Add disassembly of movaps to ia32 disassembler (movaps is better than movsd, avoids stalls etc.)

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 218 matching lines @@
     case 0xBE: return "movsx_b";
     case 0xBF: return "movsx_w";
     case 0xB6: return "movzx_b";
     case 0xB7: return "movzx_w";
     case 0xAF: return "imul";
     case 0xA5: return "shld";
     case 0xAD: return "shrd";
     case 0xAB: return "bts";
     case 0xB1: return "cmpxchg";
     case 0x57: return "xorps";
+    case 0x28: return "movaps";
     default: return NULL;
   }
 }
 
 
 // The implementation of x86 decoding based on the above tables.
 class X86Decoder : public ValueObject {
  public:
   X86Decoder(char* buffer, intptr_t buffer_size)
       : buffer_(buffer),
@@ skipping 948 matching lines @@
             GetModRm(*data, &mod, &regop, &rm);
             data += PrintRightOperand(data);
             if (f0byte == 0xAB) {
               Print(",");
               PrintCPURegister(regop);
             } else {
               Print(",");
               PrintCPURegister(regop);
               Print(",cl");
             }
+          } else if (f0byte == 0x28) {
+            // movaps
+            Print(f0mnem);
+            int mod, regop, rm;
+            GetModRm(*data, &mod, &regop, &rm);
+            Print(" ");
+            PrintXmmRegister(regop);
+            Print(",");
+            data += PrintRightXmmOperand(data);
           } else {
             UNIMPLEMENTED();
           }
         }
       }
         break;
 
       case 0x8F:
       { data++;
         int mod, regop, rm;
@@ skipping 412 matching lines @@
                                   human_buffer,
                                   sizeof(human_buffer),
                                   pc);
     pc += instruction_length;
   }
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32