[Webkit-unassigned] [Bug 271412] New: [JSC] Add a conversion in B3ReduceStrength for the canonical form of the SBFX Pattern detected in B3LowerToAir

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=271412

            Bug ID: 271412
           Summary: [JSC] Add a conversion in B3ReduceStrength for the
                    canonical form of the SBFX Pattern detected in
                    B3LowerToAir
           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: yijia_huang at apple.com

from: (src << amount) >> (amount + lsb)
to: ((src >> lsb) << amount) >> amount  

Note that SBFX_width = dataszize - (amount + lsb).

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