[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

Simon Pilgrim via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Sat Aug 12 05:42:05 PDT 2017

RKSimon added a comment.

In https://reviews.llvm.org/D36638#839669, @craig.topper wrote:

> 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.

+1 for SrcVT as well as ResVT


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