mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-24 22:10:13 +00:00
98 lines
3.1 KiB
C
98 lines
3.1 KiB
C
/* Return classification value corresponding to argument.
|
|
Copyright (C) 1997-2015 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
|
|
Jakub Jelinek <jj@ultra.linux.cz>, 1999.
|
|
|
|
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 <math_ldbl_opt.h>
|
|
|
|
/*
|
|
* hx lx
|
|
* +NaN 7ffn nnnn nnnn nnnn xxxx xxxx xxxx xxxx
|
|
* -NaN fffn nnnn nnnn nnnn xxxx xxxx xxxx xxxx
|
|
* +Inf 7ff0 0000 0000 0000 xxxx xxxx xxxx xxxx
|
|
* -Inf fff0 0000 0000 0000 xxxx xxxx xxxx xxxx
|
|
* +0 0000 0000 0000 0000 xxxx xxxx xxxx xxxx
|
|
* -0 8000 0000 0000 0000 xxxx xxxx xxxx xxxx
|
|
* +normal 0360 0000 0000 0000 0000 0000 0000 0000 (smallest)
|
|
* -normal 8360 0000 0000 0000 0000 0000 0000 0000 (smallest)
|
|
* +normal 7fef ffff ffff ffff 7c8f ffff ffff fffe (largest)
|
|
* +normal ffef ffff ffff ffff fc8f ffff ffff fffe (largest)
|
|
* +denorm 0360 0000 0000 0000 8000 0000 0000 0001 (largest)
|
|
* -denorm 8360 0000 0000 0000 0000 0000 0000 0001 (largest)
|
|
* +denorm 000n nnnn nnnn nnnn xxxx xxxx xxxx xxxx
|
|
* -denorm 800n nnnn nnnn nnnn xxxx xxxx xxxx xxxx
|
|
*/
|
|
|
|
int
|
|
___fpclassifyl (long double x)
|
|
{
|
|
u_int64_t hx, lx;
|
|
int retval = FP_NORMAL;
|
|
double xhi, xlo;
|
|
|
|
ldbl_unpack (x, &xhi, &xlo);
|
|
EXTRACT_WORDS64 (hx, xhi);
|
|
if ((hx & 0x7ff0000000000000ULL) == 0x7ff0000000000000ULL) {
|
|
/* +/-NaN or +/-Inf */
|
|
if (hx & 0x000fffffffffffffULL) {
|
|
/* +/-NaN */
|
|
retval = FP_NAN;
|
|
} else {
|
|
retval = FP_INFINITE;
|
|
}
|
|
} else {
|
|
/* +/-zero or +/- normal or +/- denormal */
|
|
if (hx & 0x7fffffffffffffffULL) {
|
|
/* +/- normal or +/- denormal */
|
|
if ((hx & 0x7ff0000000000000ULL) > 0x0360000000000000ULL) {
|
|
/* +/- normal */
|
|
retval = FP_NORMAL;
|
|
} else {
|
|
if ((hx & 0x7ff0000000000000ULL) == 0x0360000000000000ULL) {
|
|
EXTRACT_WORDS64 (lx, xlo);
|
|
if ((lx & 0x7fffffffffffffff) /* lower is non-zero */
|
|
&& ((lx^hx) & 0x8000000000000000ULL)) { /* and sign differs */
|
|
/* +/- denormal */
|
|
retval = FP_SUBNORMAL;
|
|
} else {
|
|
/* +/- normal */
|
|
retval = FP_NORMAL;
|
|
}
|
|
} else {
|
|
/* +/- denormal */
|
|
retval = FP_SUBNORMAL;
|
|
}
|
|
}
|
|
} else {
|
|
/* +/- zero */
|
|
retval = FP_ZERO;
|
|
}
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
long_double_symbol (libm, ___fpclassifyl, __fpclassifyl);
|
|
#ifdef __LONG_DOUBLE_MATH_OPTIONAL
|
|
libm_hidden_ver (___fpclassifyl, __fpclassifyl)
|
|
#else
|
|
libm_hidden_def (__fpclassifyl)
|
|
#endif
|