58 lines
1.1 KiB
C
58 lines
1.1 KiB
C
|
/* int _DivDecFast(pDst,pSrc1,pSrc2);
|
||
|
|
*
|
||
|
|
* ARGUMENT
|
||
|
|
* DEC *pDst;
|
||
|
|
* DEC *pSrc1,pSrc2;
|
||
|
|
*
|
||
|
|
* DESCRIPTION
|
||
|
|
* Divides pDst = pSrc1 / pSrc2, to 64 bits of accuracy.
|
||
|
|
* This code is about 1/3 faster than ddix.
|
||
|
|
*
|
||
|
|
* SIDE EFFECTS
|
||
|
|
* None.
|
||
|
|
*
|
||
|
|
* RETURNS
|
||
|
|
* Returns GM_SUCCESS if successful, otherwise the error code.
|
||
|
|
* wGMError is not changed.
|
||
|
|
*
|
||
|
|
* AUTHOR
|
||
|
|
* Jared Levy 05-JAN-1987 17:30
|
||
|
|
* Copyright (C) 1987-1990 Greenleaf Software Inc. All rights reserved.
|
||
|
|
*
|
||
|
|
* MODIFICATIONS
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include "gm.h"
|
||
|
|
#include "gmsystem.h"
|
||
|
|
int _DivProcFast();
|
||
|
|
|
||
|
|
int _DivDecFast(pDst,pSrc1,pSrc2)
|
||
|
|
DEC *pDst;
|
||
|
|
DEC *pSrc1,*pSrc2;
|
||
|
|
{
|
||
|
|
|
||
|
|
/* check that pSrc2 is nonzero */
|
||
|
|
if (_MacIsDecZ(pSrc2))
|
||
|
|
return(GM_DIV0);
|
||
|
|
|
||
|
|
/* check whether scr1 is zero */
|
||
|
|
if (_MacIsDecZ(pSrc1)) {
|
||
|
|
_MacDCopy(pDst, pSrc1);
|
||
|
|
return(GM_SUCCESS);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (_DivProcFast(pDst,pSrc1,pSrc2) != GM_SUCCESS)
|
||
|
|
return(GM_OVERFLOW);
|
||
|
|
|
||
|
|
/* if quotient is zero, an underflow has occured */
|
||
|
|
if (_MacIsDecZ(pDst))
|
||
|
|
return(GM_UNDERFLOW);
|
||
|
|
|
||
|
|
/* if the signs of the sources are different, pDst=-pDst */
|
||
|
|
pDst->dc.attr=pSrc1->dc.attr^pSrc2->dc.attr;
|
||
|
|
|
||
|
|
return(GM_SUCCESS);
|
||
|
|
}
|