X64 implementation of native ascii string compare.

src/x64/assembler-x64.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 898 matching lines @@
   }
 
   void subq(const Operand& dst, Immediate src) {
     immediate_arithmetic_op(0x5, dst, src);
   }
 
   void subl(Register dst, Register src) {
     arithmetic_op_32(0x2B, dst, src);
   }
 
+  void subl(Register dst, const Operand& src) {
+    arithmetic_op_32(0x2B, dst, src);
+  }
+
   void subl(const Operand& dst, Immediate src) {
     immediate_arithmetic_op_32(0x5, dst, src);
   }
 
   void subl(Register dst, Immediate src) {
     immediate_arithmetic_op_32(0x5, dst, src);
   }
 
   void subb(Register dst, Immediate src) {
     immediate_arithmetic_op_8(0x5, dst, src);
@@ skipping 461 matching lines @@
  private:
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_ASSEMBLER_X64_H_