1 #include <math.h> 2 #include <float.h> 3 4 #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024 5 long double fdiml(long double x, long double y) 6 { 7 return fdim(x, y); 8 } 9 #else 10 long double fdiml(long double x, long double y) 11 { 12 if (isnan(x)) 13 return x; 14 if (isnan(y)) 15 return y; 16 return x > y ? x - y : 0; 17 } 18 #endif 19