mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-13 23:00:22 +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.
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/* Round float value to long long int.
|
|
Copyright (C) 1997-2018 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, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <fenv.h>
|
|
#include <limits.h>
|
|
#include <math.h>
|
|
|
|
#include <math_private.h>
|
|
#include <libm-alias-float.h>
|
|
#include <fix-fp-int-convert-overflow.h>
|
|
|
|
|
|
long long int
|
|
__llroundf (float x)
|
|
{
|
|
int32_t j0;
|
|
uint32_t i;
|
|
long long int result;
|
|
int sign;
|
|
|
|
GET_FLOAT_WORD (i, x);
|
|
j0 = ((i >> 23) & 0xff) - 0x7f;
|
|
sign = (i & 0x80000000) != 0 ? -1 : 1;
|
|
i &= 0x7fffff;
|
|
i |= 0x800000;
|
|
|
|
if (j0 < (int32_t) (8 * sizeof (long long int)) - 1)
|
|
{
|
|
if (j0 < 0)
|
|
return j0 < -1 ? 0 : sign;
|
|
else if (j0 >= 23)
|
|
result = (long long int) i << (j0 - 23);
|
|
else
|
|
{
|
|
i += 0x400000 >> j0;
|
|
|
|
result = i >> (23 - j0);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
#ifdef FE_INVALID
|
|
/* The number is too large. Unless it rounds to LLONG_MIN,
|
|
FE_INVALID must be raised and the return value is
|
|
unspecified. */
|
|
if (FIX_FLT_LLONG_CONVERT_OVERFLOW && x != (float) LLONG_MIN)
|
|
{
|
|
feraiseexcept (FE_INVALID);
|
|
return sign == 1 ? LLONG_MAX : LLONG_MIN;
|
|
}
|
|
#endif
|
|
return (long long int) x;
|
|
}
|
|
|
|
return sign * result;
|
|
}
|
|
|
|
libm_alias_float (__llround, llround)
|