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Diffstat (limited to 'math/s_fdim.c')
| -rw-r--r-- | math/s_fdim.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/math/s_fdim.c b/math/s_fdim.c new file mode 100644 index 0000000..5804e63 --- /dev/null +++ b/math/s_fdim.c @@ -0,0 +1,40 @@ +/* Return positive difference between arguments. + Copyright (C) 1997, 2004 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. + + 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <math.h> + +double +__fdim (double x, double y) +{ + int clsx = fpclassify (x); + int clsy = fpclassify (y); + + if (clsx == FP_NAN || clsy == FP_NAN + || (y < 0 && clsx == FP_INFINITE && clsy == FP_INFINITE)) + /* Raise invalid flag. */ + return x - y; + + return x <= y ? 0 : x - y; +} +weak_alias (__fdim, fdim) +#ifdef NO_LONG_DOUBLE +strong_alias (__fdim, __fdiml) +weak_alias (__fdim, fdiml) +#endif |