]>
git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/ieee754/ldbl-96/s_lrintl.c
1 /* Round argument to nearest integral value according to current rounding
3 Copyright (C) 1997-2019 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; if not, see
19 <http://www.gnu.org/licenses/>. */
25 #include <math_private.h>
26 #include <libm-alias-ldouble.h>
28 static const long double two63
[2] =
30 9.223372036854775808000000e+18, /* 0x403E, 0x00000000, 0x00000000 */
31 -9.223372036854775808000000e+18 /* 0xC03E, 0x00000000, 0x00000000 */
36 __lrintl (long double x
)
45 GET_LDOUBLE_WORDS (se
, i0
, i1
, x
);
48 j0
= (se
& 0x7fff) - 0x3fff;
52 #if defined FE_INVALID || defined FE_INEXACT
53 /* X < LONG_MAX + 1 implied by J0 < 31. */
54 if (sizeof (long int) == 4
55 && x
> (long double) LONG_MAX
)
57 /* In the event of overflow we must raise the "invalid"
58 exception, but not "inexact". */
60 feraiseexcept (t
== LONG_MAX
? FE_INEXACT
: FE_INVALID
);
68 GET_LDOUBLE_WORDS (se
, i0
, i1
, t
);
69 j0
= (se
& 0x7fff) - 0x3fff;
71 result
= (j0
< 0 ? 0 : i0
>> (31 - j0
));
73 else if (j0
< (int32_t) (8 * sizeof (long int)) - 1)
76 result
= ((long int) i0
<< (j0
- 31)) | (i1
<< (j0
- 63));
79 #if defined FE_INVALID || defined FE_INEXACT
80 /* X < LONG_MAX + 1 implied by J0 < 63. */
81 if (sizeof (long int) == 8
82 && x
> (long double) LONG_MAX
)
84 /* In the event of overflow we must raise the "invalid"
85 exception, but not "inexact". */
87 feraiseexcept (t
== LONG_MAX
? FE_INEXACT
: FE_INVALID
);
95 GET_LDOUBLE_WORDS (se
, i0
, i1
, t
);
96 j0
= (se
& 0x7fff) - 0x3fff;
99 result
= (long int) i0
;
101 result
= ((long int) i0
<< (j0
- 31)) | (i1
>> (63 - j0
));
106 /* The number is too large. Unless it rounds to LONG_MIN,
107 FE_INVALID must be raised and the return value is
109 #if defined FE_INVALID || defined FE_INEXACT
110 if (sizeof (long int) == 4
111 && x
< (long double) LONG_MIN
112 && x
> (long double) LONG_MIN
- 1.0L)
114 /* If truncation produces LONG_MIN, the cast will not raise
115 the exception, but may raise "inexact". */
116 t
= __nearbyintl (x
);
117 feraiseexcept (t
== LONG_MIN
? FE_INEXACT
: FE_INVALID
);
124 return sx
? -result
: result
;
127 libm_alias_ldouble (__lrint
, lrint
)