[Webkit-unassigned] [Bug 151464] New: B3 should have a story for Ext/Trunc strength reduction

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=151464

            Bug ID: 151464
           Summary: B3 should have a story for Ext/Trunc strength
                    reduction
    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

The LLVM shift operations require the shift amount to have the same type as the shift base. The B3 shift operations require the shift amount to be an Int32. DFG concurs with this. But the initial lowering will probably involve pretending the FTLOutput's shift operations still take an LLVM-style shift amount, and then on B3 they will emit a Trunc. That means that we'll want to be able to constant fold Trunc and be able to fold Trunc(ZExt).

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