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/* Round argument to nearest integral value according to current rounding
direction.
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. */
static long double two52[2] =
{
4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */
-4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */
};
long int
__rinttol (long double x)
{
int32_t j0,sx;
u_int32_t i0,i1,i;
long double t, w;
long int result;
EXTRACT_WORDS (i0, i1, x);
sx = i0 >> 31;
j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
if (j0 < 20)
{
if (j0 < 0)
{
if (((i0 & 0x7fffffff) | i1) == 0)
/* The number is 0. */
result = 0;
else
{
i1 |= i0;
i0 &= 0xfffe0000;
i0 |= ((i1 | -i1) >> 12) & 0x80000;
SET_HIGH_WORD (x, i0);
w = two52[sx] + x;
t = w - two52[sx];
GET_HIGH_WORD (i0, t);
if ((i0 & 0x7fffffff) >= 0x3fff0000)
result = sx ? -1 : 1;
else
result = 0;
}
}
else
{
u_int32_t i = 0x000fffff >> j0;
if (((i0 & i) | i1) == 0)
{
/* X is not integral. */
i >>= 1;
if (((i0 & i) | i1) != 0)
{
if (j0 == 19)
i1 = 0x40000000;
else
i0 = (i0 & (~i)) | (0x20000 >> j0);
INSERT_WORDS (x, i0, i1);
w = two52[sx] + x;
x = w - two52[sx];
EXTRACT_WORDS (i0, i1, x);
j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
}
}
result = ((i0 >> (20 - j0)) & 0xfffff) | (0x00100000 >> (20 - j0));
if (sx)
result = -result;
}
}
else if ((unsigned int) j0 < sizeof (long int) * 8 && j0 < 53)
{
i = ((u_int32_t) (0xffffffff)) >> (j0 - 20);
if ((i1 & i) != 0)
{
/* x is not integral. */
i >>= 1;
if ((i1 & i) != 0)
i1 = (i1 & (~i)) | (0x40000000 >> (j0 - 20));
}
INSERT_WORDS (x, i0, i1);
w = two52[sx] + x;
x = w - two52[sx];
EXTRACT_WORDS (i0, i1, x);
j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
result = i0 | 0x00100000;
if (j0 > 20)
{
result <<= j0 - 20;
result |= i1 >> (52 - j0);
}
if (sx)
result = -result;
}
else
/* Too large. The number is either +-inf or NaN or it is too
large to be effected by rounding. The standard leaves it
undefined what to return when the number is too large to fit in
a `long int'. */
result = (long int) x;
return result;
}
#else
static long double two63[2] =
{
9.223372036854775808000000e+18, /* 0x403E, 0x00000000, 0x00000000 */
-9.223372036854775808000000e+18 /* 0xC03E, 0x00000000, 0x00000000 */
};
long int
__rinttol (long double x)
{
int32_t se,j0,sx;
u_int32_t i0,i1,i;
long int result;
long double w, t;
GET_LDOUBLE_WORDS (se, i0, i1, x);
sx = (se >> 15) & 1;
j0 = (se & 0x7fff) - 0x3fff;
if (j0 < 31)
{
if (j0 < 0)
{
if (((se & 0x7fff) | i0 | i1) == 0)
/* The number is 0. */
result = 0;
else
{
i1 |= i0;
i0 &= 0xe0000000;
i0 |= (i1 | -i1) & 0x80000000;
SET_LDOUBLE_MSW (x, i0);
w = two63[sx] + x;
t = w - two63[sx];
GET_LDOUBLE_EXP (i0, t);
if ((i0 & 0x7fff) >= 0x3fff)
result = sx ? -1 : 1;
else
result = 0;
}
}
else
{
u_int32_t i = 0x7fffffff >> j0;
if (((i0 & i) | i1) == 0)
{
/* X is not integral. */
i >>= 1;
if (((i0 & i) | i1) != 0)
{
if (j0 == 31)
i1 = 0x40000000;
else
i0 = (i0 & (~i)) | (0x20000000 >> j0);
SET_LDOUBLE_WORDS (x, se, i0, i1);
w = two63[sx] + x;
x = w - two63[sx];
GET_LDOUBLE_WORDS (se, i0, i1, x);
sx = (se >> 15) & 1;
j0 = (se & 0x7fff) - 0x3fff;
}
}
result = i0 >> (31 - j0);
}
}
else if ((unsigned int) j0 < sizeof (long int) * 8 && j0 < 64)
{
i = ((u_int32_t) (0xffffffff)) >> (j0 - 31);
if ((i1 & i) != 0)
{
/* x is not integral. */
i >>= 1;
if ((i1 & i) != 0)
i1 = (i1 & (~i)) | (0x40000000 >> (j0 - 31));
}
SET_LDOUBLE_WORDS (x, se, i0, i1);
w = two63[sx] + x;
x = w - two63[sx];
GET_LDOUBLE_WORDS (se, i0, i1, x);
j0 = (se & 0x7fff) - 0x3fff;
result = i0;
if (j0 > 31)
{
result <<= j0 - 31;
result |= i1 >> (63 - j0);
}
}
else
/* Too large. The number is either +-inf or NaN or it is too
large to be effected by rounding. The standard leaves it
undefined what to return when the number is too large to fit in
a `long int'. */
result = (long int) x;
return result;
}
#endif
weak_alias (__rinttol, rinttol)
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