Changeset 35309 in webkit for trunk/JavaScriptCore/kjs/JSImmediate.h

Timestamp:

Jul 23, 2008, 5:49:46 PM (17 years ago)

Author:

[email protected]

Message:

Improve switch performance.

Reviewed by Geoff Garen and Sam Weinig.

Improve switch performance by converting to a hashmap based jump
table to avoid the sequence of dispatches that would otherwise be
needed. This results in a 9-19x performance win for string switches
based on ad hoc testing, and a 6x improvement for integer switch
statements. SunSpider reports a 1.2% progression.

File:

• trunk/JavaScriptCore/kjs/JSImmediate.h (modified) (1 diff)

trunk/JavaScriptCore/kjs/JSImmediate.h

@@ -71 +71 @@
             return (getTag(v) == NumberType);
         }
-        
+
         static ALWAYS_INLINE bool isPositiveNumber(const JSValue* v)
         {