[all-commits] [llvm/llvm-project] 702fd3: [SVE] Fix VLS FMA matching for CodeGenOpt::Aggress...

[Cameron McInally via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 702fd3d323aa88303381ef4244083c1aed84bfc3
      https://github.com/llvm/llvm-project/commit/702fd3d323aa88303381ef4244083c1aed84bfc3
  Author: Cameron McInally <cmcinally at nvidia.com>
  Date:   2021-11-01 (Mon, 01 Nov 2021)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    A llvm/test/CodeGen/AArch64/sve-fixed-length-fp-fma.ll

  Log Message:
  -----------
  [SVE] Fix VLS FMA matching for CodeGenOpt::Aggressive.

For NEON, FMA matching is done in the MachineCombiner, and not the
DAGCombiner. That causes problems with VLS lowering, since the
vectors are fixed width at the DAGCombiner, but are scalable in
the MachineCombiner. This patch corrects it by matching FMAs for
VLS vectors in the DAGCombiner.

Reviewed By: paulwalker-arm

Differential Revision: https://reviews.llvm.org/D112557