[PATCH] D92369: [ARM] Improve handling of empty VPT blocks in tail predicated loops

[Dave Green via Phabricator via llvm-commits]

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

A vpt block that just contains either VPST;VCTP or VPT;VCTP, once the VCTP is removed will become invalid. This fixed the first by removing the now empty block and bails out for the second, as we have no simple way of converting a VPT to a VCMP.


https://reviews.llvm.org/D92369

Files:
  llvm/lib/Target/ARM/ARMLowOverheadLoops.cpp
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/vpt-blocks.mir

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