mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-26 04:31:03 +00:00
71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/* Set NaN payload. ldbl-128 version.
|
|
Copyright (C) 2016-2023 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 <math.h>
|
|
#include <math_private.h>
|
|
#include <libm-alias-ldouble.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 0x3fff
|
|
#define PAYLOAD_DIG 111
|
|
#define EXPLICIT_MANT_DIG 112
|
|
|
|
int
|
|
FUNC (_Float128 *x, _Float128 payload)
|
|
{
|
|
uint64_t hx, lx;
|
|
GET_LDOUBLE_WORDS64 (hx, lx, payload);
|
|
int exponent = hx >> (EXPLICIT_MANT_DIG - 64);
|
|
/* Test if argument is (a) negative or too large; (b) too small,
|
|
except for 0 when allowed; (c) not an integer. */
|
|
if (exponent >= BIAS + PAYLOAD_DIG
|
|
|| (exponent < BIAS && !(SET_HIGH_BIT && hx == 0 && lx == 0)))
|
|
{
|
|
SET_LDOUBLE_WORDS64 (*x, 0, 0);
|
|
return 1;
|
|
}
|
|
int shift = BIAS + EXPLICIT_MANT_DIG - exponent;
|
|
if (shift < 64
|
|
? (lx & ((1ULL << shift) - 1)) != 0
|
|
: (lx != 0 || (hx & ((1ULL << (shift - 64)) - 1)) != 0))
|
|
{
|
|
SET_LDOUBLE_WORDS64 (*x, 0, 0);
|
|
return 1;
|
|
}
|
|
if (exponent != 0)
|
|
{
|
|
hx &= (1ULL << (EXPLICIT_MANT_DIG - 64)) - 1;
|
|
hx |= 1ULL << (EXPLICIT_MANT_DIG - 64);
|
|
if (shift >= 64)
|
|
{
|
|
lx = hx >> (shift - 64);
|
|
hx = 0;
|
|
}
|
|
else if (shift != 0)
|
|
{
|
|
lx = (lx >> shift) | (hx << (64 - shift));
|
|
hx >>= shift;
|
|
}
|
|
}
|
|
hx |= 0x7fff000000000000ULL | (SET_HIGH_BIT ? 0x800000000000ULL : 0);
|
|
SET_LDOUBLE_WORDS64 (*x, hx, lx);
|
|
return 0;
|
|
}
|