[all-commits] [llvm/llvm-project] 58e6d0: [AArch64][GlobalISel] Check unmergeSrc is a vector...

[Ryan Cowan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 58e6d02aa28ba48ee37f1b59ad006dfeb45d1dd3
      https://github.com/llvm/llvm-project/commit/58e6d02aa28ba48ee37f1b59ad006dfeb45d1dd3
  Author: Ryan Cowan <ryan.cowan at arm.com>
  Date:   2025-11-19 (Wed, 19 Nov 2025)

  Changed paths:
    M llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
    M llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.cpp
    A llvm/test/CodeGen/AArch64/GlobalISel/combine-unmerge-undef.mir

  Log Message:
  -----------
  [AArch64][GlobalISel] Check unmergeSrc is a vector in matchCombineBuildUnmerge (#168692)

This aims to fix the crash in #168495, my combine rule was
missing a check that the source vector was in fact a vector. This then
caused the legality check to fail in this example as the concat was
trying to concat a non vector.

I have also gated the bitcast of the concat to only work on non-scalable
vectors as the mutation calls `getNumElements` which crashes when called
on a scalable vector.

Fixes #168495



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