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

src/x64/stub-cache-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 3373 matching lines @@
     // rdx: receiver (a JSObject)
     // rbx: elements array
     // rdi: untagged key
     __ CmpObjectType(rax, HEAP_NUMBER_TYPE, kScratchRegister);
     __ j(not_equal, &slow);
     // No more branches to slow case on this path.
 
     // The WebGL specification leaves the behavior of storing NaN and
     // +/-Infinity into integer arrays basically undefined. For more
     // reproducible behavior, convert these to zero.
-    __ movsd(xmm0, FieldOperand(rax, HeapNumber::kValueOffset));
+    __ LoadDbl(xmm0, FieldOperand(rax, HeapNumber::kValueOffset));
     __ movq(rbx, FieldOperand(rbx, ExternalArray::kExternalPointerOffset));
     // rdi: untagged index
     // rbx: base pointer of external storage
     // top of FPU stack: value
     if (array_type == kExternalFloatArray) {
       __ cvtsd2ss(xmm0, xmm0);
       __ movss(Operand(rbx, rdi, times_4, 0), xmm0);
       __ ret(0);
     } else if (array_type == kExternalDoubleArray) {
       __ movsd(Operand(rbx, rdi, times_8, 0), xmm0);
@@ skipping 58 matching lines @@
   __ TailCallRuntime(Runtime::kSetProperty, 5, 1);
 
   return GetCode(flags);
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64