diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64/s_nextup.c')
-rw-r--r-- | sysdeps/ieee754/dbl-64/s_nextup.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_nextup.c b/sysdeps/ieee754/dbl-64/s_nextup.c new file mode 100644 index 0000000..d2432b5 --- /dev/null +++ b/sysdeps/ieee754/dbl-64/s_nextup.c @@ -0,0 +1,58 @@ +/* Return the least floating-point number greater than X. + Copyright (C) 2016 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> + +/* Return the least floating-point number greater than X. */ +double +__nextup (double x) +{ + int32_t hx, ix; + u_int32_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; +} + +weak_alias (__nextup, nextup) +#ifdef NO_LONG_DOUBLE +strong_alias (__nextup, __nextupl) +weak_alias (__nextup, nextupl) +#endif |