[PATCH] D126778: [LoopVectorize] Add FastMathFlags to the select used for reductions with tail-folding

[David Sherwood via Phabricator via llvm-commits]

david-arm created this revision.
david-arm added reviewers: sdesmalen, spatel, kmclaughlin, CarolineConcatto, peterwaller-arm.
Herald added subscribers: dmgreen, hiraditya.
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david-arm requested review of this revision.
Herald added a project: LLVM.
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Based on reviewer comments on https://reviews.llvm.org/D126692 I've
added FastMathFlags to the select instruction used when tail-folding
with reductions. These flags can then be used by InstCombine to
decide upon the most optimal floating point identity value for
fadd/fsub. Doing so unlocks further optimisations, such as folding


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D126778

Files:
  llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
  llvm/test/Transforms/LoopVectorize/ARM/mve-reduction-predselect.ll
  llvm/test/Transforms/LoopVectorize/ARM/mve-reduction-types.ll
  llvm/test/Transforms/LoopVectorize/reduction-predselect.ll

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