Add generated code for ascii string comparison...

src/ia32/codegen-ia32.h

 // Copyright 2006-2008 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 529 matching lines @@
 
   // Fast support for Math.random().
   void GenerateRandomPositiveSmi(ZoneList<Expression*>* args);
 
   // Fast support for StringAdd.
   void GenerateStringAdd(ZoneList<Expression*>* args);
 
   // Fast support for SubString.
   void GenerateSubString(ZoneList<Expression*>* args);
 
+  // Fast support for StringCompare.
+  void GenerateStringCompare(ZoneList<Expression*>* args);
+
   // Support for direct calls from JavaScript to native RegExp code.
   void GenerateRegExpExec(ZoneList<Expression*>* args);
 
   // Simple condition analysis.
   enum ConditionAnalysis {
     ALWAYS_TRUE,
     ALWAYS_FALSE,
     DONT_KNOW
   };
   ConditionAnalysis AnalyzeCondition(Expression* cond);
@@ skipping 237 matching lines @@
   SubStringStub() {}
 
  private:
   Major MajorKey() { return SubString; }
   int MinorKey() { return 0; }
 
   void Generate(MacroAssembler* masm);
 };
 
 
+class StringCompareStub: public StringStubBase {
+ public:
+  explicit StringCompareStub() {
+  }
+
+  // Compare two flat ascii strings and returns result in eax after popping two
+  // arguments from the stack. Due to the instructions used there are certain
+  // constraints on the registers that can be passed.
+  //   counter must be ecx
+  //   scratch1 most be one of eax, ebx or edx
+  static void GenerateCompareFlatAsciiStrings(MacroAssembler* masm,
+                                              Register left,
+                                              Register right,
+                                              Register counter,
+                                              Register scratch1,
+                                              Register scratch2);
+
+ private:
+  Major MajorKey() { return StringCompare; }
+  int MinorKey() { return 0; }
+
+  void Generate(MacroAssembler* masm);
+};
+
+
 } }  // namespace v8::internal
 
 #endif  // V8_IA32_CODEGEN_IA32_H_