Add cvtsd2ss into X64 disassembler

runtime/vm/disassembler_x64.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_X64)
 #include "platform/utils.h"
 #include "vm/allocation.h"
@@ skipping 1424 matching lines @@
     // CMOVcc: conditional move.
     int condition = opcode & 0x0F;
     const InstructionDesc& idesc = cmov_instructions[condition];
     byte_size_operand_ = idesc.byte_size_operation;
     current += PrintOperands(idesc.mnem, idesc.op_order_, current);
 
   } else if (opcode == 0x12 || opcode == 0x14 || opcode == 0x15 ||
              opcode == 0x16 || opcode == 0x51 || opcode == 0x52 ||
              opcode == 0x53 || opcode == 0x54 || opcode == 0x56 ||
              opcode == 0x57 || opcode == 0x58 || opcode == 0x59 ||
-             opcode == 0x5C || opcode == 0x5D || opcode == 0x5E ||
-             opcode == 0x5F) {
+             opcode == 0x5A || opcode == 0x5C || opcode == 0x5D ||
+             opcode == 0x5E || opcode == 0x5F) {
     const char* mnemonic = NULL;
     switch (opcode) {
       case 0x12: mnemonic = "movhlps"; break;
       case 0x14: mnemonic = "unpcklps"; break;
       case 0x15: mnemonic = "unpckhps"; break;
       case 0x16: mnemonic = "movlhps"; break;
       case 0x51: mnemonic = "sqrtps"; break;
       case 0x52: mnemonic = "rsqrtps"; break;
       case 0x53: mnemonic = "rcpps"; break;
       case 0x54: mnemonic = "andps"; break;
       case 0x56: mnemonic = "orps"; break;
       case 0x57: mnemonic = "xorps"; break;
       case 0x58: mnemonic = "addps"; break;
       case 0x59: mnemonic = "mulps"; break;
+      case 0x5A: mnemonic = "cvtsd2ss"; break;
       case 0x5C: mnemonic = "subps"; break;
       case 0x5D: mnemonic = "minps"; break;
       case 0x5E: mnemonic = "divps"; break;
       case 0x5F: mnemonic = "maxps"; break;
       default: UNREACHABLE();
     }
     int mod, regop, rm;
     get_modrm(*current, &mod, &regop, &rm);
     AppendToBuffer("%s %s, ", mnemonic, NameOfXMMRegister(regop));
     current += PrintRightXMMOperand(current);
@@ skipping 466 matching lines @@
                                   pc);
     pc += instruction_length;
   }
 
   return;
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64