[PATCH] D113609: [X86][Costmodel] `getReplicationShuffleCost()`: promote 16 bit-wide elements to 32 bit when no AVX512BW
Roman Lebedev via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Fri Nov 12 10:09:39 PST 2021
lebedev.ri added a comment.
In D113609#3127794 <https://reviews.llvm.org/D113609#3127794>, @RKSimon wrote:
> Can you give more examples of the bad cast costs? trunc <32 x i32> to <32 x i8> -> https://wide.godbolt.org/z/Y3rznPEnY seems to be OK
I wasn't actually saying that `trunc <32 x i32> to <32 x i8>` is bad, i was only describing that the cost should include not only the extensions/truncation, but vector extractions/insertions.
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https://reviews.llvm.org/D113609/new/
https://reviews.llvm.org/D113609
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