fusl/src/fenv/__flt_rounds.c

#include <float.h>
#include <fenv.h>

int __flt_rounds() {
  switch (fegetround()) {
#ifdef FE_TOWARDZERO
    case FE_TOWARDZERO:
      return 0;
#endif
    case FE_TONEAREST:
      return 1;
#ifdef FE_UPWARD
    case FE_UPWARD:
      return 2;
#endif
#ifdef FE_DOWNWARD
    case FE_DOWNWARD:
      return 3;
#endif
  }
  return -1;
}