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/* Round long double value to long long int.
Copyright (C) 1997-2017 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>
long long int
__llroundl (long double x)
{
int32_t j0;
u_int32_t se, i1, i0;
long 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 long int)) - 1)
{
if (j0 >= 63)
result = (((long long int) i0 << 32) | i1) << (j0 - 63);
else
{
u_int32_t j = i1 + (0x80000000 >> (j0 - 31));
result = (long long int) i0;
if (j < i1)
++result;
if (j0 > 31)
{
result = (result << (j0 - 31)) | (j >> (63 - j0));
#ifdef FE_INVALID
if (sign == 1 && result == LLONG_MIN)
/* Rounding brought the value out of range. */
feraiseexcept (FE_INVALID);
#endif
}
}
}
else
{
/* The number is too large. It is left implementation defined
what happens. */
return (long long int) x;
}
return sign * result;
}
weak_alias (__llroundl, llroundl)
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