[all-commits] [llvm/llvm-project] 909eb8: [AMDGPU] Price scalar integer to fp casts by sourc...

[Dmitry Sidorov via All-commits]

  Branch: refs/heads/users/mrsidims/fix-amdgpu-scalar-int-fp-cast-cost
  Home:   https://github.com/llvm/llvm-project
  Commit: 909eb8b4af3a0f8adf9593b4add67bdefbafc5a0
      https://github.com/llvm/llvm-project/commit/909eb8b4af3a0f8adf9593b4add67bdefbafc5a0
  Author: Dmitry Sidorov <Dmitry.Sidorov at amd.com>
  Date:   2026-09-30 (Wed, 30 Sep 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/AMDGPU/narrow-int-to-bfloat.ll
    M llvm/test/Analysis/CostModel/AMDGPU/narrow-int-to-fp.ll

  Log Message:
  -----------
  [AMDGPU] Price scalar integer to fp casts by source width and sign

Scalar sources between a byte and 31 bits fell to the default cost of one
while the matching vector lanes were already priced, which skewed the
difference SLP weighs a bundle against. Such a source is extended before
the conversion, and what the extension takes depends on the width, on the
sign and on whether the subtarget has SDWA and 16 bit instructions.
Sources narrower than a byte are left alone, because their vector form is
not priced either.


  Commit: 2baabb507c8027e7f14b27b46d16752c51256505
      https://github.com/llvm/llvm-project/commit/2baabb507c8027e7f14b27b46d16752c51256505
  Author: Dmitry Sidorov <Dmitry.Sidorov at amd.com>
  Date:   2026-09-30 (Wed, 30 Sep 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp

  Log Message:
  -----------
  format


  Commit: 3038a18912912ea3d47400868077d7e996ba6bd0
      https://github.com/llvm/llvm-project/commit/3038a18912912ea3d47400868077d7e996ba6bd0
  Author: Dmitry Sidorov <Dmitry.Sidorov at amd.com>
  Date:   2026-09-30 (Wed, 30 Sep 2026)

  Changed paths:
    M llvm/test/CodeGen/AMDGPU/slp-int-to-fp.ll

  Log Message:
  -----------
  update slp-int-to-fp.ll


Compare: https://github.com/llvm/llvm-project/compare/57bbdd7fc8c6...3038a1891291

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