mirror of
https://github.com/ZDoom/gzdoom.git
synced 2024-11-08 22:11:09 +00:00
71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
/****************************************************************
|
|
|
|
The author of this software is David M. Gay.
|
|
|
|
Copyright (C) 1998, 1999 by Lucent Technologies
|
|
All Rights Reserved
|
|
|
|
Permission to use, copy, modify, and distribute this software and
|
|
its documentation for any purpose and without fee is hereby
|
|
granted, provided that the above copyright notice appear in all
|
|
copies and that both that the copyright notice and this
|
|
permission notice and warranty disclaimer appear in supporting
|
|
documentation, and that the name of Lucent or any of its entities
|
|
not be used in advertising or publicity pertaining to
|
|
distribution of the software without specific, written prior
|
|
permission.
|
|
|
|
LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
|
|
INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
|
|
IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
|
|
SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
|
|
IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
|
|
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
|
|
THIS SOFTWARE.
|
|
|
|
****************************************************************/
|
|
|
|
/* Please send bug reports to David M. Gay (dmg at acm dot org,
|
|
* with " at " changed at "@" and " dot " changed to "."). */
|
|
|
|
#include "gdtoaimp.h"
|
|
|
|
double
|
|
ulp
|
|
#ifdef KR_headers
|
|
(x) double x;
|
|
#else
|
|
(double _x)
|
|
#endif
|
|
{
|
|
Long L;
|
|
U x, a;
|
|
|
|
dval(x) = _x;
|
|
L = (word0(x) & Exp_mask) - (P-1)*Exp_msk1;
|
|
#ifndef Sudden_Underflow
|
|
if (L > 0) {
|
|
#endif
|
|
#ifdef IBM
|
|
L |= Exp_msk1 >> 4;
|
|
#endif
|
|
word0(a) = L;
|
|
word1(a) = 0;
|
|
#ifndef Sudden_Underflow
|
|
}
|
|
else {
|
|
L = -L >> Exp_shift;
|
|
if (L < Exp_shift) {
|
|
word0(a) = 0x80000 >> L;
|
|
word1(a) = 0;
|
|
}
|
|
else {
|
|
word0(a) = 0;
|
|
L -= Exp_shift;
|
|
word1(a) = L >= 31 ? 1 : 1 << 31 - L;
|
|
}
|
|
}
|
|
#endif
|
|
return dval(a);
|
|
}
|