1 /* Round float value to long long int.
2 Copyright (C) 1997-2021 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-float.h>
25 #include <fix-fp-int-convert-overflow.h>
36 GET_FLOAT_WORD (i
, x
);
37 j0
= ((i
>> 23) & 0xff) - 0x7f;
38 sign
= (i
& 0x80000000) != 0 ? -1 : 1;
42 if (j0
< (int32_t) (8 * sizeof (long long int)) - 1)
45 return j0
< -1 ? 0 : sign
;
47 result
= (long long int) i
<< (j0
- 23);
52 result
= i
>> (23 - j0
);
58 /* The number is too large. Unless it rounds to LLONG_MIN,
59 FE_INVALID must be raised and the return value is
61 if (FIX_FLT_LLONG_CONVERT_OVERFLOW
&& x
!= (float) LLONG_MIN
)
63 feraiseexcept (FE_INVALID
);
64 return sign
== 1 ? LLONG_MAX
: LLONG_MIN
;
67 return (long long int) x
;
73 libm_alias_float (__llround
, llround
)