[PATCH] D149742: [SLP]Improve isGatherShuffledEntry by trying per-register shuffle.

Mon Jun 5 10:24:03 PDT 2023

ABataev added a comment.

In D149742#4396406 <https://reviews.llvm.org/D149742#4396406>, @vdmitrie wrote:

> Hi Alexey,
>
> I tried to measure performance impact of this patch. Observed ~10% regression on nnet_test spec from coremark-pro test suite. (on avx2 with -flto).

Could you provide more details what is the cause? The patch itself just improves shuffles emissions, most probably there are some problems with the TTI cost model.

Repository:
  rG LLVM Github Monorepo

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https://reviews.llvm.org/D149742