[AMDGPU] Remove AMDGPUISelDAGToDAG::isKnownNeverNaN

[tsymalla]

Summary

This function removes the mentioned function, as it only does two
checks which are already implemented as part of
SelectionDAG::isKnownNeverNaN - which is called there.

[tsymalla]

Remove linter message

[foad]

Remove AMDGPUISelDAGToDAG::isKnownNeverNaN

You actually removed AMDGPUDAGToDAGISel::isNoNanSrc!

llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h

public:
   StringRef getPassName() const override;
   void PostprocessISelDAG() override;
 
 protected:
   void SelectBuildVector(SDNode *N, unsigned RegClassID);
 
 private:
   std::pair<SDValue, SDValue> foldFrameIndex(SDValue N) const;
-  bool isNoNanSrc(SDValue N) const;
   bool isInlineImmediate(const SDNode *N, bool Negated = false) const;
   bool isNegInlineImmediate(const SDNode *N) const {
     return isInlineImmediate(N, true);
   }
 
   bool isInlineImmediate16(int64_t Imm) const {
     return AMDGPU::isInlinableLiteral16(Imm, Subtarget->hasInv2PiInlineImm());
   }

llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp

void AMDGPUDAGToDAGISel::PreprocessISelDAG() {
 
   if (MadeChange) {
     CurDAG->RemoveDeadNodes();
     LLVM_DEBUG(dbgs() << "After PreProcess:\n";
                CurDAG->dump(););
   }
 }
 
-bool AMDGPUDAGToDAGISel::isNoNanSrc(SDValue N) const {
-  if (TM.Options.NoNaNsFPMath)
-    return true;
-
-  // TODO: Move into isKnownNeverNaN
-  if (N->getFlags().hasNoNaNs())
-    return true;
-
-  return CurDAG->isKnownNeverNaN(N);
-}
-
 bool AMDGPUDAGToDAGISel::isInlineImmediate(const SDNode *N,
                                            bool Negated) const {
   if (N->isUndef())
     return true;
 
   const SIInstrInfo *TII = Subtarget->getInstrInfo();
   if (Negated) {
     if (const ConstantSDNode *C = dyn_cast<ConstantSDNode>(N))
bool AMDGPUDAGToDAGISel::SelectVOP3BMods(SDValue In, SDValue &Src,
   }
 
   return false;
 }
 
 bool AMDGPUDAGToDAGISel::SelectVOP3Mods_NNaN(SDValue In, SDValue &Src,
                                              SDValue &SrcMods) const {
   SelectVOP3Mods(In, Src, SrcMods);
-  return isNoNanSrc(Src);
+  return CurDAG->isKnownNeverNaN(Src);
 }
 
 bool AMDGPUDAGToDAGISel::SelectVOP3NoMods(SDValue In, SDValue &Src) const {
   if (In.getOpcode() == ISD::FABS || In.getOpcode() == ISD::FNEG)
     return false;
 
   Src = In;
   return true;