xref: /openbsd-src/lib/libm/src/ld128/s_nanl.c (revision 390c8400525fc0ecc9e2c49c2246076b1b49fe19)
1*390c8400Smartynas /*	$OpenBSD: s_nanl.c,v 1.1 2008/12/09 20:00:35 martynas Exp $	*/
2*390c8400Smartynas /*-
3*390c8400Smartynas  * Copyright (c) 2007 David Schultz
4*390c8400Smartynas  * All rights reserved.
5*390c8400Smartynas  *
6*390c8400Smartynas  * Redistribution and use in source and binary forms, with or without
7*390c8400Smartynas  * modification, are permitted provided that the following conditions
8*390c8400Smartynas  * are met:
9*390c8400Smartynas  * 1. Redistributions of source code must retain the above copyright
10*390c8400Smartynas  *    notice, this list of conditions and the following disclaimer.
11*390c8400Smartynas  * 2. Redistributions in binary form must reproduce the above copyright
12*390c8400Smartynas  *    notice, this list of conditions and the following disclaimer in the
13*390c8400Smartynas  *    documentation and/or other materials provided with the distribution.
14*390c8400Smartynas  *
15*390c8400Smartynas  * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16*390c8400Smartynas  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17*390c8400Smartynas  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18*390c8400Smartynas  * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
19*390c8400Smartynas  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20*390c8400Smartynas  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21*390c8400Smartynas  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22*390c8400Smartynas  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23*390c8400Smartynas  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24*390c8400Smartynas  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25*390c8400Smartynas  * SUCH DAMAGE.
26*390c8400Smartynas  *
27*390c8400Smartynas  * $FreeBSD: src/lib/msun/ld128/s_nanl.c,v 1.3 2008/03/02 20:16:55 das Exp $
28*390c8400Smartynas  */
29*390c8400Smartynas 
30*390c8400Smartynas #include <sys/types.h>
31*390c8400Smartynas #include <machine/ieee.h>
32*390c8400Smartynas #include <math.h>
33*390c8400Smartynas 
34*390c8400Smartynas #include "math_private.h"
35*390c8400Smartynas 
36*390c8400Smartynas long double
nanl(const char * s)37*390c8400Smartynas nanl(const char *s)
38*390c8400Smartynas {
39*390c8400Smartynas 	union {
40*390c8400Smartynas 		long double e;
41*390c8400Smartynas 		struct ieee_ext ieee;
42*390c8400Smartynas 		uint32_t bits[4];
43*390c8400Smartynas 	} u;
44*390c8400Smartynas 
45*390c8400Smartynas 	_scan_nan(u.bits, 4, s);
46*390c8400Smartynas 	u.ieee.ext_exp = 0x7fff;
47*390c8400Smartynas 	u.ieee.ext_frach |= 1U << 15;	/* make it a quiet NaN */
48*390c8400Smartynas 
49*390c8400Smartynas 	return (u.e);
50*390c8400Smartynas }
51