Bug 155240

Summary: [JSC] Consider converting ArithSub(..., 0) => ToNumber(...)
Product: WebKit Reporter: Yusuke Suzuki <ysuzuki>
Component: JavaScriptCoreAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Normal    
Priority: P2    
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Bug Depends on: 154022    
Bug Blocks:    

Description Yusuke Suzuki 2016-03-09 10:28:09 PST 
value - 0 is an idiom to apply ToNumber in JS. (+ 0 is not typically used because "string" + 0 => "string0").
I've run octane and found box2d performs this several times.
(The code `... - 0` can be seen in kraken's fft, dft, etc. But this path is not used in the benchmark run).

Of course, before doing this, we should investigate the impact more...