[all-commits] [llvm/llvm-project] 4d71f2: [GlobalISel] prevent G_UNMERGE_VALUES for vectors ...

[Robert Imschweiler via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4d71f20b287e398f10bbff55d52bec9683ef89d2
      https://github.com/llvm/llvm-project/commit/4d71f20b287e398f10bbff55d52bec9683ef89d2
  Author: Robert Imschweiler <robert.imschweiler at amd.com>
  Date:   2025-06-18 (Wed, 18 Jun 2025)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/LegalizationArtifactCombiner.h
    M llvm/test/CodeGen/AMDGPU/GlobalISel/insertelement.ll

  Log Message:
  -----------
  [GlobalISel] prevent G_UNMERGE_VALUES for vectors with different elements (#133335)

This commit prevents building a G_UNMERGE_VALUES instruction with
different source and destination vector elements in
`LegalizationArtifactCombiner::ArtifactValueFinder::tryCombineMergeLike()`,
e.g.:
`%1:_(<2 x s8>), %2:_(<2 x s8>) = G_UNMERGE_VALUES %0:_(<2 x s16>)`

This LLVM defect was identified via the AMD Fuzzing project.



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