[all-commits] [llvm/llvm-project] ad3904: [DAGCombiner] Attempt to fold 'add' nodes to funne...

[Alex MacLean via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ad39049ec48edcb2ad4024c80f1cadfc9f0e4cb0
      https://github.com/llvm/llvm-project/commit/ad39049ec48edcb2ad4024c80f1cadfc9f0e4cb0
  Author: Alex MacLean <amaclean at nvidia.com>
  Date:   2025-04-04 (Fri, 04 Apr 2025)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/test/CodeGen/AMDGPU/rotate-add.ll
    M llvm/test/CodeGen/ARM/rotate-add.ll
    M llvm/test/CodeGen/NVPTX/rotate-add.ll
    M llvm/test/CodeGen/X86/rotate-add.ll

  Log Message:
  -----------
  [DAGCombiner] Attempt to fold 'add' nodes to funnel-shift or rotate (#125612)

Almost all of the rotate idioms that are valid for an 'or' are also
valid when the halves are combined with an 'add'. Further, many of these
cases are not handled by common bits tracking meaning that the 'add' is
not converted to a 'disjoint or'.



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