[PATCH] D83907: [ARM] Don't mark vctp as having sideeffects

[Dave Green via Phabricator via llvm-commits]

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

As far as I can tell, it should not be necessary for VCTP to be unpredictable in tail predicated loops. Either it has a a valid loop counter as a operand which will naturally keep it in the right loop, or it doesn't and it won't be converted to a tail predicated loop. Not marking it as having side effects allows it to be scheduled more cleanly for cases where it is not expected to become a tail predicate loop.


https://reviews.llvm.org/D83907

Files:
  llvm/lib/Target/ARM/ARMInstrMVE.td
  llvm/test/CodeGen/Thumb2/mve-float16regloops.ll
  llvm/test/CodeGen/Thumb2/mve-vctp.ll

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