Faster string equals in generated code.

src/x64/code-stubs-x64.h

 // Copyright 2011 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 346 matching lines @@
  private:
   Major MajorKey() { return SubString; }
   int MinorKey() { return 0; }
 
   void Generate(MacroAssembler* masm);
 };
 
 
 class StringCompareStub: public CodeStub {
  public:
-  explicit StringCompareStub() {}
+  StringCompareStub() {}
 
-  // Compare two flat ascii strings and returns result in rax after popping two
-  // arguments from the stack.
+  // Compares two flat ASCII strings and returns result in rax.
   static void GenerateCompareFlatAsciiStrings(MacroAssembler* masm,
                                               Register left,
                                               Register right,
                                               Register scratch1,
                                               Register scratch2,
                                               Register scratch3,
                                               Register scratch4);
 
+  // Compares two flat ASCII strings for equality and returns result
+  // in rax.
+  static void GenerateFlatAsciiStringEquals(MacroAssembler* masm,
+                                            Register left,
+                                            Register right,
+                                            Register scratch1,
+                                            Register scratch2);
+
  private:
   Major MajorKey() { return StringCompare; }
   int MinorKey() { return 0; }
 
   void Generate(MacroAssembler* masm);
 };
 
 
 class NumberToStringStub: public CodeStub {
  public:
@@ skipping 28 matching lines @@
   void Print() {
     PrintF("NumberToStringStub\n");
   }
 #endif
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_CODE_STUBS_X64_H_