[all-commits] [llvm/llvm-project] c22cb5: [GlobalISel] Enable artifact combiner to combine s...

[AE via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: c22cb5bd31ca6a2d1253cedc3f8cc872fb93c17b
      https://github.com/llvm/llvm-project/commit/c22cb5bd31ca6a2d1253cedc3f8cc872fb93c17b
  Author: Amara Emerson <aemerson at apple.com>
  Date:   2020-04-15 (Wed, 15 Apr 2020)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/LegalizationArtifactCombiner.h
    M llvm/test/CodeGen/AArch64/GlobalISel/legalize-sext-zext-128.mir
    M llvm/test/CodeGen/AArch64/GlobalISel/legalizer-combiner.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-ashr.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-lshr.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-shl.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/zextload.ll
    M llvm/test/CodeGen/Mips/GlobalISel/legalizer/ctlz.mir
    M llvm/test/CodeGen/Mips/GlobalISel/legalizer/ctpop.mir
    M llvm/test/CodeGen/Mips/GlobalISel/legalizer/cttz.mir
    M llvm/test/CodeGen/Mips/GlobalISel/legalizer/zextLoad_and_sextLoad.mir
    M llvm/test/CodeGen/Mips/GlobalISel/legalizer/zext_and_sext.mir

  Log Message:
  -----------
  [GlobalISel] Enable artifact combiner to combine starting from a G_MERGE_VALUES.

We generally only combine starting from users to defs in the artifact combiner,
but this doesn't catch cases where at the point of combining a G_UNMERGE we don't
yet have the opposite G_MERGE on input yet since we haven't legalized that far.

This change adds the users of a G_MERGE to the artifact combiner worklist if one
of the uses is a G_UNMERGE or G_TRUNC.

Differential Revision: https://reviews.llvm.org/D77931