mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-11 07:40:05 +00:00
76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
/* Round argument to nearest integral value according to current rounding
|
|
direction.
|
|
Copyright (C) 1997, 2006 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 <math.h>
|
|
|
|
#include <math_private.h>
|
|
|
|
static const float two23[2] =
|
|
{
|
|
8.3886080000e+06, /* 0x4B000000 */
|
|
-8.3886080000e+06, /* 0xCB000000 */
|
|
};
|
|
|
|
|
|
long long int
|
|
__llrintf (float x)
|
|
{
|
|
int32_t j0;
|
|
u_int32_t i0;
|
|
volatile float w;
|
|
float t;
|
|
long long int result;
|
|
int sx;
|
|
|
|
GET_FLOAT_WORD (i0, x);
|
|
|
|
sx = i0 >> 31;
|
|
j0 = ((i0 >> 23) & 0xff) - 0x7f;
|
|
i0 &= 0x7fffff;
|
|
i0 |= 0x800000;
|
|
|
|
if (j0 < (int32_t) (sizeof (long long int) * 8) - 1)
|
|
{
|
|
if (j0 >= 23)
|
|
result = (long long int) i0 << (j0 - 23);
|
|
else
|
|
{
|
|
w = two23[sx] + x;
|
|
t = w - two23[sx];
|
|
GET_FLOAT_WORD (i0, t);
|
|
j0 = ((i0 >> 23) & 0xff) - 0x7f;
|
|
i0 &= 0x7fffff;
|
|
i0 |= 0x800000;
|
|
|
|
result = (j0 < 0 ? 0 : i0 >> (23 - j0));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* The number is too large. It is left implementation defined
|
|
what happens. */
|
|
return (long long int) x;
|
|
}
|
|
|
|
return sx ? -result : result;
|
|
}
|
|
|
|
weak_alias (__llrintf, llrintf)
|