Add packed add and subtract to IA32 and X64 assemblers

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 1487 matching lines @@
         } else if (*data == 0x89) {
           data++;
           int mod, regop, rm;
           GetModRm(*data, &mod, &regop, &rm);
           Print("mov_w ");
           data += PrintRightOperand(data);
           Print(",");
           PrintCPURegister(regop);
         } else if (*data == 0x0F) {
           data++;
-          if (*data == 0x2F) {
+          if (*data == 0X6E) {
             data++;
             int mod, regop, rm;
             GetModRm(*data, &mod, &regop, &rm);
-            Print("comisd ");
-            PrintXmmRegister(regop);
-            Print(",");
-            PrintXmmRegister(rm);
-            data++;
-          } else if (*data == 0X6E) {
-            data++;
-            int mod, regop, rm;
-            GetModRm(*data, &mod, &regop, &rm);
             Print("movd ");
             PrintXmmRegister(regop);
             Print(",");
             PrintCPURegister(rm);
             data++;
           } else if (*data == 0X7E) {
             data++;
             int mod, regop, rm;
             GetModRm(*data, &mod, &regop, &rm);
             Print("movd ");
@@ skipping 71 matching lines @@
             PrintXmmRegister(rm);
             data += 2;
           } else if (*data == 0x15) {
             int mod, regop, rm;
             GetModRm(*(data+1), &mod, &regop, &rm);
             Print("unpckhpd ");
             PrintXmmRegister(regop);
             Print(",");
             PrintXmmRegister(rm);
             data += 2;
+          } else if ((*data == 0xFE) || (*data == 0xFA) || (*data == 0x2F)) {
+            const char* mnemonic = NULL;
+            if (*data == 0xFE) mnemonic = "paddd ";
+            if (*data == 0xFA) mnemonic = "psubd ";
+            if (*data == 0x2F) mnemonic = "comisd ";
+            int mod, regop, rm;
+            GetModRm(*(data+1), &mod, &regop, &rm);
+            Print(mnemonic);
+            PrintXmmRegister(regop);
+            Print(",");
+            PrintXmmRegister(rm);
+            data += 2;
           } else {
-            UNIMPLEMENTED();
+              UNIMPLEMENTED();
           }
         } else if (*data == 0x90) {
           data++;
           Print("nop");
         } else {
           UNIMPLEMENTED();
         }
         break;
 
       case 0xFE:
@@ skipping 194 matching lines @@
                                   pc);
     pc += instruction_length;
   }
 
   return;
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32