64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2001-2002, David Janssens
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in the
|
||
|
|
* documentation and/or other materials provided with the distribution.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
|
||
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
||
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "fix.h"
|
||
|
|
#include <math.h> /*Add Antonin : multbug1*/
|
||
|
|
|
||
|
|
#ifdef WIN32
|
||
|
|
#define int64 __int64
|
||
|
|
#else
|
||
|
|
#define int64 long long
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Multiply two fixed-precision rational numbers.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*int fix_mul(int a, int b)
|
||
|
|
{
|
||
|
|
return (int) ((int64) a * (int64) b >> 13);
|
||
|
|
}*/
|
||
|
|
|
||
|
|
|
||
|
|
/*Mod Antonin : multbug1*/
|
||
|
|
/*
|
||
|
|
int fix_mul(int a, int b)
|
||
|
|
{
|
||
|
|
double tmp= (double) ((int64) a * (int64) b);
|
||
|
|
int64 v = (int64) ((fabs(tmp/8192.0)>=floor(fabs(tmp/8192.0))+0.5)?fabs(tmp/8192.0)+1.0:fabs(tmp/8192.0));
|
||
|
|
v = (tmp<0)?-v:v;
|
||
|
|
return (int) v;
|
||
|
|
}
|
||
|
|
*/
|
||
|
|
/*doM*/
|
||
|
|
|
||
|
|
int fix_mul(int a, int b) /* Luke Lee optimized : 11/16/2004*/
|
||
|
|
{
|
||
|
|
int64 temp = (int64) a * (int64) b >> 12;
|
||
|
|
return (int) ((temp >> 1) + (temp & 1)) ;
|
||
|
|
}
|
||
|
|
|