[PATCH] D155267: [DAGCombiner] Change foldAndOrOfSETCC() to optimize and/or patterns with floating points.

[Konstantina Mitropoulou via Phabricator via llvm-commits]

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CMP(A,C)||CMP(B,C) => CMP(MIN/MAX(A,B), C)
CMP(A,C)&&CMP(B,C) => CMP(MIN/MAX(A,B), C)

If the operands are proven to be non NaN, then the optimization can be applied
for all predicates.

We can apply the optimization for the following predicates for FMINNUM/FMAXNUM
(for quiet and signaling NaNs) and for FMINNUM_IEEE/FMAXNUM_IEEE if we can prove
that the operands are not signaling NaNs.

- ordered lt/le and ||
- ordered gt/ge and ||
- unordered lt/le and &&
- unordered gt/ge and &&


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D155267

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/AMDGPU/combine_andor_with_cmps.ll
  llvm/test/CodeGen/AMDGPU/fma.f16.ll
  llvm/test/CodeGen/AMDGPU/or.ll

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