blob: 9624631292af1138375e03117c0af79bf87559ff [file] [log] [blame]
/* Copyright (C) 2000, 2006, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Richard Henderson.
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_ldbl_opt.h>
double
__rint (double x)
{
if (isless (fabs (x), 9007199254740992.0)) /* 1 << DBL_MANT_DIG */
{
double tmp1, new_x;
__asm (
#ifdef _IEEE_FP_INEXACT
"cvttq/svid %2,%1\n\t"
#else
"cvttq/svd %2,%1\n\t"
#endif
"cvtqt/d %1,%0\n\t"
: "=f"(new_x), "=&f"(tmp1)
: "f"(x));
/* rint(-0.1) == -0, and in general we'll always have the same
sign as our input. */
x = copysign(new_x, x);
}
return x;
}
weak_alias (__rint, rint)
#ifdef NO_LONG_DOUBLE
strong_alias (__rint, __rintl)
weak_alias (__rint, rintl)
#endif
#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
compat_symbol (libm, __rint, rintl, GLIBC_2_0);
#endif