[Webkit-unassigned] [Bug 153518] New: B3's integer range analysis should know that Mul'ing two sufficiently small numbers will yield a number that still has a meaningful range

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=153518

            Bug ID: 153518
           Summary: B3's integer range analysis should know that Mul'ing
                    two sufficiently small numbers will yield a number
                    that still has a meaningful range
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

I almost added these optimizations to the DFG integer range optimization phase.  That phase is very complicated.  B3's integer range analysis is trivial.  So I added it to B3.

Eventually we'll want this same machinery in DFG also.

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