[all-commits] [llvm/llvm-project] 4a6697: [AMDGPU] Fix and simplify patterns selecting fsub ...

[Jay Foad via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4a6697f3931665e9bf72c7ce7c86f0bc92a5bbe3
      https://github.com/llvm/llvm-project/commit/4a6697f3931665e9bf72c7ce7c86f0bc92a5bbe3
  Author: Jay Foad <jay.foad at amd.com>
  Date:   2026-02-06 (Fri, 06 Feb 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUGISel.td
    M llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h
    M llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h
    M llvm/lib/Target/AMDGPU/AMDGPUInstructions.td
    M llvm/lib/Target/AMDGPU/SIInstrInfo.td
    M llvm/lib/Target/AMDGPU/VOP3PInstructions.td
    M llvm/test/CodeGen/AMDGPU/GlobalISel/combine-fma-sub-ext-mul.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/combine-fma-sub-ext-neg-mul.ll
    M llvm/test/CodeGen/AMDGPU/bf16.ll
    M llvm/test/CodeGen/AMDGPU/fpext-free.ll
    M llvm/test/CodeGen/AMDGPU/mad-mix-bf16.ll
    M llvm/test/CodeGen/AMDGPU/mad-mix.ll

  Log Message:
  -----------
  [AMDGPU] Fix and simplify patterns selecting fsub to v_fma_mix_f32 (#180169)

Select (fsub x, y) -> (fma y, -1.0, x). Using -1.0 as the constant
avoids the need for ComplexPatterns to negate x or y.

This also fixes the bad pattern (fsub x, y) -> (fma -x, 1.0, y).



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