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41a359e2 | 1 | /* Return the least floating-point number greater than X. |
6d7e8eda | 2 | Copyright (C) 2016-2023 Free Software Foundation, Inc. |
41a359e2 RS |
3 | This file is part of the GNU C Library. |
4 | ||
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. | |
9 | ||
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. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
41a359e2 | 18 | |
8f5b00d3 | 19 | #include <float.h> |
41a359e2 RS |
20 | #include <math.h> |
21 | #include <math_private.h> | |
1e2bffd0 | 22 | #include <libm-alias-double.h> |
41a359e2 RS |
23 | |
24 | /* Return the least floating-point number greater than X. */ | |
25 | double | |
26 | __nextup (double x) | |
27 | { | |
28 | int32_t hx, ix; | |
24ab7723 | 29 | uint32_t lx; |
41a359e2 RS |
30 | |
31 | EXTRACT_WORDS (hx, lx, x); | |
32 | ix = hx & 0x7fffffff; | |
33 | ||
34 | if (((ix >= 0x7ff00000) && ((ix - 0x7ff00000) | lx) != 0)) /* x is nan. */ | |
35 | return x + x; | |
36 | if ((ix | lx) == 0) | |
37 | return DBL_TRUE_MIN; | |
38 | if (hx >= 0) | |
39 | { /* x > 0. */ | |
40 | if (isinf (x)) | |
41 | return x; | |
42 | lx += 1; | |
43 | if (lx == 0) | |
44 | hx += 1; | |
45 | } | |
46 | else | |
47 | { /* x < 0. */ | |
48 | if (lx == 0) | |
49 | hx -= 1; | |
50 | lx -= 1; | |
51 | } | |
52 | INSERT_WORDS (x, hx, lx); | |
53 | return x; | |
54 | } | |
55 | ||
1e2bffd0 | 56 | libm_alias_double (__nextup, nextup) |