/02/20 14:56:06]

Long line.

[fschneider, 2012/02/20 14:56:06]

Since the result of the HCheckMapValue instruction is not used, you don't need
to assign an output register here.

+}
+
+
+LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
+  LOperand* object = UseRegister(instr->object());
+  LOperand* index = UseTempRegister(instr->index());
+  return DefineSameAsFirst(new(zone()) LLoadFieldByIndex(object, index));
+}
+
+
+
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32