[Webkit-unassigned] [Bug 199891] New: [X86] Emit BT instruction for shift + mask in B3

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199891

            Bug ID: 199891
           Summary: [X86] Emit BT instruction for shift + mask in B3
           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: justin_michaud at apple.com

We should emit the BT instruction for patterns like:
if (a & (1<<b))
if ((a>>b)&1)
if ((~a>>b)&1)
if (~a & (1<<b))

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