1*84d9c625SLionel Sambuc /* $NetBSD: s_frexpl.c,v 1.3 2013/02/12 21:40:19 martin Exp $ */
2*84d9c625SLionel Sambuc
3*84d9c625SLionel Sambuc /*-
4*84d9c625SLionel Sambuc * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG>
5*84d9c625SLionel Sambuc * All rights reserved.
6*84d9c625SLionel Sambuc *
7*84d9c625SLionel Sambuc * Redistribution and use in source and binary forms, with or without
8*84d9c625SLionel Sambuc * modification, are permitted provided that the following conditions
9*84d9c625SLionel Sambuc * are met:
10*84d9c625SLionel Sambuc * 1. Redistributions of source code must retain the above copyright
11*84d9c625SLionel Sambuc * notice, this list of conditions and the following disclaimer.
12*84d9c625SLionel Sambuc * 2. Redistributions in binary form must reproduce the above copyright
13*84d9c625SLionel Sambuc * notice, this list of conditions and the following disclaimer in the
14*84d9c625SLionel Sambuc * documentation and/or other materials provided with the distribution.
15*84d9c625SLionel Sambuc *
16*84d9c625SLionel Sambuc * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17*84d9c625SLionel Sambuc * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18*84d9c625SLionel Sambuc * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19*84d9c625SLionel Sambuc * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20*84d9c625SLionel Sambuc * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21*84d9c625SLionel Sambuc * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22*84d9c625SLionel Sambuc * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23*84d9c625SLionel Sambuc * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24*84d9c625SLionel Sambuc * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25*84d9c625SLionel Sambuc * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26*84d9c625SLionel Sambuc * SUCH DAMAGE.
27*84d9c625SLionel Sambuc *
28*84d9c625SLionel Sambuc * $FreeBSD: src/lib/msun/src/s_frexpl.c,v 1.1 2005/03/07 04:54:51 das Exp $
29*84d9c625SLionel Sambuc */
30*84d9c625SLionel Sambuc
31*84d9c625SLionel Sambuc #include <sys/cdefs.h>
32*84d9c625SLionel Sambuc __RCSID("$NetBSD: s_frexpl.c,v 1.3 2013/02/12 21:40:19 martin Exp $");
33*84d9c625SLionel Sambuc
34*84d9c625SLionel Sambuc #include <machine/ieee.h>
35*84d9c625SLionel Sambuc #include <float.h>
36*84d9c625SLionel Sambuc #include <math.h>
37*84d9c625SLionel Sambuc
38*84d9c625SLionel Sambuc #include "math_private.h"
39*84d9c625SLionel Sambuc
40*84d9c625SLionel Sambuc #ifdef __HAVE_LONG_DOUBLE
41*84d9c625SLionel Sambuc #if LDBL_MAX_EXP != 0x4000
42*84d9c625SLionel Sambuc #error "Unsupported long double format"
43*84d9c625SLionel Sambuc #endif
44*84d9c625SLionel Sambuc
45*84d9c625SLionel Sambuc long double
frexpl(long double x,int * ex)46*84d9c625SLionel Sambuc frexpl(long double x, int *ex)
47*84d9c625SLionel Sambuc {
48*84d9c625SLionel Sambuc union ieee_ext_u u;
49*84d9c625SLionel Sambuc
50*84d9c625SLionel Sambuc u.extu_ld = x;
51*84d9c625SLionel Sambuc switch (u.extu_ext.ext_exp) {
52*84d9c625SLionel Sambuc case 0: /* 0 or subnormal */
53*84d9c625SLionel Sambuc if ((u.extu_ext.ext_fracl | u.extu_ext.ext_frach) == 0) {
54*84d9c625SLionel Sambuc *ex = 0;
55*84d9c625SLionel Sambuc } else {
56*84d9c625SLionel Sambuc u.extu_ld *= 0x1.0p514;
57*84d9c625SLionel Sambuc *ex = u.extu_ext.ext_exp - 0x4200;
58*84d9c625SLionel Sambuc u.extu_ext.ext_exp = 0x3ffe;
59*84d9c625SLionel Sambuc }
60*84d9c625SLionel Sambuc break;
61*84d9c625SLionel Sambuc case 0x7fff: /* infinity or NaN; value of *ex is unspecified */
62*84d9c625SLionel Sambuc break;
63*84d9c625SLionel Sambuc default: /* normal */
64*84d9c625SLionel Sambuc *ex = u.extu_ext.ext_exp - 0x3ffe;
65*84d9c625SLionel Sambuc u.extu_ext.ext_exp = 0x3ffe;
66*84d9c625SLionel Sambuc break;
67*84d9c625SLionel Sambuc }
68*84d9c625SLionel Sambuc return (u.extu_ld);
69*84d9c625SLionel Sambuc }
70*84d9c625SLionel Sambuc #endif
71