mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-16 01:50:11 +00:00
6624dbc07b
2006-06-17 Joseph S. Myers <joseph@codesourcery.com> [BZ #2592] * math/libm-test.inc (lrint_test_tonearest): New function. (lrint_test_towardzero): New function. (lrint_test_downward): New function. (lrint_test_upward): New function. (main): Run these new tests. * sysdeps/ieee754/dbl-64/s_llrint.c (__llrint): Correct rounding of values near to 0. (two52): Use double not long double. * sysdeps/ieee754/dbl-64/s_lrint.c (__lrint): Likewise. * sysdeps/ieee754/flt-32/s_llrintf.c (__llrintf): Likewise. (two23): Use float not double. * sysdeps/ieee754/flt-32/s_lrintf.c (__lrintf): Likewise. (two23): Use float not double. * sysdeps/ieee754/ldbl-128/s_llrintl.c (__llrintl): Likewise. * sysdeps/ieee754/ldbl-128/s_lrintl.c (__lrintl): Likewise. * sysdeps/ieee754/ldbl-96/s_llrintl.c (__llrintl): Likewise. * sysdeps/ieee754/ldbl-96/s_lrintl.c (__lrintl): Likewise.
76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/* Round argument to nearest integral value according to current rounding
|
|
direction.
|
|
Copyright (C) 1997, 1999, 2006 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
|
|
Jakub Jelinek <jj@ultra.linux.cz>, 1999.
|
|
|
|
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"
|
|
|
|
static const long double two112[2] =
|
|
{
|
|
5.19229685853482762853049632922009600E+33L, /* 0x406F000000000000, 0 */
|
|
-5.19229685853482762853049632922009600E+33L /* 0xC06F000000000000, 0 */
|
|
};
|
|
|
|
long long int
|
|
__llrintl (long double x)
|
|
{
|
|
int32_t j0;
|
|
u_int64_t i0,i1;
|
|
volatile long double w;
|
|
long double t;
|
|
long long int result;
|
|
int sx;
|
|
|
|
GET_LDOUBLE_WORDS64 (i0, i1, x);
|
|
j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
|
|
sx = i0 >> 63;
|
|
i0 &= 0x0000ffffffffffffLL;
|
|
i0 |= 0x0001000000000000LL;
|
|
|
|
if (j0 < (int32_t) (8 * sizeof (long long int)) - 1)
|
|
{
|
|
w = two112[sx] + x;
|
|
t = w - two112[sx];
|
|
GET_LDOUBLE_WORDS64 (i0, i1, t);
|
|
j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
|
|
i0 &= 0x0000ffffffffffffLL;
|
|
i0 |= 0x0001000000000000LL;
|
|
|
|
if (j0 < 0)
|
|
result = 0;
|
|
else if (j0 <= 48)
|
|
result = i0 >> (48 - j0);
|
|
else
|
|
result = ((long long int) i0 << (j0 - 48)) | (i1 >> (112 - j0));
|
|
}
|
|
else
|
|
{
|
|
/* The number is too large. It is left implementation defined
|
|
what happens. */
|
|
return (long long int) x;
|
|
}
|
|
|
|
return sx ? -result : result;
|
|
}
|
|
|
|
weak_alias (__llrintl, llrintl)
|