X64: Adding macro to load double from memory, and use SSE3 instruction if present.

src/x64/codegen-x64.cc

 // Copyright 2011 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 92 matching lines @@
   Label valid_result;
   Label return_result;
   // If Invalid Operand or Zero Division exceptions are set,
   // return NaN.
   __ testb(rax, Immediate(5));
   __ j(zero, &valid_result);
   __ fstp(0);  // Drop result in st(0).
   int64_t kNaNValue = V8_INT64_C(0x7ff8000000000000);
   __ movq(rcx, kNaNValue, RelocInfo::NONE);
   __ movq(Operand(rsp, kPointerSize), rcx);
-  __ movsd(xmm0, Operand(rsp, kPointerSize));
+  __ LoadDbl(xmm0, Operand(rsp, kPointerSize));
   __ jmp(&return_result);
 
   // If result is valid, return that.
   __ bind(&valid_result);
   __ fstp_d(Operand(rsp, kPointerSize));
-  __ movsd(xmm0, Operand(rsp, kPointerSize));
+  __ LoadDbl(xmm0, Operand(rsp, kPointerSize));
 
   // Clean up FPU stack and exceptions and return xmm0
   __ bind(&return_result);
   __ fstp(0);  // Unload y.
 
   Label clear_exceptions;
   __ testb(rax, Immediate(0x3f /* Any Exception*/));
   __ j(not_zero, &clear_exceptions);
   __ ret(0);
   __ bind(&clear_exceptions);
   __ fnclex();
   __ ret(0);
 
   CodeDesc desc;
   masm.GetCode(&desc);
   // Call the function from C++ through this pointer.
   return FUNCTION_CAST<ModuloFunction>(buffer);
 }
 
 #endif
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64