[all-commits] [llvm/llvm-project] 5ec135: [DAGCombiner] Change foldAndOrOfSETCC() to optimiz...

[Konstantina Mitropoulou via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5ec13535235d07eafd64058551bc495f87c283b1
      https://github.com/llvm/llvm-project/commit/5ec13535235d07eafd64058551bc495f87c283b1
  Author: Konstantina Mitropoulou <Konstantina.Mitropoulou at amd.com>
  Date:   2023-08-24 (Thu, 24 Aug 2023)

  Changed paths:
    M llvm/include/llvm/CodeGen/ISDOpcodes.h
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/test/CodeGen/AMDGPU/combine_andor_with_cmps.ll
    M llvm/test/CodeGen/AMDGPU/fma.f16.ll
    M llvm/test/CodeGen/AMDGPU/or.ll

  Log Message:
  -----------
  [DAGCombiner] Change foldAndOrOfSETCC() to optimize and/or patterns with floating points.

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 &&

Reviewed By: arsenm

Differential Revision: https://reviews.llvm.org/D155267