1 /* Round long double value to long int.
2 Copyright (C) 1997-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
23 #include <math_private.h>
24 #include <libm-alias-ldouble.h>
28 __lroundl (long double x
)
35 GET_LDOUBLE_WORDS (se
, i0
, i1
, x
);
36 j0
= (se
& 0x7fff) - 0x3fff;
37 sign
= (se
& 0x8000) != 0 ? -1 : 1;
42 return j0
< -1 ? 0 : sign
;
45 uint32_t j
= i0
+ (0x40000000 >> j0
);
53 result
= j
>> (31 - j0
);
55 if (sizeof (long int) == 4
57 && result
== LONG_MIN
)
58 /* Rounding brought the value out of range. */
59 feraiseexcept (FE_INVALID
);
63 else if (j0
< (int32_t) (8 * sizeof (long int)) - 1)
66 result
= ((long int) i0
<< (j0
- 31)) | (i1
<< (j0
- 63));
69 uint32_t j
= i1
+ (0x80000000 >> (j0
- 31));
70 unsigned long int ures
= i0
;
79 result
= (ures
<< (j0
- 31)) | (j
>> (63 - j0
));
81 if (sizeof (long int) == 8
83 && result
== LONG_MIN
)
84 /* Rounding brought the value out of range. */
85 feraiseexcept (FE_INVALID
);
92 /* The number is too large. Unless it rounds to LONG_MIN,
93 FE_INVALID must be raised and the return value is
96 if (sizeof (long int) == 4
97 && x
<= (long double) LONG_MIN
- 0.5L)
99 /* If truncation produces LONG_MIN, the cast will not raise
100 the exception, but may raise "inexact". */
101 feraiseexcept (FE_INVALID
);
108 return sign
* result
;
111 libm_alias_ldouble (__lround
, lround
)