[all-commits] [llvm/llvm-project] 55d85c: [DAG] visitORCommutative - fold build_pair(not(x), ...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 55d85c84ac01fda633c82e7ba821f6e62352a5c3
      https://github.com/llvm/llvm-project/commit/55d85c84ac01fda633c82e7ba821f6e62352a5c3
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-04-26 (Fri, 26 Apr 2024)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/test/CodeGen/X86/combine-or.ll
    M llvm/test/CodeGen/X86/subvectorwise-store-of-vector-splat.ll

  Log Message:
  -----------
  [DAG] visitORCommutative - fold build_pair(not(x),not(y)) -> not(build_pair(x,y)) style patterns (#90050)

(Sorry, not an actual build_pair node just a similar pattern).

For cases where we're concatenating 2 integers into a double width integer, see if both integer sources are NOT patterns.

We could take this further and handle all logic ops with a constant operands, but I just wanted to handle the case reported on #89533 initially.

Fixes #89533



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