diff options
Diffstat (limited to 'REORG.TODO/sysdeps/ieee754/dbl-64/s_fpclassify.c')
| -rw-r--r-- | REORG.TODO/sysdeps/ieee754/dbl-64/s_fpclassify.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/ieee754/dbl-64/s_fpclassify.c b/REORG.TODO/sysdeps/ieee754/dbl-64/s_fpclassify.c new file mode 100644 index 0000000000..3fa9117ff0 --- /dev/null +++ b/REORG.TODO/sysdeps/ieee754/dbl-64/s_fpclassify.c @@ -0,0 +1,43 @@ +/* Return classification value corresponding to argument. + Copyright (C) 1997-2017 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, see + <http://www.gnu.org/licenses/>. */ + +#include <math.h> + +#include <math_private.h> + + +int +__fpclassify (double x) +{ + u_int32_t hx, lx; + int retval = FP_NORMAL; + + EXTRACT_WORDS (hx, lx, x); + lx |= hx & 0xfffff; + hx &= 0x7ff00000; + if ((hx | lx) == 0) + retval = FP_ZERO; + else if (hx == 0) + retval = FP_SUBNORMAL; + else if (hx == 0x7ff00000) + retval = lx != 0 ? FP_NAN : FP_INFINITE; + + return retval; +} +libm_hidden_def (__fpclassify) |