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Simon Pilgrim
444b60212b
AArch64 was only setting costs for SK_Transpose, which meant that many of the simpler shuffles (e.g. SK_Select and SK_PermuteSingleSrc for larger vector elements) was being severely overestimated by the default shuffle expansion. This patch adds costs to help improve SLP performance and avoid a regression in reductions introduced by D48174. I'm not very knowledgeable about AArch64 shuffle lowering so I've kept the extra costs to a minimum - someone who knows this code can add extra costs which should improve vectorization a lot more. Differential Revision: https://reviews.llvm.org/D48172 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335329 91177308-0d34-0410-b5e6-96231b3b80d8