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

[Sam Tebbs via Phabricator via llvm-commits]

samtebbs added inline comments.


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Comment at: llvm/lib/Target/ARM/ARMLowOverheadLoops.cpp:793
+  // If we converted the LoopStart to a t2DoLoopStartTP, we can also remove any
+  // extra instructions in the preheader, which often includes a now unused MOV.
+  if (Start->getOpcode() == ARM::t2DoLoopStartTP && Preheader &&
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Is it guaranteed that these extra instructions are unused (and so it's ok to remove them without any extra RDA checks)?


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D91857/new/

https://reviews.llvm.org/D91857