mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-16 10:00:12 +00:00
04277e02d7
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
61 lines
2.0 KiB
C
61 lines
2.0 KiB
C
/* Set NaN payload. ldbl-128ibm version.
|
|
Copyright (C) 2016-2019 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>
|
|
#include <nan-high-order-bit.h>
|
|
#include <stdint.h>
|
|
|
|
#define SET_HIGH_BIT (HIGH_ORDER_BIT_IS_SET_FOR_SNAN ? SIG : !SIG)
|
|
#define BIAS 0x3ff
|
|
#define PAYLOAD_DIG 51
|
|
#define EXPLICIT_MANT_DIG 52
|
|
|
|
int
|
|
FUNC (long double *x, long double payload)
|
|
{
|
|
double hi, lo;
|
|
uint64_t hx, lx;
|
|
|
|
ldbl_unpack (payload, &hi, &lo);
|
|
EXTRACT_WORDS64 (hx, hi);
|
|
EXTRACT_WORDS64 (lx, lo);
|
|
int exponent = hx >> EXPLICIT_MANT_DIG;
|
|
/* Test if argument is (a) negative or too large; (b) too small,
|
|
except for 0 when allowed; (c) not an integer. All valid
|
|
arguments have the low part zero. */
|
|
if ((lx & 0x7fffffffffffffffULL) != 0
|
|
|| exponent >= BIAS + PAYLOAD_DIG
|
|
|| (exponent < BIAS && !(SET_HIGH_BIT && hx == 0))
|
|
|| (hx & ((1ULL << (BIAS + EXPLICIT_MANT_DIG - exponent)) - 1)) != 0)
|
|
{
|
|
*x = 0.0L;
|
|
return 1;
|
|
}
|
|
if (hx != 0)
|
|
{
|
|
hx &= (1ULL << EXPLICIT_MANT_DIG) - 1;
|
|
hx |= 1ULL << EXPLICIT_MANT_DIG;
|
|
hx >>= BIAS + EXPLICIT_MANT_DIG - exponent;
|
|
}
|
|
hx |= 0x7ff0000000000000ULL | (SET_HIGH_BIT ? 0x8000000000000ULL : 0);
|
|
INSERT_WORDS64 (hi, hx);
|
|
*x = ldbl_pack (hi, 0.0);
|
|
return 0;
|
|
}
|