[PATCH] D141329: [AMDGPU] Can sub-dword elements to i32 in concat_vectors

[Stanislav Mekhanoshin via Phabricator via llvm-commits]

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This produces better code by avoiding repacking in some cases.

Fixes: SWDEV-373436


https://reviews.llvm.org/D141329

Files:
  llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
  llvm/test/CodeGen/AMDGPU/vector_shuffle.packed.ll

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