[PATCH] D69845: [ARM][MVE] canTailPredicateLoop

[Sjoerd Meijer via Phabricator via llvm-commits]

SjoerdMeijer updated this revision to Diff 228656.
SjoerdMeijer added a comment.

- fptrunc/fpextends: the loops are not that bad actually, but there's some quite terrible codegen around that, so let's indeed reject this for now.
- stride -1: I think that should be okay, but I do see that complicates things quite a bit for the backend, so let's indeed reject that for now too.
- this is now enabled/disabled by exisiting option -disable-mve-tail-predication.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D69845/new/

https://reviews.llvm.org/D69845

Files:
  llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
  llvm/lib/Target/ARM/MVETailPredication.cpp
  llvm/test/Transforms/LoopVectorize/ARM/prefer-tail-loop-folding.ll

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