[PATCH] D63364: [x86] split 256-bit vector selects if operands are vector concats

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

Looks ok.
Is there some costmodel here, or do we always (well, when we see concatenation, we don't seem to introduce it
intentionally) want to do this, in the hope that two smaller ops are always at least as good as one wider op?


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https://reviews.llvm.org/D63364