[PATCH] D141399: [ARM] Don't treat arguments as producesFalseLanesZero

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
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Invalid tail predicated loops could be formed by treating function arguments as FalseLanesZero due to getGlobalReachingDefs not returning any values. Make sure we check that the list of Defs is empty and if so treat it like a unknown value.


https://reviews.llvm.org/D141399

Files:
  llvm/lib/Target/ARM/ARMLowOverheadLoops.cpp
  llvm/test/CodeGen/Thumb2/LowOverheadLoops/mve-reduct-livein-arg.mir

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