[PATCH] D91857: [ARM] Remove dead mov's in preheader of tail predicated loops

[Dave Green via Phabricator via llvm-commits]

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

With t2DoLoopDec we can be left with some extra MOV's in the preheaders of tail predicated loops. This removes them, in the same way we remove other dead variables.


https://reviews.llvm.org/D91857

Files:
  llvm/lib/Target/ARM/ARMLowOverheadLoops.cpp
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/exitcount.ll
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/mov-operand.ll
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/while-loops.ll
  llvm/test/CodeGen/Thumb2/mve-postinc-dct.ll
  llvm/test/CodeGen/Thumb2/mve-postinc-lsr.ll
  llvm/test/CodeGen/Thumb2/mve-pred-vctpvpsel.ll

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