mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-24 07:31:32 +00:00
86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
|
/* Round argument to nearest integral value according to current rounding
|
||
|
|
direction.
|
||
|
|
Copyright (C) 1997, 1999, 2004, 2006 Free Software Foundation, Inc.
|
||
|
|
This file is part of the GNU C Library.
|
||
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
|
||
|
|
Jakub Jelinek <jj@ultra.linux.cz>, 1999.
|
||
|
|
|
||
|
|
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, write to the Free
|
||
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||
|
|
02111-1307 USA. */
|
||
|
|
|
||
|
|
#include "quadmath-imp.h"
|
||
|
|
|
||
|
|
static const __float128 two112[2] =
|
||
|
|
{
|
||
|
|
5.19229685853482762853049632922009600E+33Q, /* 0x406F000000000000, 0 */
|
||
|
|
-5.19229685853482762853049632922009600E+33Q /* 0xC06F000000000000, 0 */
|
||
|
|
};
|
||
|
|
|
||
|
|
long int
|
||
|
|
lrintq (__float128 x)
|
||
|
|
{
|
||
|
|
int32_t j0;
|
||
|
|
uint64_t i0,i1;
|
||
|
|
volatile __float128 w;
|
||
|
|
__float128 t;
|
||
|
|
long int result;
|
||
|
|
int sx;
|
||
|
|
|
||
|
|
GET_FLT128_WORDS64 (i0, i1, x);
|
||
|
|
j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
|
||
|
|
sx = i0 >> 63;
|
||
|
|
i0 &= 0x0000ffffffffffffLL;
|
||
|
|
i0 |= 0x0001000000000000LL;
|
||
|
|
|
||
|
|
if (j0 < 48)
|
||
|
|
{
|
||
|
|
w = two112[sx] + x;
|
||
|
|
t = w - two112[sx];
|
||
|
|
GET_FLT128_WORDS64 (i0, i1, t);
|
||
|
|
j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
|
||
|
|
i0 &= 0x0000ffffffffffffLL;
|
||
|
|
i0 |= 0x0001000000000000LL;
|
||
|
|
|
||
|
|
result = (j0 < 0 ? 0 : i0 >> (48 - j0));
|
||
|
|
}
|
||
|
|
else if (j0 < (int32_t) (8 * sizeof (long int)) - 1)
|
||
|
|
{
|
||
|
|
if (j0 >= 112)
|
||
|
|
result = ((long int) i0 << (j0 - 48)) | (i1 << (j0 - 112));
|
||
|
|
else
|
||
|
|
{
|
||
|
|
w = two112[sx] + x;
|
||
|
|
t = w - two112[sx];
|
||
|
|
GET_FLT128_WORDS64 (i0, i1, t);
|
||
|
|
j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
|
||
|
|
i0 &= 0x0000ffffffffffffLL;
|
||
|
|
i0 |= 0x0001000000000000LL;
|
||
|
|
|
||
|
|
if (j0 == 48)
|
||
|
|
result = (long int) i0;
|
||
|
|
else
|
||
|
|
result = ((long int) i0 << (j0 - 48)) | (i1 >> (112 - j0));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
/* The number is too large. It is left implementation defined
|
||
|
|
what happens. */
|
||
|
|
return (long int) x;
|
||
|
|
}
|
||
|
|
|
||
|
|
return sx ? -result : result;
|
||
|
|
}
|