[PATCH] D91287: [ARM] Ensure CountReg definition dominates InsertPt when creating t2DoLoopStartTP

[Dave Green via Phabricator via llvm-commits]

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

Of course there was something missing, in this case a check that the def of the count register we are adding to a t2DoLoopStartTP would dominate the insertion point.

In the future, when we remove some of these COPY's in between, the t2DoLoopStartTP will always become the last instruction in the block, preventing this from happening. In the meantime we need to check they are created in a sensible order.


https://reviews.llvm.org/D91287

Files:
  llvm/lib/Target/ARM/MVEVPTOptimisationsPass.cpp
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/count_dominates_start.mir

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