Port IsConstructCall optimization to x64 and ARM.

src/x64/codegen-x64.cc

 // Copyright 2009 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 3217 matching lines @@
   destination()->false_target()->Branch(equal);
   // It is a heap object - get map.
   // Check if the object is a JS array or not.
   __ CmpObjectType(value.reg(), JS_ARRAY_TYPE, kScratchRegister);
   value.Unuse();
   destination()->Split(equal);
 }
 
 
 void CodeGenerator::GenerateIsConstructCall(ZoneList<Expression*>* args) {
-  // TODO(X64): Optimize this like it's done on IA-32.
   ASSERT(args->length() == 0);
-  Result answer = frame_->CallRuntime(Runtime::kIsConstructCall, 0);
-  frame_->Push(&answer);
+
+  // Get the frame pointer for the calling frame.
+  Result fp = allocator()->Allocate();
+  __ movq(fp.reg(), Operand(rbp, StandardFrameConstants::kCallerFPOffset));
+
+  // Skip the arguments adaptor frame if it exists.
+  Label check_frame_marker;
+  __ cmpq(Operand(fp.reg(), StandardFrameConstants::kContextOffset),
+          Immediate(ArgumentsAdaptorFrame::SENTINEL));
+  __ j(not_equal, &check_frame_marker);
+  __ movq(fp.reg(), Operand(fp.reg(), StandardFrameConstants::kCallerFPOffset));
+
+  // Check the marker in the calling frame.
+  __ bind(&check_frame_marker);
+  __ cmpq(Operand(fp.reg(), StandardFrameConstants::kMarkerOffset),
+          Immediate(Smi::FromInt(StackFrame::CONSTRUCT)));
+  fp.Unuse();
+  destination()->Split(equal);
 }
 
 
 void CodeGenerator::GenerateArgumentsLength(ZoneList<Expression*>* args) {
   ASSERT(args->length() == 0);
   // ArgumentsAccessStub takes the parameter count as an input argument
   // in register eax.  Create a constant result for it.
   Result count(Handle<Smi>(Smi::FromInt(scope_->num_parameters())));
   // Call the shared stub to get to the arguments.length.
   ArgumentsAccessStub stub(ArgumentsAccessStub::READ_LENGTH);
@@ skipping 3680 matching lines @@
 int CompareStub::MinorKey() {
   // Encode the two parameters in a unique 16 bit value.
   ASSERT(static_cast<unsigned>(cc_) < (1 << 15));
   return (static_cast<unsigned>(cc_) << 1) | (strict_ ? 1 : 0);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal