[all-commits] [llvm/llvm-project] 0d0eed: [AMDGPU][Legalizer] Widen i16 G_SEXT_INREG (#131308)

[Pierre van Houtryve via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0d0eed419fa362e1932b694e01534f4012dcea97
      https://github.com/llvm/llvm-project/commit/0d0eed419fa362e1932b694e01534f4012dcea97
  Author: Pierre van Houtryve <pierre.vanhoutryve at amd.com>
  Date:   2025-05-07 (Wed, 07 May 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
    M llvm/test/CodeGen/AMDGPU/GlobalISel/ashr.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-abs.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-ashr.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-sext-inreg.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-sext.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-smax.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-smin.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-smulh.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.abs.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/sext_inreg.ll
    M llvm/test/CodeGen/AMDGPU/vector-reduce-smax.ll
    M llvm/test/CodeGen/AMDGPU/vector-reduce-smin.ll

  Log Message:
  -----------
  [AMDGPU][Legalizer] Widen i16 G_SEXT_INREG (#131308)

It's better to widen them to avoid it being lowered into a G_ASHR + G_SHL. With this change we just extend to i32 then trunc the result.



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