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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"
static const double two23[2] =
{
8.3886080000e+06, /* 0x4B000000 */
-8.3886080000e+06, /* 0xCB000000 */
};
long int
__lrintf (float x)
{
int32_t j0;
u_int32_t i, i0;
volatile float w;
float t;
long int result;
int sx;
GET_FLOAT_WORD (i, x);
sx = i0 >> 31;
j0 = ((i0 >> 23) & 0xff) - 0x7f;
i0 = i & 0x7fffff;
i0 |= 0x800000;
if (j0 < (int32_t) (sizeof (long int) * 8) - 1)
{
if (j0 < -1)
return 0;
else if (j0 >= 23)
result = (long int) i0 << (j0 - 23);
else
{
w = two23[sx] + x;
t = w - two23[sx];
GET_FLOAT_WORD (i, t);
i0 = i & 0x7fffff;
i0 |= 0x800000;
j0 = ((i0 >> 23) & 0xff) - 0x7f;
result = i0 >> (23 - j0);
}
}
else
{
/* The number is too large. It is left implementation defined
what happens. */
return (long int) x;
}
return sx ? -result : result;
}
weak_alias (__lrintf, lrintf)
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