Expand fast case of parseInt to include radix == 10 and radix == 0.

src/v8natives.js

 // 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 74 matching lines @@
 function GlobalIsFinite(number) {
   if (!IS_NUMBER(number)) number = NonNumberToNumber(number);
 
   // NaN - NaN == NaN, Infinity - Infinity == NaN, -Infinity - -Infinity == NaN.
   return %_IsSmi(number) || number - number == 0;
 }
 
 
 // ECMA-262 - 15.1.2.2
 function GlobalParseInt(string, radix) {
-  if (IS_UNDEFINED(radix)) {
+  if (IS_UNDEFINED(radix) || radix == 10 || radix == 0) {

[Erik Corry, 2011/02/22 08:53:05]

I think you want === here.

[Mads Ager (chromium), 2011/02/22 08:53:55]

Erik suggests using === here. I agree with that and we should do so below as
well (the checks before %_GetCachedArrayIndex).

[sandholm, 2011/02/22 08:59:57]

Done.

[sandholm, 2011/02/22 08:59:57]

Done.

     // Some people use parseInt instead of Math.floor.  This
     // optimization makes parseInt on a Smi 12 times faster (60ns
     // vs 800ns).  The following optimization makes parseInt on a
     // non-Smi number 9 times faster (230ns vs 2070ns).  Together
     // they make parseInt on a string 1.4% slower (274ns vs 270ns).
     if (%_IsSmi(string)) return string;
     if (IS_NUMBER(string) &&
         ((0.01 < string && string < 1e9) ||
             (-1e9 < string && string < -0.01))) {
       // Truncate number.
@@ skipping 1137 matching lines @@
 // ----------------------------------------------------------------------------
 
 function SetupFunction() {
   InstallFunctions($Function.prototype, DONT_ENUM, $Array(
     "bind", FunctionBind,
     "toString", FunctionToString
   ));
 }
 
 SetupFunction();