[PATCH] D36638: [AVX512] Correct isExtractSubvectorCheap so that it will return true for extracting 128-bits from the upper 256-bits of a 512-bit vector

Craig Topper via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Fri Aug 11 14:33:47 PDT 2017

craig.topper added a comment.

I also wonder if this interface shouldn't take the source type as input. In case some other target has multiple legal vector sizes but can't extract a quarter of vector like x86 can.


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