1/* Return the least floating-point number greater than X.
2 Copyright (C) 2016-2023 Free Software Foundation, Inc.
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
17 <https://www.gnu.org/licenses/>. */
18
19#include <float.h>
20#include <math.h>
21#include <math_private.h>
22#include <libm-alias-ldouble.h>
23
24/* Return the least floating-point number greater than X. */
25_Float128
26__nextupl (_Float128 x)
27{
28 int64_t hx, ix;
29 uint64_t lx;
30
31 GET_LDOUBLE_WORDS64 (hx, lx, x);
32 ix = hx & 0x7fffffffffffffffLL;
33
34 /* x is nan. */
35 if (((ix >= 0x7fff000000000000LL)
36 && ((ix - 0x7fff000000000000LL) | lx) != 0))
37 return x + x;
38 if ((ix | lx) == 0)
39 return LDBL_TRUE_MIN;
40 if (hx >= 0)
41 { /* x > 0. */
42 if (isinf (x))
43 return x;
44 lx++;
45 if (lx == 0)
46 hx++;
47 }
48 else
49 { /* x < 0. */
50 if (lx == 0)
51 hx--;
52 lx--;
53 }
54 SET_LDOUBLE_WORDS64 (x, hx, lx);
55 return x;
56}
57
58libm_alias_ldouble (__nextup, nextup)
59