[PATCH] D149001: [InstSimplify] sdiv a (1 srem b) --> a

[Zhu Siyuan via Phabricator via llvm-commits]

floatshadow updated this revision to Diff 516148.
floatshadow added a comment.

use `computeKnownBits()` to check if the divisor can only be zero or one.

another question is can this method replace the original pattern match like `match(Op1, m_One())`? I worry about the performance of `computeKnownBits()`.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D149001/new/

https://reviews.llvm.org/D149001

Files:
  llvm/lib/Analysis/InstructionSimplify.cpp
  llvm/test/Transforms/InstSimplify/div.ll

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