[Webkit-unassigned] [Bug 138523] [JSC] Lower switch statements at LLVM IR level when using FastISel.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=138523

--- Comment #4 from Juergen Ributzka <juergen at apple.com> ---
(In reply to comment #2)
> Comment on attachment 241210 [details]
> Patch
> 
> r=me
> 
> Is there any downside to lowering early? Does this prevent
> lookup-table-based switch?

Yes, it prevents lookup-table-based switches, but FastISel isn't supporting them anyways. I haven't seen a performance regression yet, but we can revisit this if it should become a problem. The important thing here is that you don't want to fall-back to SelectionDAG, which would increase compile time.

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