[all-commits] [llvm/llvm-project] cc65e0: [GlobalISel][Legalizer] Use ArtifactValueFinder fi...

[Amara Emerson via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cc65e08fe7e1402cd6549882879f50e5238e8178
      https://github.com/llvm/llvm-project/commit/cc65e08fe7e1402cd6549882879f50e5238e8178
  Author: Amara Emerson <amara at apple.com>
  Date:   2021-09-21 (Tue, 21 Sep 2021)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/LegalizationArtifactCombiner.h
    M llvm/test/CodeGen/AArch64/GlobalISel/legalize-extract-vector-elt.mir
    M llvm/test/CodeGen/AArch64/GlobalISel/legalize-load-store.mir
    M llvm/test/CodeGen/AArch64/GlobalISel/legalize-shuffle-vector.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-fshl.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-fshr.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-insert-vector-elt.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-llvm.amdgcn.image.load.2d.d16.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.image.load.1d.d16.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/xnor.ll

  Log Message:
  -----------
  [GlobalISel][Legalizer] Use ArtifactValueFinder first for unmerge combines before trying others.

This is motivated by an pathological compile time issue during unmerge combining.

We should be able to use the AVF to do simplification. However AMDGPU
has a lot of codegen changes which I'm not sure how to evaluate.

Differential Revision: https://reviews.llvm.org/D109748