mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-24 22:10:13 +00:00
688903eb3e
* 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.
60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
/* Get NaN payload. ldbl-128 version.
|
|
Copyright (C) 2016-2018 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 <libm-alias-ldouble.h>
|
|
#include <stdint.h>
|
|
|
|
_Float128
|
|
__getpayloadl (const _Float128 *x)
|
|
{
|
|
uint64_t hx, lx;
|
|
GET_LDOUBLE_WORDS64 (hx, lx, *x);
|
|
hx &= 0x7fffffffffffULL;
|
|
/* Construct the representation of the return value directly, since
|
|
128-bit integers may not be available. */
|
|
int lz;
|
|
if (hx == 0)
|
|
{
|
|
if (lx == 0)
|
|
return 0.0L;
|
|
else
|
|
lz = __builtin_clzll (lx) + 64;
|
|
}
|
|
else
|
|
lz = __builtin_clzll (hx);
|
|
int shift = lz - 15;
|
|
if (shift >= 64)
|
|
{
|
|
hx = lx << (shift - 64);
|
|
lx = 0;
|
|
}
|
|
else
|
|
{
|
|
/* 2 <= SHIFT <= 63. */
|
|
hx = (hx << shift) | (lx >> (64 - shift));
|
|
lx <<= shift;
|
|
}
|
|
hx = (hx & 0xffffffffffffULL) | ((0x3fffULL + 127 - lz) << 48);
|
|
_Float128 ret;
|
|
SET_LDOUBLE_WORDS64 (ret, hx, lx);
|
|
return ret;
|
|
}
|
|
libm_alias_ldouble (__getpayload, getpayload)
|