[all-commits] [llvm/llvm-project] 613222: [DAGCombiner] Remove `UnsafeFPMath` usage in `visi...

[paperchalice via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 613222ec332bb698fc053e22619270032c305c2c
      https://github.com/llvm/llvm-project/commit/613222ec332bb698fc053e22619270032c305c2c
  Author: paperchalice <liujunchang97 at outlook.com>
  Date:   2025-06-30 (Mon, 30 Jun 2025)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp
    M llvm/test/CodeGen/AMDGPU/fma-combine.ll
    M llvm/test/CodeGen/AMDGPU/fmul-2-combine-multi-use.ll
    M llvm/test/CodeGen/AMDGPU/mad-combine.ll
    A llvm/test/CodeGen/AMDGPU/rsq.f32-safe.ll
    M llvm/test/CodeGen/AMDGPU/rsq.f32.ll
    M llvm/test/CodeGen/NVPTX/frem.ll
    M llvm/test/CodeGen/NVPTX/sqrt-approx.ll
    M llvm/test/CodeGen/PowerPC/fma-combine.ll
    M llvm/test/CodeGen/X86/change-unsafe-fp-math.ll
    M llvm/test/CodeGen/X86/fdiv.ll

  Log Message:
  -----------
  [DAGCombiner] Remove `UnsafeFPMath` usage in `visitFSUBForFMACombine` etc. (#145637)

Remove `UnsafeFPMath` in `visitFMULForFMADistributiveCombine`,
`visitFSUBForFMACombine` and `visitFDIV`.
All affected tests are fixed by add fast math flags manually.
Propagate fast math flags when lowering fdiv in NVPTX backend, so it can
produce optimized dag when `unsafe-fp-math` is absent.



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