X64: A bunch of small fixes.

src/x64/disasm-x64.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1010 matching lines @@
       } else if (opcode == 0x7E) {
         AppendToBuffer("mov%c %s,",
                        rex_w() ? 'q' : 'd',
                        NameOfCPURegister(regop));
         current += PrintRightXMMOperand(current);
       } else {
         const char* mnemonic = "?";
         if (opcode == 0x57) {
           mnemonic = "xorpd";
         } else if (opcode == 0x2E) {
+          mnemonic = "ucomisd";
+        } else if (opcode == 0x2F) {
           mnemonic = "comisd";
-        } else if (opcode == 0x2F) {
-          mnemonic = "ucomisd";
         } else {
           UnimplementedInstruction();
         }
         AppendToBuffer("%s %s,", mnemonic, NameOfXMMRegister(regop));
         current += PrintRightXMMOperand(current);
       }
     }
   } else if (group_1_prefix_ == 0xF2) {
     // Beginning of instructions with prefix 0xF2.
 
@@ skipping 625 matching lines @@
     for (int i = 6 - static_cast<int>(pc - prev_pc); i >= 0; i--) {
       fprintf(f, "  ");
     }
     fprintf(f, "  %s\n", buffer.start());
   }
 }
 
 }  // namespace disasm
 
 #endif  // V8_TARGET_ARCH_X64