[PATCH] D58361: [x86] allow more 128-bit extract+shufps formation to avoid 256-bit shuffles

[Sanjay Patel via Phabricator via llvm-commits]

spatel added a comment.

Thanks, Peter. 'HasFastVariableShuffle' is a heuristic, so we're never going to get it right all the time, but it sounds like we should leave this particular bit of logic as-is and try to chisel out smaller patterns/transforms for sure wins.

I'll leave this open for a bit in case there are more comments, but I assume we'll abandon it.


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https://reviews.llvm.org/D58361