[all-commits] [llvm/llvm-project] aaceba: [AMDGPU] Do not promote uniform i16 operations to ...

[Pierre van Houtryve via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: aacebaeab5448b4ef614aa8aca52ca210e451f79
      https://github.com/llvm/llvm-project/commit/aacebaeab5448b4ef614aa8aca52ca210e451f79
  Author: Pierre van Houtryve <pierre.vanhoutryve at amd.com>
  Date:   2025-05-16 (Fri, 16 May 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUCodeGenPrepare.cpp
    M llvm/test/CodeGen/AMDGPU/GlobalISel/add.v2i16.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/ashr.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/lshr.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/mul.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/sext_inreg.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/shl-ext-reduce.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/shl.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/sub.v2i16.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/xnor.ll
    M llvm/test/CodeGen/AMDGPU/add.v2i16.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.1024bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.128bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.160bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.192bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.224bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.256bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.288bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.320bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.32bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.352bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.384bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.448bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.512bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.576bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.640bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.64bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.704bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.768bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.832bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.896bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.960bit.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.96bit.ll
    M llvm/test/CodeGen/AMDGPU/anyext.ll
    M llvm/test/CodeGen/AMDGPU/ashr.v2i16.ll
    M llvm/test/CodeGen/AMDGPU/bitreverse.ll
    M llvm/test/CodeGen/AMDGPU/calling-conventions.ll
    M llvm/test/CodeGen/AMDGPU/cgp-bitfield-extract.ll
    M llvm/test/CodeGen/AMDGPU/ctlz.ll
    M llvm/test/CodeGen/AMDGPU/ctlz_zero_undef.ll
    M llvm/test/CodeGen/AMDGPU/cttz.ll
    M llvm/test/CodeGen/AMDGPU/cttz_zero_undef.ll
    M llvm/test/CodeGen/AMDGPU/fneg.ll
    M llvm/test/CodeGen/AMDGPU/lshr.v2i16.ll
    M llvm/test/CodeGen/AMDGPU/min.ll
    M llvm/test/CodeGen/AMDGPU/sdwa-peephole.ll
    M llvm/test/CodeGen/AMDGPU/sext-in-reg.ll
    M llvm/test/CodeGen/AMDGPU/shl.v2i16.ll
    M llvm/test/CodeGen/AMDGPU/sminmax.v2i16.ll
    M llvm/test/CodeGen/AMDGPU/sra.ll
    M llvm/test/CodeGen/AMDGPU/sub.v2i16.ll
    M llvm/test/CodeGen/AMDGPU/widen-smrd-loads.ll
    M llvm/test/CodeGen/AMDGPU/zero_extend.ll

  Log Message:
  -----------
  [AMDGPU] Do not promote uniform i16 operations to i32 in CGP (#140208)

For the majority of cases, this is a neutral or positive change.
There are even testcases that greatly benefit from it, but some regressions are possible.
There is #140040 for GlobalISel that'd need to be fixed but it's only a one instruction regression and I think it can be fixed later.

Solves #64591



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