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[X86][SSE] Improvements to byte shift shuffle matching
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Authored by RKSimon on Nov 25 2014, 11:30 AM.

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Summary

Building on http://reviews.llvm.org/D5699

Since (v)pslldq / (v)psrldq instructions resolve to a single input argument it is useful to match it much earlier than we currently do - this prevents more complicated shuffles (notably insertion into a zero vector) matching before it.

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RKSimon updated this revision to Diff 16629.Nov 25 2014, 11:30 AM
RKSimon retitled this revision from to [X86][SSE] Improvements to byte shift shuffle matching.
RKSimon updated this object.
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chandlerc accepted this revision.Nov 25 2014, 12:58 PM
chandlerc edited edge metadata.

Nice!

This revision is now accepted and ready to land.Nov 25 2014, 12:58 PM
RKSimon closed this revision.Nov 25 2014, 2:35 PM
RKSimon updated this revision to Diff 16632.

Closed by commit rL222796 (authored by @RKSimon).