[PATCH] [x86] Fix compile fail in combineX86ShufflesRecursively function in case of IncomingMask has -1 elements

[Chandler Carruth]

On Thu, Aug 14, 2014 at 8:35 AM, Robert Khasanov <rob.khasanov at gmail.com>
wrote:

> Hi chandlerc, nadav,
>
> Fix compile fail in combineX86ShufflesRecursively function in case of
> IncomingMask has -1 elements.
> If IncomingMask[i] = -1 for some i, push -1 to Mask instead of
> OpMask[IncomingMask[i]]
> PR20540
>

I'm pretty confident this is just a superficial fix. I've been working on a
more fundamental fix and should be done soon. This code is just completely
wrong currently.
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