Use register arguments for RestParamAccessStub

src/x64/code-stubs-x64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
 #include "src/ic/handler-compiler.h"
@@ skipping 824 matching lines @@
   __ PopReturnAddressTo(rax);
   __ Push(rdi);  // Push function.
   __ Push(rdx);  // Push parameters pointer.
   __ Push(rcx);  // Push parameter count.
   __ PushReturnAddressFrom(rax);
   __ TailCallRuntime(Runtime::kNewSloppyArguments);
 }
 
 
 void RestParamAccessStub::GenerateNew(MacroAssembler* masm) {
-  // rsp[0]  : return address
-  // rsp[8]  : language mode
-  // rsp[16] : index of rest parameter
-  // rsp[24] : number of parameters
-  // rsp[32] : receiver displacement
+  // rcx : number of parameters (tagged)
+  // rdx : parameters pointer
+  // rbx : rest parameter index (tagged)
+  // rdi : language mode (tagged)
+  // rsp[0] : return address
 
   // Check if the calling frame is an arguments adaptor frame.
   Label runtime;
-  __ movp(rdx, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
-  __ movp(rcx, Operand(rdx, StandardFrameConstants::kContextOffset));
-  __ Cmp(rcx, Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
+  __ movp(r8, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
+  __ movp(rax, Operand(r8, StandardFrameConstants::kContextOffset));
+  __ Cmp(rax, Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
   __ j(not_equal, &runtime);
 
   // Patch the arguments.length and the parameters pointer.
   StackArgumentsAccessor args(rsp, 4, ARGUMENTS_DONT_CONTAIN_RECEIVER);
-  __ movp(rcx, Operand(rdx, ArgumentsAdaptorFrameConstants::kLengthOffset));
-  __ movp(args.GetArgumentOperand(1), rcx);
-  __ SmiToInteger64(rcx, rcx);
-  __ leap(rdx, Operand(rdx, rcx, times_pointer_size,
+  __ movp(rcx, Operand(r8, ArgumentsAdaptorFrameConstants::kLengthOffset));
+  __ SmiToInteger64(rax, rcx);
+  __ leap(rdx, Operand(r8, rax, times_pointer_size,
                        StandardFrameConstants::kCallerSPOffset));
-  __ movp(args.GetArgumentOperand(0), rdx);
 
   __ bind(&runtime);
+  __ PopReturnAddressTo(rax);
+  __ Push(rcx);  // Push number of parameters.
+  __ Push(rdx);  // Push parameters pointer.
+  __ Push(rbx);  // Push rest parameter index.
+  __ Push(rdi);  // Push language mode.
+  __ PushReturnAddressFrom(rax);
   __ TailCallRuntime(Runtime::kNewRestParam);
 }
 
 
 void LoadIndexedInterceptorStub::Generate(MacroAssembler* masm) {
   // Return address is on the stack.
   Label slow;
 
   Register receiver = LoadDescriptor::ReceiverRegister();
   Register key = LoadDescriptor::NameRegister();
@@ skipping 4534 matching lines @@
                            kStackSpace, nullptr, return_value_operand, NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64