[Mesa-dev] [PATCH] In emit_math1 check for a zero writemask before emitting the preliminary MOV on gen 6 and up.

[Eric Anholt]

On Fri,  2 Dec 2011 11:29:38 -0800, Stuart Abercrombie <sabercrombie at chromium.org> wrote:
> Previously a zero writemask would result in dst_chan == -1, meaning an
> unnecessary MOV with the destination register dictated by undefined
> memory contents would be emitted before returning.  This caused
> intermittent GPU hangs, e.g. with glean/texCombine.

Nice catch.  I've word-wrapped the commit message and pushed the fix.
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