1 /* Round double to integer away from zero.
2 Copyright (C) 1997-2024 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/>. */
19 #define NO_MATH_REDIRECT
22 #include <math_private.h>
23 #include <libm-alias-double.h>
25 #include <math-use-builtins.h>
32 return __builtin_round (x
);
34 /* Use generic implementation. */
37 EXTRACT_WORDS64 (i0
, x
);
38 j0
= ((i0
>> 52) & 0x7ff) - 0x3ff;
39 if (__glibc_likely (j0
< 52))
43 i0
&= UINT64_C (0x8000000000000000);
45 i0
|= UINT64_C (0x3ff0000000000000);
49 uint64_t i
= UINT64_C (0x000fffffffffffff) >> j0
;
54 i0
+= UINT64_C (0x0008000000000000) >> j0
;
67 INSERT_WORDS64 (x
, i0
);
69 #endif /* ! USE_ROUND_BUILTIN */
71 libm_alias_double (__round
, round
)