[Webkit-unassigned] [Bug 72878] Strength reduction for Mul and Mod operations for known constants in DFG

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=72878





--- Comment #9 from Yuqiang Xian <yuqiang.xian at intel.com>  2011-11-22 20:00:21 PST ---
Created an attachment (id=116309)
 --> (https://bugs.webkit.org/attachment.cgi?id=116309&action=review)
simple test case

Filip, thanks for the comments!

Here's a very simple test case for constant power of two mul and mod.

Tested on 64bit:

ToT -
constant multiply result: 9999999900000000, in 878 ms
constant modulo result: 50000000, in 784 ms

Patched -
constant multiply result: 9999999900000000, in 721 ms
constant modulo result: 50000000, in 721 ms

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