50 lines
911 B
C
50 lines
911 B
C
/*
|
|
(c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
|
|
See the copyright notice in the ACK home directory, in the file "Copyright".
|
|
*/
|
|
|
|
/* $Header$ */
|
|
|
|
/*
|
|
MULTIPLY AND DISMEMBER PARTS (FIF 4)
|
|
*/
|
|
|
|
#include "FP_types.h"
|
|
#include "FP_shift.h"
|
|
|
|
_float sbf4();
|
|
|
|
struct fif4_returns {
|
|
_float ipart;
|
|
_float fpart;
|
|
};
|
|
|
|
fif4(p,x,y)
|
|
_float x,y;
|
|
struct fif4_returns *p;
|
|
{
|
|
|
|
EXTEND e1,e2;
|
|
|
|
extend((_double *)&y,&e1,sizeof(_float));
|
|
extend((_double *)&x,&e2,sizeof(_float));
|
|
/* do a multiply */
|
|
mul_ext(&e1,&e2);
|
|
e2 = e1;
|
|
compact(&e2, (_double *)&y, sizeof(_float));
|
|
if (e1.exp < 0) {
|
|
p->ipart = 0;
|
|
p->fpart = y;
|
|
return;
|
|
}
|
|
if (e1.exp > 30 - SGL_M1LEFT) {
|
|
p->ipart = y;
|
|
p->fpart = 0;
|
|
return;
|
|
}
|
|
b64_sft(&e1.m1, 63 - e1.exp);
|
|
b64_sft(&e1.m1, e1.exp - 63); /* "loose" low order bits */
|
|
compact(&e1,(_double *) &(p->ipart), sizeof(SINGLE));
|
|
p->fpart = sbf4(p->ipart, y);
|
|
}
|