__signbitl.c\math\src - musl - musl - an implementation of the standard library for Linux-based systems

#include "libm.h"
#if (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
int __signbitl(long double x)
{
	union ldshape u = {x};
	return u.i.se >> 15;
}
#elif LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
int __signbitl(long double x)
{
	return __signbit(x);
}
#endif