1 /* Round argument to nearest integral value according to current rounding
3 Copyright (C) 1997-2024 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
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 <https://www.gnu.org/licenses/>. */
24 #include <math_private.h>
25 #include <libm-alias-ldouble.h>
27 static const long double two63
[2] =
29 9.223372036854775808000000e+18, /* 0x403E, 0x00000000, 0x00000000 */
30 -9.223372036854775808000000e+18 /* 0xC03E, 0x00000000, 0x00000000 */
35 __llrintl (long double x
)
44 GET_LDOUBLE_WORDS (se
, i0
, i1
, x
);
47 j0
= (se
& 0x7fff) - 0x3fff;
49 if (j0
< (int32_t) (8 * sizeof (long long int)) - 1)
52 result
= (((long long int) i0
<< 32) | i1
) << (j0
- 63);
55 #if defined FE_INVALID || defined FE_INEXACT
56 /* X < LLONG_MAX + 1 implied by J0 < 63. */
57 if (x
> (long double) LLONG_MAX
)
59 /* In the event of overflow we must raise the "invalid"
60 exception, but not "inexact". */
62 feraiseexcept (t
== LLONG_MAX
? FE_INEXACT
: FE_INVALID
);
70 GET_LDOUBLE_WORDS (se
, i0
, i1
, t
);
71 j0
= (se
& 0x7fff) - 0x3fff;
76 result
= i0
>> (31 - j0
);
78 result
= ((long long int) i0
<< (j0
- 31)) | (i1
>> (63 - j0
));
83 /* The number is too large. It is left implementation defined
85 return (long long int) x
;
88 return sx
? -result
: result
;
91 libm_alias_ldouble (__llrint
, llrint
)