[x64] Make use of vxorpd when AVX is enabled.

src/x64/assembler-x64.cc

 // Copyright 2012 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.
 
 #include "src/x64/assembler-x64.h"
 
 #include <cstring>
 
 #if V8_TARGET_ARCH_X64
 
@@ skipping 2431 matching lines @@
 void Assembler::orps(XMMRegister dst, const Operand& src) {
   EnsureSpace ensure_space(this);
   emit_optional_rex_32(dst, src);
   emit(0x0F);
   emit(0x56);
   emit_sse_operand(dst, src);
 }
 
 
 void Assembler::xorps(XMMRegister dst, XMMRegister src) {
+  DCHECK(!IsEnabled(AVX));
   EnsureSpace ensure_space(this);
   emit_optional_rex_32(dst, src);
   emit(0x0F);
   emit(0x57);
   emit_sse_operand(dst, src);
 }
 
 
 void Assembler::xorps(XMMRegister dst, const Operand& src) {
+  DCHECK(!IsEnabled(AVX));
   EnsureSpace ensure_space(this);
   emit_optional_rex_32(dst, src);
   emit(0x0F);
   emit(0x57);
   emit_sse_operand(dst, src);
 }
 
 
 void Assembler::addps(XMMRegister dst, XMMRegister src) {
   EnsureSpace ensure_space(this);
@@ skipping 845 matching lines @@
   EnsureSpace ensure_space(this);
   emit(0x66);
   emit_optional_rex_32(dst, src);
   emit(0x0F);
   emit(0x56);
   emit_sse_operand(dst, src);
 }
 
 
 void Assembler::xorpd(XMMRegister dst, XMMRegister src) {
+  DCHECK(!IsEnabled(AVX));
   EnsureSpace ensure_space(this);
   emit(0x66);
   emit_optional_rex_32(dst, src);
   emit(0x0F);
   emit(0x57);
   emit_sse_operand(dst, src);
 }
 
 
 void Assembler::sqrtsd(XMMRegister dst, XMMRegister src) {
@@ skipping 689 matching lines @@
 
 bool RelocInfo::IsInConstantPool() {
   return false;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64