[Webkit-unassigned] [Bug 155240] New: [JSC] Consider converting ArithSub(..., 0) => ToNumber(...)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=155240

            Bug ID: 155240
           Summary: [JSC] Consider converting ArithSub(..., 0) =>
                    ToNumber(...)
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: utatane.tea at gmail.com

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...

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