Is this a compiler bug or my bug?

#include <iostream>
#include <string>
#include <cfenv>

struct raii_feround {
  raii_feround() : value(std::fegetround()) {	 }
 ~raii_feround() { std::fesetround(value); }
  inline void round_up  () const noexcept { std::fesetround(FE_UPWARD  ); }
  inline void round_down() const noexcept { std::fesetround(FE_DOWNWARD); } 
  template<typename T>
  T add(T fst, T snd) const noexcept { return fst + snd; }
private: 
  int value; };

float a = 1.1;
float b = 1.2;
float c = 0;
float d = 0;
    
int main() {   
    {
        raii_feround raii;
        raii.round_up();
        c = raii.add(a, b);
    }
    {
        raii_feround raii;
        raii.round_down();
        d = raii.add(a, b);
    }
    std::cout << c << "\n"; // Output is: 2.3
    std::cout << d << "\n"; // Output is: 2.3 or 2.29999
}