[PATCH] D159367: [ARM] Improve reduction fadd/fmul costs

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
dmgreen added reviewers: samtebbs, NickGuy, SjoerdMeijer.
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This adds some basic fadd/fmul reduction costs for MVE/NEON. It reduces by halving the vector size until it it gets scalarized, with some additional costs for fp16 which may require extracting the top lanes.


https://reviews.llvm.org/D159367

Files:
  llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
  llvm/test/Analysis/CostModel/ARM/reduce-fp.ll

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