]>
git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/ieee754/ldbl-96/s_roundl.c
1 /* Round long double to integer away from zero.
2 Copyright (C) 1997-2015 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
22 #include <math_private.h>
25 static const long double huge
= 1.0e4930L
;
29 __roundl (long double x
)
34 GET_LDOUBLE_WORDS (se
, i0
, i1
, x
);
35 j0
= (se
& 0x7fff) - 0x3fff;
40 math_force_eval (huge
+ x
);
51 u_int32_t i
= 0x7fffffff >> j0
;
52 if (((i0
& i
) | i1
) == 0)
56 /* Raise inexact if x != 0. */
57 math_force_eval (huge
+ x
);
58 u_int32_t j
= i0
+ (0x40000000 >> j0
);
61 i0
= (j
& ~i
) | 0x80000000;
75 u_int32_t i
= 0xffffffff >> (j0
- 31);
80 math_force_eval (huge
+ x
);
81 /* Raise inexact if x != 0. */
82 u_int32_t j
= i1
+ (1 << (62 - j0
));
97 SET_LDOUBLE_WORDS (x
, se
, i0
, i1
);
100 weak_alias (__roundl
, roundl
)