[PATCH] D114071: [X86][Costmodel] `getReplicationShuffleCost()`: promote 1 bit-wide elements to 8 bit when have AVX512BW+AVX512VBMI

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added inline comments.


================
Comment at: llvm/lib/Target/X86/X86TargetTransformInfo.cpp:3677
     }
     return bailout();
   default:
----------------
RKSimon wrote:
> AVX512F will use (pretty awful) vXi32 shuffles: https://simd.godbolt.org/z/YYzjaf7Wh
Yes, those are pretty awful, i'm not sure if there's much hope for plain AVX512F,
we need AVX512BW or AVX512DQ for this i'd say.


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  https://reviews.llvm.org/D114071/new/

https://reviews.llvm.org/D114071