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Unverified Commit a70d7432 authored by Roman Lebedev's avatar Roman Lebedev
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[X86][Costmodel] `getReplicationShuffleCost()`: implement cost model for 8... 

[X86][Costmodel] `getReplicationShuffleCost()`: implement cost model for 8 bit-wide elements with AVX512VBMI

VBMI introduced VPERMB, so cost-model i8 replication shuffle using it.
Note that we can still model i8 replication shufflle without VBMI,
by promoting to i16/i32. That will be done in follow-ups.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D113479
parent c6e894b9
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