#include "libm.h"double copysign(double x, double y) {union {double f; uint64_t i;} ux={x}, uy={y};ux.i &= -1ULL/2;ux.i |= uy.i & 1ULL<<63;return ux.f;}
#include "libm.h"double copysign(double x, double y) {union {double f; uint64_t i;} ux={x}, uy={y};ux.i &= -1ULL/2;ux.i |= uy.i & 1ULL<<63;return ux.f;}