[PATCH] D125987: [SLP] Account for cost of removing FMA opportunities

Mon Aug 29 11:02:38 PDT 2022

fhahn added a comment.
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In D125987#3525414 <https://reviews.llvm.org/D125987#3525414>, @fhahn wrote:

> I think this loss is not only relevant for horizontal reductions, but can pessimize things in general, right?

I stumbled upon an issue on AArch64 where ignoring scalar fusion opportunities notably regresses performance of some SLP sensitive applications. I put up D132872 <https://reviews.llvm.org/D132872> to sketch a potential solution for the non-horizontal reduction case.

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