[PATCH] D154953: [InstCombine] Remove the reminder loop if we know the mask is always true

[Allen zhong via Phabricator via llvm-commits]

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We check the loop trip count is known a power of 2 to determine
whether the tail loop can be eliminated in D146199 <https://reviews.llvm.org/D146199>.
However, the remainder loop of mask scalable loop can also be removed
If we know the mask is always going to be true for every vector iteration.

      

Fix https://github.com/llvm/llvm-project/issues/63616.


https://reviews.llvm.org/D154953

Files:
  llvm/include/llvm/Transforms/InstCombine/InstCombiner.h
  llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
  llvm/test/Transforms/LoopVectorize/AArch64/sve-interleaved-accesses.ll
  llvm/test/Transforms/LoopVectorize/AArch64/sve-widen-phi.ll
  llvm/test/Transforms/LoopVectorize/X86/pr34438.ll
  llvm/test/Transforms/LoopVectorize/pr44488-predication.ll

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