[all-commits] [llvm/llvm-project] 344a49: [CodeGen] Simplify expandRoundInexactToOdd (#134988)

[Jay Foad via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 344a491dad1ec117ea0f97eb09c56fe5edb51fe6
      https://github.com/llvm/llvm-project/commit/344a491dad1ec117ea0f97eb09c56fe5edb51fe6
  Author: Jay Foad <jay.foad at amd.com>
  Date:   2025-04-10 (Thu, 10 Apr 2025)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
    M llvm/test/CodeGen/AMDGPU/bf16-conversions.ll
    M llvm/test/CodeGen/AMDGPU/bf16.ll
    M llvm/test/CodeGen/AMDGPU/fp_trunc_store_fp64_to_bf16.ll

  Log Message:
  -----------
  [CodeGen] Simplify expandRoundInexactToOdd (#134988)

FP_ROUND and FP_EXTEND the input value before FABSing it. This avoids
some bit twiddling to copy the sign bit from the input to the result. It
does introduce one extra FABS, but that is folded into another
instruction for free on AMDGPU, which is the only target currently
affected by this change.



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