mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-14 17:11:06 +00:00
3eb614154c
* math/libm-test.inc (lround_test): Add new test. (llround_test): Likewise. (lrint_test): Likewise. (llrint_test): Likewise. * sysdeps/ieee754/dbl-64/s_lround.c (__lround): Fix special case with result taking up 20 bits. * sysdeps/ieee754/dbl-64/s_lrint.c (__lrint): Likewise. * sysdeps/ieee754/dbl-64/s_llrint.c (__llrint): Likewise.. * sysdeps/ieee754/ldbl-96/s_lroundl.c (__lroundl): Fix special case with result taking up 31 bits. * sysdeps/ieee754/ldbl-96/s_lrintl.c (__lrintl): Likewise.
82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
/* Round long double value to long int.
|
|
Copyright (C) 1997, 2004 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
|
|
|
|
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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <math.h>
|
|
|
|
#include "math_private.h"
|
|
|
|
|
|
long int
|
|
__lroundl (long double x)
|
|
{
|
|
int32_t j0;
|
|
u_int32_t se, i1, i0;
|
|
long int result;
|
|
int sign;
|
|
|
|
GET_LDOUBLE_WORDS (se, i0, i1, x);
|
|
j0 = (se & 0x7fff) - 0x3fff;
|
|
sign = (se & 0x8000) != 0 ? -1 : 1;
|
|
|
|
if (j0 < 31)
|
|
{
|
|
if (j0 < 0)
|
|
return j0 < -1 ? 0 : sign;
|
|
else
|
|
{
|
|
u_int32_t j = i0 + (0x40000000 >> j0);
|
|
if (j < i0)
|
|
{
|
|
j >>= 1;
|
|
j |= 0x80000000;
|
|
++j0;
|
|
}
|
|
|
|
result = j >> (31 - j0);
|
|
}
|
|
}
|
|
else if (j0 < (int32_t) (8 * sizeof (long int)) - 1)
|
|
{
|
|
if (j0 >= 63)
|
|
result = ((long int) i0 << (j0 - 31)) | (i1 << (j0 - 63));
|
|
else
|
|
{
|
|
u_int32_t j = i1 + (0x80000000 >> (j0 - 31));
|
|
if (j < i1)
|
|
++i0;
|
|
|
|
if (j0 == 31)
|
|
result = (long int) i0;
|
|
else
|
|
result = ((long int) i0 << (j0 - 31)) | (j >> (63 - j0));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* The number is too large. It is left implementation defined
|
|
what happens. */
|
|
return (long int) x;
|
|
}
|
|
|
|
return sign * result;
|
|
}
|
|
|
|
weak_alias (__lroundl, lroundl)
|