Add fast 64-bit bitwise negation to the IA32 optimizing compiler.

runtime/vm/assembler_ia32.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/assembler.h"
 #include "vm/heap.h"
 #include "vm/memory_region.h"
@@ skipping 779 matching lines @@
   ASSERT(CPUFeatures::sse4_1_supported());
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0x66);
   EmitUint8(0x0F);
   EmitUint8(0x38);
   EmitUint8(0x29);
   EmitXmmRegisterOperand(dst, src);
 }
 
 
+void Assembler::pxor(XmmRegister dst, XmmRegister src) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x66);
+  EmitUint8(0x0F);
+  EmitUint8(0xEF);
+  EmitXmmRegisterOperand(dst, src);
+}
+
+
 void Assembler::fldl(const Address& src) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0xDD);
   EmitOperand(0, src);
 }
 
 
 void Assembler::fstpl(const Address& dst) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0xDD);
@@ skipping 1182 matching lines @@
 
 const char* Assembler::XmmRegisterName(XmmRegister reg) {
   ASSERT((0 <= reg) && (reg < kNumberOfXmmRegisters));
   return xmm_reg_names[reg];
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32