[all-commits] [llvm/llvm-project] ada2fb: [GISel] Fix ShuffleVector assert (#139769)

[Alan Li via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ada2fbfe36c83cc7c575da70b7eae8c12483f758
      https://github.com/llvm/llvm-project/commit/ada2fbfe36c83cc7c575da70b7eae8c12483f758
  Author: Alan Li <me at alanli.org>
  Date:   2025-05-20 (Tue, 20 May 2025)

  Changed paths:
    M llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
    A llvm/test/CodeGen/AMDGPU/GlobalISel/bug_shuffle_vector_to_scalar.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/prelegalizer-combiner-shuffle.mir

  Log Message:
  -----------
  [GISel] Fix ShuffleVector assert (#139769)

Fixes issue: https://github.com/llvm/llvm-project/issues/139752

When G_SHUFFLE_VECTOR has only 1 element then it is possible the vector
is decayed into a scalar.



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