refactor test instruction on ia32

src/x64/assembler-x64.cc

 // Copyright 2012 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 2040 matching lines @@
     emit_modrm(src, dst);
   } else {
     emit_rex_64(dst, src);
     emit(0x85);
     emit_modrm(dst, src);
   }
 }
 
 
 void Assembler::testq(Register dst, Immediate mask) {
+  if (is_uint8(mask.value_)) {
+    testb(dst, mask);
+    return;
+  }
   EnsureSpace ensure_space(this);
   if (dst.is(rax)) {
     emit_rex_64();
     emit(0xA9);
     emit(mask);
   } else {
     emit_rex_64(dst);
     emit(0xF7);
     emit_modrm(0, dst);
     emit(mask);
@@ skipping 976 matching lines @@
 bool RelocInfo::IsCodedSpecially() {
   // The deserializer needs to know whether a pointer is specially coded.  Being
   // specially coded on x64 means that it is a relative 32 bit address, as used
   // by branch instructions.
   return (1 << rmode_) & kApplyMask;
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64