[all-commits] [llvm/llvm-project] f01fdb: [AMDGPU] Price narrow integer to bfloat vector cas...

[Dmitry Sidorov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f01fdbb2991a10ec7f02fecb3d30fcf4fc639db8
      https://github.com/llvm/llvm-project/commit/f01fdbb2991a10ec7f02fecb3d30fcf4fc639db8
  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

  Log Message:
  -----------
  [AMDGPU] Price narrow integer to bfloat vector casts (#225342)

A vector lane of 9 to 15 or 17 to 31 bits converted to bfloat got the generic cost, which leaves out the rounding. Such a lane is converted to f32 first like any other narrow lane, so price it as the f32 conversion of the same source plus the rounding. Lanes of 8 and 16 bits keep their cost.



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