[llvm] r229311 - [X86][AVX2] vpslldq/vpsrldq byte shifts for AVX2

[Chandler Carruth]

On Wed, Feb 18, 2015 at 12:36 PM, Simon Pilgrim <llvm-dev at redking.me.uk>
wrote:

> Thanks for looking at this Chandler - AFAICT flipping that MatchRight test
> to a MatchLeft equivalent would have been enough to get this working
> correctly again.


FWIW, it would cause it to miss shift-right opportunities, which is why I
didn't like that approach. It was also quite hard to reason about whether
it would be sufficient.
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