[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]

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.


https://reviews.llvm.org/D36638