1/*	$OpenBSD: signbit.c,v 1.7 2013/07/03 04:46:36 espie Exp $	*/
2/*
3 * Copyright (c) 2008 Martynas Venckus <martynas@openbsd.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#include <sys/types.h>
19#include <machine/ieee.h>
20#include <float.h>
21#include <math.h>
22
23int
24__signbit(double d)
25{
26	struct ieee_double *p = (struct ieee_double *)&d;
27
28	return p->dbl_sign;
29}
30
31int
32__signbitf(float f)
33{
34	struct ieee_single *p = (struct ieee_single *)&f;
35
36	return p->sng_sign;
37}
38
39#if	LDBL_MANT_DIG == DBL_MANT_DIG
40__strong_alias(__signbitl, __signbit);
41#endif	/* LDBL_MANT_DIG == DBL_MANT_DIG */
42