[Webkit-unassigned] [Bug 169254] New: Air should have a way of expressing a register being clobbered by an instruction before some other operand in that same instruction is set

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=169254

            Bug ID: 169254
           Summary: Air should have a way of expressing a register being
                    clobbered by an instruction before some other operand
                    in that same instruction is set
    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

AtomicStrongCAS clobbers both eax and whatever you choose to hold the boolean result.  The boolean result is set after eax is set.  So the boolean result could use eax if eax is otherwise unused.  But, we currently fail at this.

This is one of those things that is very likely to be super complex and very unlikely to be super profitable, but it's worth thinking about in case some easy solution does present itself.

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