IR: Add ConstantFP::getNaN()

[• tstellarAMD]

Summary

This is a wrapper around APFloat::getNaN().

include/llvm/IR/Constants.h

   static Constant *get(Type* Ty, double V);
   static Constant *get(Type* Ty, StringRef Str);
   static ConstantFP *get(LLVMContext &Context, const APFloat &V);
+  static Constant *getNaN(Type *Ty, bool Negative = false, unsigned type = 0);
   static Constant *getNegativeZero(Type *Ty);
   static Constant *getInfinity(Type *Ty, bool Negative = false);
 

lib/IR/Constants.cpp

   return C; 
 }
 
+Constant *ConstantFP::getNaN(Type *Ty, bool Negative, unsigned Type) {
+  const fltSemantics &Semantics = *TypeToFloatSemantics(Ty->getScalarType());
+  APFloat NaN = APFloat::getNaN(Semantics, Negative, Type);
+  Constant *C = get(Ty->getContext(), NaN);
+
+  if (VectorType *VTy = dyn_cast<VectorType>(Ty))
+    return ConstantVector::getSplat(VTy->getNumElements(), C);
+
+  return C;
+}
+
 Constant *ConstantFP::getNegativeZero(Type *Ty) {
   const fltSemantics &Semantics = *TypeToFloatSemantics(Ty->getScalarType());
   APFloat NegZero = APFloat::getZero(Semantics, /*Negative=*/true);