mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-16 01:50:11 +00:00
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
/* Round a 64-bit floating point value to the nearest integer.
|
|
Copyright (C) 1997-2017 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>
|
|
|
|
double
|
|
__rint (double x)
|
|
{
|
|
static const float TWO52 = 4503599627370496.0;
|
|
|
|
if (fabs (x) < TWO52)
|
|
{
|
|
if (x > 0.0)
|
|
{
|
|
x += TWO52;
|
|
x -= TWO52;
|
|
}
|
|
else if (x < 0.0)
|
|
{
|
|
x = TWO52 - x;
|
|
x = -(x - TWO52);
|
|
}
|
|
}
|
|
|
|
return x;
|
|
}
|
|
weak_alias (__rint, rint)
|
|
#ifdef NO_LONG_DOUBLE
|
|
strong_alias (__rint, __rintl)
|
|
weak_alias (__rint, rintl)
|
|
#endif
|