[PATCH] D134635: [AMDGPU][GlobalISel] Add Shift/Shufflevector Combine

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added a comment.

Also note using legal shuffle_vector is a difference from the DAG we could go back on. Ultimately it's probably fewer total combines to only have to think about 16-bit shifts


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https://reviews.llvm.org/D134635