X64 implementation of native ascii string compare.

src/x64/macro-assembler-x64.h

 // 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
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   // Functions performing a check on a known or potential smi. Returns
   // a condition that is satisfied if the check is successful.
 
   // Is the value a tagged smi.
   Condition CheckSmi(Register src);
 
   // Is the value a positive tagged smi.
   Condition CheckPositiveSmi(Register src);
 
-  // Are both values are tagged smis.
+  // Are both values tagged smis.
   Condition CheckBothSmi(Register first, Register second);
 
+  // Are either value a tagged smi.
+  Condition CheckEitherSmi(Register first, Register second);
+
   // Is the value the minimum smi value (since we are using
   // two's complement numbers, negating the value is known to yield
   // a non-smi value).
   Condition CheckIsMinSmi(Register src);
 
   // Checks whether an 32-bit integer value is a valid for conversion
   // to a smi.
   Condition CheckInteger32ValidSmiValue(Register src);
 
   // Checks whether an 32-bit unsigned integer value is a valid for
@@ skipping 536 matching lines @@
   }                                                                       \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_MACRO_ASSEMBLER_X64_H_