| /* Return the least floating-point number greater than X. |
| Copyright (C) 2016-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <math.h> |
| #include <math_private.h> |
| #include <libm-alias-double.h> |
| |
| /* Return the least floating-point number greater than X. */ |
| double |
| __nextup (double x) |
| { |
| int32_t hx, ix; |
| uint32_t lx; |
| |
| EXTRACT_WORDS (hx, lx, x); |
| ix = hx & 0x7fffffff; |
| |
| if (((ix >= 0x7ff00000) && ((ix - 0x7ff00000) | lx) != 0)) /* x is nan. */ |
| return x + x; |
| if ((ix | lx) == 0) |
| return DBL_TRUE_MIN; |
| if (hx >= 0) |
| { /* x > 0. */ |
| if (isinf (x)) |
| return x; |
| lx += 1; |
| if (lx == 0) |
| hx += 1; |
| } |
| else |
| { /* x < 0. */ |
| if (lx == 0) |
| hx -= 1; |
| lx -= 1; |
| } |
| INSERT_WORDS (x, hx, lx); |
| return x; |
| } |
| |
| libm_alias_double (__nextup, nextup) |
