mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-15 01:21:06 +00:00
45 lines
1.6 KiB
C
45 lines
1.6 KiB
C
/* Test whether long double value is canonical. ldbl-96 version.
|
|
Copyright (C) 2016-2020 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <float.h>
|
|
#include <math.h>
|
|
#include <math_private.h>
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
|
|
int
|
|
__iscanonicall (long double x)
|
|
{
|
|
uint32_t se, i0, i1 __attribute__ ((unused));
|
|
|
|
GET_LDOUBLE_WORDS (se, i0, i1, x);
|
|
int32_t ix = se & 0x7fff;
|
|
bool mant_high = (i0 & 0x80000000) != 0;
|
|
|
|
if (LDBL_MIN_EXP == -16381)
|
|
/* Intel variant: the high mantissa bit should have a value
|
|
determined by the exponent. */
|
|
return ix > 0 ? mant_high : !mant_high;
|
|
else
|
|
/* M68K variant: both values of the high bit are valid for the
|
|
greatest and smallest exponents, while other exponents require
|
|
the high bit to be set. */
|
|
return ix == 0 || ix == 0x7fff || mant_high;
|
|
}
|
|
libm_hidden_def (__iscanonicall)
|