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

runtime/vm/disassembler_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/disassembler.h"
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
 #include "platform/utils.h"
 #include "vm/allocation.h"
@@ skipping 1478 matching lines @@
             data += 4;
             Print("nop");
           } else if (*data == 0x50) {
             Print("movmskpd ");
             data++;
             int mod, regop, rm;
             GetModRm(*data, &mod, &regop, &rm);
             PrintCPURegister(regop);
             Print(",");
             data += PrintRightXmmOperand(data);
-          } else if (*data == 0x3A &&
-                     *(data+1) == 0x16) {
+          } else if (*data == 0x3A && *(data+1) == 0x16) {
             Print("pextrd ");
             data += 2;
             int mod, regop, rm;
             GetModRm(*data, &mod, &regop, &rm);
             PrintCPURegister(rm);
             Print(",");
             PrintXmmRegister(regop);
             Print(",");
             PrintHex(*(data+1));
             data += 2;
           } else if (*data == 0x38) {
             data += Packed660F38Instruction(data);
+          } else if (*data == 0xEF) {
+            int mod, regop, rm;
+            GetModRm(*(data+1), &mod, &regop, &rm);
+            Print("pxor ");
+            PrintXmmRegister(regop);
+            Print(",");
+            PrintXmmRegister(rm);
+            data += 2;
           } else {
             UNIMPLEMENTED();
           }
         } else if (*data == 0x90) {
           data++;
           Print("nop");
         } else {
           UNIMPLEMENTED();
         }
         break;
@@ skipping 188 matching lines @@
                                   human_buffer,
                                   sizeof(human_buffer),
                                   pc);
     pc += instruction_length;
   }
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32