Optimize HWrapReceiver

src/x64/lithium-codegen-x64.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 3143 matching lines @@
 void LCodeGen::DoWrapReceiver(LWrapReceiver* instr) {
   Register receiver = ToRegister(instr->receiver());
   Register function = ToRegister(instr->function());
 
   // If the receiver is null or undefined, we have to pass the global
   // object as a receiver to normal functions. Values have to be
   // passed unchanged to builtins and strict-mode functions.
   Label global_object, receiver_ok;
   Label::Distance dist = DeoptEveryNTimes() ? Label::kFar : Label::kNear;
 
-  // Do not transform the receiver to object for strict mode
-  // functions.
-  __ movp(kScratchRegister,
-          FieldOperand(function, JSFunction::kSharedFunctionInfoOffset));
-  __ testb(FieldOperand(kScratchRegister,
-                        SharedFunctionInfo::kStrictModeByteOffset),
-           Immediate(1 << SharedFunctionInfo::kStrictModeBitWithinByte));
-  __ j(not_equal, &receiver_ok, dist);
+  if (!instr->hydrogen()->known_function()) {
+    // Do not transform the receiver to object for strict mode
+    // functions.
+    __ movp(kScratchRegister,
+            FieldOperand(function, JSFunction::kSharedFunctionInfoOffset));
+    __ testb(FieldOperand(kScratchRegister,
+                          SharedFunctionInfo::kStrictModeByteOffset),
+             Immediate(1 << SharedFunctionInfo::kStrictModeBitWithinByte));
+    __ j(not_equal, &receiver_ok, dist);
 
-  // Do not transform the receiver to object for builtins.
-  __ testb(FieldOperand(kScratchRegister,
-                        SharedFunctionInfo::kNativeByteOffset),
-           Immediate(1 << SharedFunctionInfo::kNativeBitWithinByte));
-  __ j(not_equal, &receiver_ok, dist);
+    // Do not transform the receiver to object for builtins.
+    __ testb(FieldOperand(kScratchRegister,
+                          SharedFunctionInfo::kNativeByteOffset),
+             Immediate(1 << SharedFunctionInfo::kNativeBitWithinByte));
+    __ j(not_equal, &receiver_ok, dist);
+  }
 
   // Normal function. Replace undefined or null with global receiver.
   __ CompareRoot(receiver, Heap::kNullValueRootIndex);
   __ j(equal, &global_object, Label::kNear);
   __ CompareRoot(receiver, Heap::kUndefinedValueRootIndex);
   __ j(equal, &global_object, Label::kNear);
 
   // The receiver should be a JS object.
   Condition is_smi = __ CheckSmi(receiver);
   DeoptimizeIf(is_smi, instr->environment());
   __ CmpObjectType(receiver, FIRST_SPEC_OBJECT_TYPE, kScratchRegister);
   DeoptimizeIf(below, instr->environment());
+
   __ jmp(&receiver_ok, Label::kNear);
-
   __ bind(&global_object);
   __ movp(receiver, FieldOperand(function, JSFunction::kContextOffset));
   __ movp(receiver,
-          Operand(receiver, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
+          Operand(receiver,
+                  Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
   __ movp(receiver,
           FieldOperand(receiver, GlobalObject::kGlobalReceiverOffset));
+
   __ bind(&receiver_ok);
 }
 
 
 void LCodeGen::DoApplyArguments(LApplyArguments* instr) {
   Register receiver = ToRegister(instr->receiver());
   Register function = ToRegister(instr->function());
   Register length = ToRegister(instr->length());
   Register elements = ToRegister(instr->elements());
   ASSERT(receiver.is(rax));  // Used for parameter count.
@@ skipping 2338 matching lines @@
                                FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64