[PATCH] D86074: [ARM][MVE] Tail-predication: check get.active.lane.mask's BTC value

[Sjoerd Meijer via Phabricator via llvm-commits]

SjoerdMeijer created this revision.
SjoerdMeijer added reviewers: efriedma, samparker, dmgreen.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls.
Herald added a project: LLVM.
SjoerdMeijer requested review of this revision.

This adds additional checks to see whether it is safe to lower intrinsic get.active.lane.mask to ARM's VCTP which will enable tail-predication. I.e., similarly to several checks already performed on the IV (the first argument of get.active.lane), this adds missing checks that the backedge-taken count (the second argument) is of the form that we expect.


https://reviews.llvm.org/D86074

Files:
  llvm/lib/Target/ARM/MVETailPredication.cpp
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/basic-tail-pred.ll
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/clear-maskedinsts.ll
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/nested.ll
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/tail-pred-const.ll

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