1988-04-07 11:40:46 +00:00
|
|
|
/*
|
|
|
|
|
(c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
|
|
|
|
|
See the copyright notice in the ACK home directory, in the file "Copyright".
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
/* $Header$ */
|
|
|
|
|
|
1988-04-07 10:57:49 +00:00
|
|
|
/*
|
|
|
|
|
#define PRT_EXT
|
|
|
|
|
SUBTRACT EXTENDED FORMAT
|
|
|
|
|
*/
|
|
|
|
|
/* assumes that e1 >= e2 on entry */
|
|
|
|
|
/* no test is made to check this */
|
|
|
|
|
/* so make sure yourself */
|
|
|
|
|
|
|
|
|
|
#include "FP_types.h"
|
|
|
|
|
sub_ext(e1,e2)
|
|
|
|
|
EXTEND *e1,*e2;
|
|
|
|
|
{
|
|
|
|
|
#ifdef PRT_EXT
|
|
|
|
|
prt_ext("before SUB_EXT() e1:",e1);
|
|
|
|
|
prt_ext("before SUB_EXT() e2:",e2);
|
|
|
|
|
#endif PRT_EXT
|
|
|
|
|
if (e2->m2 > e1->m2)
|
|
|
|
|
e1->m1 -= 1; /* carry in */
|
|
|
|
|
e1->m1 -= e2->m1;
|
|
|
|
|
e1->m2 -= e2->m2;
|
|
|
|
|
#ifdef PRT_EXT
|
|
|
|
|
prt_ext("after SUB_EXT() e1:",e1);
|
|
|
|
|
#endif PRT_EXT
|
|
|
|
|
nrm_ext(e1);
|
|
|
|
|
#ifdef PRT_EXT
|
|
|
|
|
prt_ext("after NRM_EXT() e1:",e1);
|
|
|
|
|
#endif PRT_EXT
|
|
|
|
|
}
|
