[all-commits] [llvm/llvm-project] feeabe: [AMDGPU][InstCombine] Fold zero dot operands to ac...

[Harrison Hao via All-commits]

  Branch: refs/heads/users/harrisonGPU/inst-dot-zero
  Home:   https://github.com/llvm/llvm-project
  Commit: feeabeafd5e0807b390b992165fd415c64a1a9ae
      https://github.com/llvm/llvm-project/commit/feeabeafd5e0807b390b992165fd415c64a1a9ae
  Author: Harrison Hao <tsworld1314 at gmail.com>
  Date:   2026-09-21 (Mon, 21 Sep 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp
    M llvm/test/Transforms/InstCombine/AMDGPU/llvm.amdgcn.dot.ll

  Log Message:
  -----------
  [AMDGPU][InstCombine] Fold zero dot operands to accumulator

Fold AMDGPU dot intrinsics when either operand is zero.

`dot(a, 0) = 0` and `dot(0, b) = 0`, so replace the intrinsic with its accumulator.
This avoids unrelated clamp and add/sub reassociation cases.



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