[PATCH] D131966: [TypePromotion] Don't promote PHI + ZExt if wider than RegisterBitWidth

[Andre Vieira via Phabricator via llvm-commits]

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There was an issue reported against D111237 <https://reviews.llvm.org/D111237> because for Arm we were promoting a PHI + ZExt chain to i64, causing the existing idiv to require a library routine to perform a 64-bit division. This patch prevents promoting to a width that is wider than the RegisterBitWidth as that is likely to not be beneficial.


https://reviews.llvm.org/D131966

Files:
  llvm/lib/CodeGen/TypePromotion.cpp
  llvm/test/Transforms/TypePromotion/ARM/phi-zext-gep.ll
  llvm/test/Transforms/TypePromotion/ARM/phi-zext-gep2.ll

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