[all-commits] [llvm/llvm-project] 388be9: AMDGPU: Fix cost model for 16-bit operations on gfx8

[Matt Arsenault via All-commits]

  Branch: refs/heads/users/arsenm/amdgpu/fix-cost-of-16-bit-ops
  Home:   https://github.com/llvm/llvm-project
  Commit: 388be98f831b28d23c0a7538fe27295744e0102f
      https://github.com/llvm/llvm-project/commit/388be98f831b28d23c0a7538fe27295744e0102f
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2025-06-17 (Tue, 17 Jun 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/AMDGPU/canonicalize.ll
    M llvm/test/Analysis/CostModel/AMDGPU/copysign.ll
    M llvm/test/Transforms/SLPVectorizer/AMDGPU/slp-v2f16.ll

  Log Message:
  -----------
  AMDGPU: Fix cost model for 16-bit operations on gfx8

We should only divide the number of pieces to fit the packed instructions
if we actually have pk instructions. This increases the cost of copysign,
but is closer to the current codegen output. It could be much cheaper
than it is now.



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