[all-commits] [llvm/llvm-project] 2795ab: [GISel][AMDGPU] Expand ShuffleVector (#124527)

[Alan Li via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2795abb2f8c71a6f00371b49d49829efe2814b0d
      https://github.com/llvm/llvm-project/commit/2795abb2f8c71a6f00371b49d49829efe2814b0d
  Author: Alan Li <me at alanli.org>
  Date:   2025-04-09 (Wed, 09 Apr 2025)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/CombinerHelper.h
    M llvm/include/llvm/Target/GlobalISel/Combine.td
    M llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUCombine.td
    A llvm/test/CodeGen/AMDGPU/GlobalISel/prelegalizer-combiner-shuffle.mir
    A llvm/test/CodeGen/AMDGPU/GlobalISel/shufflevector.ll
    M llvm/test/CodeGen/AMDGPU/buffer-fat-pointers-contents-legalization.ll
    M llvm/test/CodeGen/AMDGPU/integer-mad-patterns.ll
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.raw.tbuffer.store.d16.ll
    M llvm/test/CodeGen/AMDGPU/llvm.amdgcn.struct.tbuffer.store.d16.ll
    M llvm/test/CodeGen/AMDGPU/mad-mix.ll
    M llvm/test/CodeGen/AMDGPU/packed-fp32.ll
    M llvm/test/CodeGen/AMDGPU/vector-reduce-add.ll
    M llvm/test/CodeGen/AMDGPU/vector-reduce-and.ll
    M llvm/test/CodeGen/AMDGPU/vector-reduce-mul.ll
    M llvm/test/CodeGen/AMDGPU/vector-reduce-or.ll
    M llvm/test/CodeGen/AMDGPU/vector-reduce-smax.ll
    M llvm/test/CodeGen/AMDGPU/vector-reduce-smin.ll
    M llvm/test/CodeGen/AMDGPU/vector-reduce-umax.ll
    M llvm/test/CodeGen/AMDGPU/vector-reduce-umin.ll
    M llvm/test/CodeGen/AMDGPU/vector-reduce-xor.ll

  Log Message:
  -----------
  [GISel][AMDGPU] Expand ShuffleVector (#124527)

This patch dismantles G_SHUFFLE_VECTOR before lowering. The original
lowering would emit extract vector element ops. We found that by using
unmerged values the build vector op combine could find ways to fold.

Only enabled on AMDGPU.

This resolves #123631



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