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

runtime/vm/assembler_ia32_test.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/os.h"
 #include "vm/unit_test.h"
@@ skipping 1703 matching lines @@
 }
 
 
 ASSEMBLER_TEST_RUN(XorpdZeroing, entry) {
   typedef double (*XorpdZeroingCode)(double d);
   double res = reinterpret_cast<XorpdZeroingCode>(entry)(12.56e3);
   EXPECT_FLOAT_EQ(0.0, res, 0.0001);
 }
 
 
+ASSEMBLER_TEST_GENERATE(Pxor, assembler) {
+  __ movsd(XMM0, Address(ESP, kWordSize));
+  __ pxor(XMM0, XMM0);
+  __ pushl(EAX);
+  __ pushl(EAX);
+  __ movsd(Address(ESP, 0), XMM0);
+  __ fldl(Address(ESP, 0));
+  __ popl(EAX);
+  __ popl(EAX);
+  __ ret();
+}
+
+
+ASSEMBLER_TEST_RUN(Pxor, entry) {
+  typedef double (*PxorCode)(double d);
+  double res = reinterpret_cast<PxorCode>(entry)(12.3456e3);
+  EXPECT_FLOAT_EQ(0.0, res, 0.0);
+}
+
+
 ASSEMBLER_TEST_GENERATE(Orpd, assembler) {
   __ movsd(XMM0, Address(ESP, kWordSize));
   __ xorpd(XMM1, XMM1);
   __ DoubleNegate(XMM1);
   __ orpd(XMM0, XMM1);
   __ pushl(EAX);
   __ pushl(EAX);
   __ movsd(Address(ESP, 0), XMM0);
   __ fldl(Address(ESP, 0));
   __ popl(EAX);
@@ skipping 329 matching lines @@
                      EAX);
   __ popl(EAX);
   __ popl(CTX);
   __ ret();
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32