#include <math.h>/* taken from musl */ #define _sign(d) (*((u64int*)d) & (1ULL<<63)) doublefmax(double x, double y){	if(isNaN(x))		return y;	if(isNaN(y))		return x;	if(_sign(&x) != _sign(&y))		return _sign(&x) ? y : x;	return x < y ? y : x;}