1/* Return the least floating-point number greater than X.
2 Copyright (C) 2016-2018 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 <http://www.gnu.org/licenses/>. */
18
19#include <math.h>
20#include <math_private.h>
21#include <libm-alias-ldouble.h>
22
23/* Return the least floating-point number greater than X. */
24_Float128
25__nextupl (_Float128 x)
26{
27 int64_t hx, ix;
28 uint64_t lx;
29
30 GET_LDOUBLE_WORDS64 (hx, lx, x);
31 ix = hx & 0x7fffffffffffffffLL;
32
33 /* x is nan. */
34 if (((ix >= 0x7fff000000000000LL)
35 && ((ix - 0x7fff000000000000LL) | lx) != 0))
36 return x + x;
37 if ((ix | lx) == 0)
38 return LDBL_TRUE_MIN;
39 if (hx >= 0)
40 { /* x > 0. */
41 if (isinf (x))
42 return x;
43 lx++;
44 if (lx == 0)
45 hx++;
46 }
47 else
48 { /* x < 0. */
49 if (lx == 0)
50 hx--;
51 lx--;
52 }
53 SET_LDOUBLE_WORDS64 (x, hx, lx);
54 return x;
55}
56
57libm_alias_ldouble (__nextup, nextup)
58