mirror of git://sourceware.org/git/glibc.git
59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
|
/* Round to integer type (C23 version). ldbl-96 version.
|
||
|
|
Copyright (C) 2016-2025 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 <errno.h>
|
||
|
|
#include <fenv.h>
|
||
|
|
#include <math.h>
|
||
|
|
#include <math_private.h>
|
||
|
|
#include <libm-alias-ldouble.h>
|
||
|
|
#include <stdbool.h>
|
||
|
|
#include <stdint.h>
|
||
|
|
#include <shlib-compat.h>
|
||
|
|
|
||
|
|
#define FLOAT long double
|
||
|
|
#define PREFIX LDBL_
|
||
|
|
#define SUFFIX l
|
||
|
|
#define BIAS 0x3fff
|
||
|
|
#define MANT_DIG 64
|
||
|
|
|
||
|
|
#include <fromfp.h>
|
||
|
|
|
||
|
|
long double
|
||
|
|
FUNC (long double x, int round, unsigned int width)
|
||
|
|
{
|
||
|
|
width = fromfp_adjust_width (width);
|
||
|
|
long double rx = fromfp_round (x, round);
|
||
|
|
if (width == 0 || !isfinite (rx))
|
||
|
|
return fromfp_domain_error ();
|
||
|
|
uint16_t se;
|
||
|
|
uint32_t hx, lx;
|
||
|
|
GET_LDOUBLE_WORDS (se, hx, lx, rx);
|
||
|
|
bool negative = (se & 0x8000) != 0;
|
||
|
|
int exponent = se & 0x7fff;
|
||
|
|
exponent -= BIAS;
|
||
|
|
int max_exponent = fromfp_max_exponent (negative, width);
|
||
|
|
uint64_t ix = (((uint64_t) hx) << 32) | lx;
|
||
|
|
if (exponent > max_exponent
|
||
|
|
|| (!UNSIGNED
|
||
|
|
&& negative
|
||
|
|
&& exponent == max_exponent
|
||
|
|
&& ix != 0x8000000000000000ULL))
|
||
|
|
return fromfp_domain_error ();
|
||
|
|
return fromfp_return (x, rx);
|
||
|
|
}
|