David Green d6327050e0 [AArch64] Use PerfectShuffle costs in AArch64TTIImpl::getShuffleCost
Given a shuffle with 4 elements size 16 or 32, we can use the costs
directly from the PerfectShuffle tables to get a slightly more accurate
cost for the resulting shuffle.

Differential Revision: https://reviews.llvm.org/D123409
2022-04-27 12:09:01 +01:00
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