[all-commits] [llvm/llvm-project] 4a8f2f: [Legalizer] Expand fmaximum and fminimum (#67301)

[Qiu Chaofan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4a8f2f2e1aab027a559c71d4e055db3205ec2e32
      https://github.com/llvm/llvm-project/commit/4a8f2f2e1aab027a559c71d4e055db3205ec2e32
  Author: Qiu Chaofan <qiucofan at cn.ibm.com>
  Date:   2024-04-29 (Mon, 29 Apr 2024)

  Changed paths:
    M llvm/include/llvm/CodeGen/TargetLowering.h
    M llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
    M llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp
    M llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
    M llvm/lib/Target/ARM/ARMISelLowering.cpp
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/ARM/minnum-maxnum-intrinsics.ll
    A llvm/test/CodeGen/PowerPC/fminimum-fmaximum-f128.ll
    A llvm/test/CodeGen/PowerPC/fminimum-fmaximum.ll

  Log Message:
  -----------
  [Legalizer] Expand fmaximum and fminimum (#67301)

According to langref, llvm.maximum/minimum has -0.0 < +0.0 semantics and
propagates NaN.

Expand the nodes on targets not supporting the operation, by adding
extra check for NaN and using is_fpclass to check zero signs.



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