[Webkit-unassigned] [Bug 151321] New: B3 should be be clever about choosing which child to reuse for result in two-operand commutative operations

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon Nov 16 13:19:53 PST 2015


https://bugs.webkit.org/show_bug.cgi?id=151321

            Bug ID: 151321
           Summary: B3 should be be clever about choosing which child to
                    reuse for result in two-operand commutative operations
    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

If we have:

    Int32 @3 = Add(@1, @2)

and we know that @1 will die, then we should lower this to:

    Move %tmp1, %tmp3
    Add32 %tmp2, %tmp3

But if we know that @2 will die, then we should lower this to:

    Move %tmp2, %tmp3
    Add32 %tmp1, %tmp3

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