Change keyed load IC interface on x64 to pass arguments in registers.

src/x64/builtins-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 400 matching lines @@
 
   // Push the receiver.
   __ bind(&push_receiver);
   __ push(rbx);
 
   // Copy all arguments from the array to the stack.
   Label entry, loop;
   __ movq(rax, Operand(rbp, kIndexOffset));
   __ jmp(&entry);
   __ bind(&loop);
-  __ movq(rcx, Operand(rbp, kArgumentsOffset));  // load arguments
-  __ push(rcx);
-  __ push(rax);
+  __ movq(rdx, Operand(rbp, kArgumentsOffset));  // load arguments
 
   // Use inline caching to speed up access to arguments.
   Handle<Code> ic(Builtins::builtin(Builtins::KeyedLoadIC_Initialize));
   __ Call(ic, RelocInfo::CODE_TARGET);
   // It is important that we do not have a test instruction after the
   // call.  A test instruction after the call is used to indicate that
   // we have generated an inline version of the keyed load.  In this
   // case, we know that we are not generating a test instruction next.
 
-  // Remove IC arguments from the stack and push the nth argument.
-  __ addq(rsp, Immediate(2 * kPointerSize));
+  // Push the nth argument.
   __ push(rax);
 
   // Update the index on the stack and in register rax.
   __ movq(rax, Operand(rbp, kIndexOffset));
   __ SmiAddConstant(rax, rax, Smi::FromInt(1));
   __ movq(Operand(rbp, kIndexOffset), rax);
 
   __ bind(&entry);
   __ cmpq(rax, Operand(rbp, kLimitOffset));
   __ j(not_equal, &loop);
@@ skipping 849 matching lines @@
 }
 
 
 void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) {
   Generate_JSEntryTrampolineHelper(masm, true);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64