[all-commits] [llvm/llvm-project] 3363d2: [InstCombine] Do not simplify lshr/shl arg if it i...

[quic-eikansh via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3363d23bd39970cbd5e32bfca6892ffd97ceb023
      https://github.com/llvm/llvm-project/commit/3363d23bd39970cbd5e32bfca6892ffd97ceb023
  Author: Eikansh Gupta <quic_eikagupt at quicinc.com>
  Date:   2024-02-16 (Fri, 16 Feb 2024)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
    M llvm/test/Transforms/InstCombine/fsh.ll

  Log Message:
  -----------
  [InstCombine] Do not simplify lshr/shl arg if it is part of a rotate pattern

fshl/fshr having first two arguments as same gets lowered to target
specific rotate. But based on the uses, one of the arguments can get
simplified resulting in different arguments performing equivalent
operation.

This patch prevents the simplification of the arguments of lshr/shl if
they are part of fshl pattern.

Closes https://github.com/llvm/llvm-project/pull/73441.



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