[all-commits] [llvm/llvm-project] f7b5f0: [DAG] Fold (and X, (rot (not Y), Z)) -> (and X, (n...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f7b5f0c805c899b59bcc37279a0a05dca35d3a25
      https://github.com/llvm/llvm-project/commit/f7b5f0c805c899b59bcc37279a0a05dca35d3a25
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-10-30 (Wed, 30 Oct 2024)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/test/CodeGen/X86/andnot-patterns.ll

  Log Message:
  -----------
  [DAG] Fold (and X, (rot (not Y), Z)) -> (and X, (not (rot Y, Z)))

On ANDNOT capable targets we can always do this profitably, without ANDNOT we only attempt this if we don't introduce an additional NOT

Followup to #112547



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