Faster filling newly allocated arrays with the holes from the Array construction stub.

src/ia32/disasm-ia32.cc

 // Copyright 2007-2008 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 71 matching lines @@
   {0x90, "nop", UNSET_OP_ORDER},
   {0xF4, "hlt", UNSET_OP_ORDER},
   {0xCC, "int3", UNSET_OP_ORDER},
   {0x60, "pushad", UNSET_OP_ORDER},
   {0x61, "popad", UNSET_OP_ORDER},
   {0x9C, "pushfd", UNSET_OP_ORDER},
   {0x9D, "popfd", UNSET_OP_ORDER},
   {0x9E, "sahf", UNSET_OP_ORDER},
   {0x99, "cdq", UNSET_OP_ORDER},
   {0x9B, "fwait", UNSET_OP_ORDER},
+  {0xFC, "cld", UNSET_OP_ORDER},
   {-1, "", UNSET_OP_ORDER}
 };
 
 
 static ByteMnemonic call_jump_instr[] = {
   {0xE8, "call", UNSET_OP_ORDER},
   {0xE9, "jmp", UNSET_OP_ORDER},
   {-1, "", UNSET_OP_ORDER}
 };
 
@@ skipping 1109 matching lines @@
             int mod, regop, rm;
             get_modrm(*data, &mod, &regop, &rm);
             data += PrintRightOperand(data);
             AppendToBuffer(",%s", NameOfXMMRegister(regop));
           } else {
             UnimplementedInstruction();
           }
         } else if (*(data+1) == 0xA5) {
           data += 2;
           AppendToBuffer("rep_movs");
+        } else if (*(data+1) == 0xAB) {
+          data += 2;
+          AppendToBuffer("rep_stos");
         } else {
           UnimplementedInstruction();
         }
         break;
 
       case 0xF7:
         data += F7Instruction(data);
         break;
 
       default:
@@ skipping 121 matching lines @@
     }
     for (int i = 6 - (pc - prev_pc); i >= 0; i--) {
       fprintf(f, "  ");
     }
     fprintf(f, "  %s\n", buffer.start());
   }
 }
 
 
 }  // namespace disasm