1#include <math.h>
2#include <stdint.h>
3
4float copysignf(float x, float y)
5{
6	union {float f; uint32_t i;} ux={x}, uy={y};
7	ux.i &= 0x7fffffff;
8	ux.i |= uy.i & 0x80000000;
9	return ux.f;
10}
11