1 |
|
|
/* $OpenBSD: s_frexpl.c,v 1.2 2016/09/12 19:47:02 guenther Exp $ */ |
2 |
|
|
/*- |
3 |
|
|
* Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG> |
4 |
|
|
* All rights reserved. |
5 |
|
|
* |
6 |
|
|
* Redistribution and use in source and binary forms, with or without |
7 |
|
|
* modification, are permitted provided that the following conditions |
8 |
|
|
* are met: |
9 |
|
|
* 1. Redistributions of source code must retain the above copyright |
10 |
|
|
* notice, this list of conditions and the following disclaimer. |
11 |
|
|
* 2. Redistributions in binary form must reproduce the above copyright |
12 |
|
|
* notice, this list of conditions and the following disclaimer in the |
13 |
|
|
* documentation and/or other materials provided with the distribution. |
14 |
|
|
* |
15 |
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
16 |
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
17 |
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
18 |
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
19 |
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
20 |
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
21 |
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
22 |
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
23 |
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
24 |
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
25 |
|
|
* SUCH DAMAGE. |
26 |
|
|
* |
27 |
|
|
* $FreeBSD: src/lib/msun/src/s_frexpl.c,v 1.1 2005/03/07 04:54:51 das Exp $ |
28 |
|
|
*/ |
29 |
|
|
|
30 |
|
|
#include <sys/types.h> |
31 |
|
|
#include <machine/ieee.h> |
32 |
|
|
#include <float.h> |
33 |
|
|
#include <math.h> |
34 |
|
|
|
35 |
|
|
#if LDBL_MAX_EXP != 0x4000 |
36 |
|
|
#error "Unsupported long double format" |
37 |
|
|
#endif |
38 |
|
|
|
39 |
|
|
long double |
40 |
|
|
frexpl(long double x, int *ex) |
41 |
|
|
{ |
42 |
|
|
struct ieee_ext *p = (struct ieee_ext *)&x; |
43 |
|
|
|
44 |
✗✓✓ |
2274 |
switch (p->ext_exp) { |
45 |
|
|
case 0: /* 0 or subnormal */ |
46 |
|
|
if ((p->ext_fracl |
47 |
|
|
#ifdef EXT_FRACLMBITS |
48 |
|
|
| p->ext_fraclm |
49 |
|
|
#endif /* EXT_FRACLMBITS */ |
50 |
|
|
#ifdef EXT_FRACHMBITS |
51 |
|
|
| p->ext_frachm |
52 |
|
|
#endif /* EXT_FRACHMBITS */ |
53 |
|
|
| p->ext_frach) == 0) { |
54 |
|
|
*ex = 0; |
55 |
|
|
} else { |
56 |
|
|
x *= 0x1.0p514; |
57 |
|
|
*ex = p->ext_exp - 0x4200; |
58 |
|
|
p->ext_exp = 0x3ffe; |
59 |
|
|
} |
60 |
|
|
break; |
61 |
|
|
case 0x7fff: /* infinity or NaN; value of *ex is unspecified */ |
62 |
|
|
break; |
63 |
|
|
default: /* normal */ |
64 |
|
1137 |
*ex = p->ext_exp - 0x3ffe; |
65 |
|
1137 |
p->ext_exp = 0x3ffe; |
66 |
|
1137 |
break; |
67 |
|
|
} |
68 |
|
|
|
69 |
|
1137 |
return x; |
70 |
|
|
} |
71 |
|
|
DEF_STD(frexpl); |