X64 implementation of native ascii string compare.

src/x64/macro-assembler-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 563 matching lines @@
   if (first.is(second)) {
     return CheckSmi(first);
   }
   movl(kScratchRegister, first);
   orl(kScratchRegister, second);
   testb(kScratchRegister, Immediate(kSmiTagMask));
   return zero;
 }
 
 
+Condition MacroAssembler::CheckEitherSmi(Register first, Register second) {
+  if (first.is(second)) {
+    return CheckSmi(first);
+  }
+  movl(kScratchRegister, first);
+  andl(kScratchRegister, second);
+  testb(kScratchRegister, Immediate(kSmiTagMask));
+  return zero;
+}
+
+
 Condition MacroAssembler::CheckIsMinSmi(Register src) {
   ASSERT(kSmiTag == 0 && kSmiTagSize == 1);
   movq(kScratchRegister, src);
   rol(kScratchRegister, Immediate(1));
   cmpq(kScratchRegister, Immediate(1));
   return equal;
 }
 
 
 Condition MacroAssembler::CheckInteger32ValidSmiValue(Register src) {
@@ skipping 1806 matching lines @@
 CodePatcher::~CodePatcher() {
   // Indicate that code has changed.
   CPU::FlushICache(address_, size_);
 
   // Check that the code was patched as expected.
   ASSERT(masm_.pc_ == address_ + size_);
   ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
 }
 
 } }  // namespace v8::internal