[PATCH] D67801: [ARM][LowOverheadLoops] Use subs during revert.

[Sam Parker via Phabricator via llvm-commits]

samparker created this revision.
samparker added reviewers: dmgreen, SjoerdMeijer.
Herald added a subscriber: kristof.beyls.

Check whether there are any uses or defs between the LoopDec and LoopEnd. If there's not, then we can use a subs to set the cpsr and skip generating a cmp.


https://reviews.llvm.org/D67801

Files:
  lib/Target/ARM/ARMLowOverheadLoops.cpp
  test/CodeGen/Thumb2/LowOverheadLoops/branch-targets.ll
  test/CodeGen/Thumb2/LowOverheadLoops/end-positive-offset.mir
  test/CodeGen/Thumb2/LowOverheadLoops/revert-non-header.mir
  test/CodeGen/Thumb2/LowOverheadLoops/revert-while.mir

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