b-a+a <= b failure

#include <fenv.h>
#include <math.h>
#include <stdio.h>


int main(void)
{
  fesetround(FE_UPWARD);
  float smallest = nextafterf(0.f, 1.f);
  float cur, prev;
  for(cur = prev = smallest; cur < HUGE_VALF;
      prev = cur, cur = nextafterf(cur, HUGE_VALF)) {
    if(cur - smallest + smallest > cur)
      printf("Failed %1$g - %2$g + %2$g <= %1$g\n", cur, smallest);
    if(cur - prev + prev > cur)
      printf("Failed %1$g - %2$g + %2$g <= %1$g\n", cur, prev);
  }
}