Turn ToNumberStub into a hydrogen code stub.

src/x64/code-stubs-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 21 matching lines @@
 #include "bootstrapper.h"
 #include "code-stubs.h"
 #include "regexp-macro-assembler.h"
 #include "stub-cache.h"
 #include "runtime.h"
 
 namespace v8 {
 namespace internal {
 
 
+void ToNumberStub::InitializeInterfaceDescriptor(
+    Isolate* isolate,
+    CodeStubInterfaceDescriptor* descriptor) {
+  static Register registers[] = { rax };
+  descriptor->register_param_count_ = 1;
+  descriptor->register_params_ = registers;
+  descriptor->deoptimization_handler_ = NULL;
+}
+
+
 void FastCloneShallowArrayStub::InitializeInterfaceDescriptor(
     Isolate* isolate,
     CodeStubInterfaceDescriptor* descriptor) {
   static Register registers[] = { rax, rbx, rcx };
   descriptor->register_param_count_ = 3;
   descriptor->register_params_ = registers;
   descriptor->deoptimization_handler_ =
       Runtime::FunctionForId(Runtime::kCreateArrayLiteralShallow)->entry;
 }
 
@@ skipping 237 matching lines @@
       __ push(descriptor->register_params_[i]);
     }
     ExternalReference miss = descriptor->miss_handler();
     __ CallExternalReference(miss, descriptor->register_param_count_);
   }
 
   __ Ret();
 }
 
 
-void ToNumberStub::Generate(MacroAssembler* masm) {
-  // The ToNumber stub takes one argument in rax.
-  Label check_heap_number, call_builtin;
-  __ SmiTest(rax);
-  __ j(not_zero, &check_heap_number, Label::kNear);
-  __ Ret();
-
-  __ bind(&check_heap_number);
-  __ CompareRoot(FieldOperand(rax, HeapObject::kMapOffset),
-                 Heap::kHeapNumberMapRootIndex);
-  __ j(not_equal, &call_builtin, Label::kNear);
-  __ Ret();
-
-  __ bind(&call_builtin);
-  __ pop(rcx);  // Pop return address.
-  __ push(rax);
-  __ push(rcx);  // Push return address.
-  __ InvokeBuiltin(Builtins::TO_NUMBER, JUMP_FUNCTION);
-}
-
-
 void FastNewClosureStub::Generate(MacroAssembler* masm) {
   // Create a new closure from the given function info in new
   // space. Set the context to the current context in rsi.
   Counters* counters = masm->isolate()->counters();
 
   Label gc;
   __ Allocate(JSFunction::kSize, rax, rbx, rcx, &gc, TAG_OBJECT);
 
   __ IncrementCounter(counters->fast_new_closure_total(), 1);
 
@@ skipping 6497 matching lines @@
   __ bind(&fast_elements_case);
   GenerateCase(masm, FAST_ELEMENTS);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64