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/* Round long double value to long int.
Copyright (C) 1997 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. 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"
#ifdef NO_LONG_DOUBLE
/* The `long double' is in fact the IEEE `double' type. */
/* This code does not presently work. */
long int
__lround (long double x)
{
int32_t j0;
u_int32_t i1, i0;
long int result;
int sign;
EXTRACT_WORDS (i0, i1, x);
j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
sign = (i0 & 0x80000000) != 0 ? -1 : 1;
i0 &= 0xfffff;
if (j0 < 20)
{
if (j0 < 0)
result = j0 < -1 ? 0 : sign;
else
{
u_int32_t i = 0xfffff >> j0;
i0 |= 0x100000;
if (((i0 & i) | i1) == 0)
result = i0 >> j0;
else
/* X is not integral. */
result = (i0 + (0x80000 >> j0)) >> (20 - j0);
}
}
else if (j0 >= 8 * sizeof (long int) || j0 > 51)
{
/* The number is too large. It is left implementation defined
what happens. */
return (long int) x;
}
else
{
u_int32_t i = ((u_int32_t) (0xffffffff)) >> (j0 - 20);
if ((i1 & i) != 0)
{
/* x is not integral. */
u_int32_t j = i1 + (0x80000000 >> (j0 - 20));
if (j < i1)
{
j = i0 + 1;
if ((j & 0xfffff) == 0)
{
if (sizeof (long int) <= 4)
/* Overflow. */
result = (long int) x;
else
result = 1l << (j0 + 1);
}
else
result = (long int) ((i0 & 0xfffff) | 0x100000) << (j0 - 31);
}
else
{
result = (long int) ((i0 & 0xfffff) | 0x100000) << (j0 - 31);
if (sizeof (long int) > 4 && j0 > 31)
result |= j >> (63 - j0);
}
}
else
{
result = (long int) ((i0 & 0xfffff) | 0x100000) << (j0 - 31);
if (sizeof (long int) > 4 && j0 > 31)
result |= i1 >> (63 - j0);
}
}
return sign * result;
}
#else
long int
__lround (long double x)
{
int32_t j0;
u_int32_t se, i1, i0;
long int result;
GET_LDOUBLE_WORDS (se, i0, i1, x);
j0 = (se & 0x7fff) - 0x3fff;
if (j0 < 31)
{
if (j0 < 0)
result = j0 < -1 ? 0 : 1;
else
{
u_int32_t i = 0x7fffffff >> j0;
if (((i0 & i) | i1) == 0)
result = (long int) i0 >> j0;
else
{
/* X is not integral. */
u_int32_t j = i0 + (0x40000000 >> j0);
if (j < i0)
result = 0x80000000l >> (30 - j0);
else
result = j >> (31 - j0);
}
}
}
else if ((unsigned int) j0 >= 8 * sizeof (long int) || j0 > 62)
{
/* The number is too large. It is left implementation defined
what happens. */
result = (long int) x;
}
else
{
u_int32_t i = ((u_int32_t) (0xffffffff)) >> (j0 - 31);
if ((i1 & i) != 0)
{
/* x is not integral. */
u_int32_t j = i1 + (0x80000000 >> (j0 - 31));
if (j < i1)
{
j = i0 + 1;
if (j == 0)
{
if (sizeof (long int) <= 4)
/* Overflow. */
result = (long int) x;
else
result = 1l << (j0 + 1);
}
else
result = (long int) i0 << (j0 - 31);
}
else
{
result = (long int) i0 << (j0 - 31);
if (sizeof (long int) > 4 && j0 > 31)
result |= j >> (63 - j0);
}
}
else
{
result = (long int) i0 << (j0 - 31);
if (sizeof (long int) > 4 && j0 > 31)
result |= i1 >> (63 - j0);
}
}
return se & 0x8000 ? -result : result;
}
#endif
weak_alias (__lround, lround)
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