[all-commits] [llvm/llvm-project] a8ed24: [DAGCombiner] Add DAG combine for PARTIAL_REDUCE_M...

[Nicholas Guy via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a8ed244178b90876570b3e0bcf643f027ed83b8a
      https://github.com/llvm/llvm-project/commit/a8ed244178b90876570b3e0bcf643f027ed83b8a
  Author: Nicholas Guy <nicholas.guy at arm.com>
  Date:   2025-05-06 (Tue, 06 May 2025)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/test/CodeGen/AArch64/sve-partial-reduce-dot-product.ll

  Log Message:
  -----------
  [DAGCombiner] Add DAG combine for PARTIAL_REDUCE_MLA when no mul op (#131326)

Generic DAG combine for ISD::PARTIAL_REDUCE_U/SMLA to convert:
PARTIAL_REDUCE_*MLA(Acc, ZEXT(UnextOp1), Splat(1)) into
PARTIAL_REDUCE_UMLA(Acc, UnextOp1, TRUNC(Splat(1))) and
PARTIAL_REDUCE_*MLA(Acc, SEXT(UnextOp1), Splat(1)) into
PARTIAL_REDUCE_SMLA(Acc, UnextOp1, TRUNC(Splat(1))).

---------

Co-authored-by: James Chesterman <james.chesterman at arm.com>



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