Revision: 3462
Author: [email protected]
Date: Mon Dec 14 04:18:20 2009
Log: Do a fast check for undefined values when comparing.
Review URL: http://codereview.chromium.org/496008
http://code.google.com/p/v8/source/detail?r=3462
Modified:
/branches/bleeding_edge/src/runtime.js
=======================================
--- /branches/bleeding_edge/src/runtime.js Wed Dec 2 23:56:21 2009
+++ /branches/bleeding_edge/src/runtime.js Mon Dec 14 04:18:20 2009
@@ -121,6 +121,12 @@
if (IS_STRING(this) && IS_STRING(x)) {
return %StringCompare(this, x);
}
+
+ // If one of the operands is undefined, it will convert to NaN and
+ // thus the result should be as if one of the operands was NaN.
+ if (IS_UNDEFINED(this) || IS_UNDEFINED(x)) {
+ return ncr;
+ }
// Default implementation.
var a = %ToPrimitive(this, NUMBER_HINT);
--
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