/* $OpenXM: OpenXM_contrib2/asir2000/engine-27/ddN-27.c,v 1.1 1999/12/03 07:39:08 noro Exp $ */
#include "ca-27.h"
#include "base.h"
#include "inline.h"
void divn_27(n1,n2,nq,nr)
N n1,n2,*nq,*nr;
{
int tmp;
int br;
int j,d,d1,d2,dd;
int *m1,*m1e,*m2,*mr;
N q,r;
if ( !n2 )
error("divn: division by 0");
else if ( !n1 ) {
*nq = 0; *nr = 0;
} else if ( UNIN(n2) ) {
*nq = n1; *nr = 0;
} else if ( (d1 = PL(n1)) < (d2 = PL(n2)) ) {
*nr = n1; *nq = 0;
} else if ( d2 == 1 ) {
if ( d1 == 1 ) {
DQR(BD(n1)[0],BD(n2)[0],br,tmp)
STON(br,*nq); STON(tmp,*nr);
} else {
tmp = divin_27(n1,BD(n2)[0],nq); STON(tmp,*nr);
}
return;
} else if ( (d1 == d2) && ((tmp = cmpn(n1,n2)) <= 0) )
if ( !tmp ) {
*nr = 0; *nq = ONEN;
} else {
*nr = n1; *nq = 0;
}
else {
d = BASE27/(BD(n2)[d2-1] + 1); dd = d1-d2;
m1 = W_ALLOC(d1+1); m2 = W_ALLOC(d2+1);
mulin_27(n1,d,m1); mulin_27(n2,d,m2);
*nq = q = NALLOC(dd+1);
divnmain_27(d1,d2,m1,m2,BD(q));
PL(q) = (BD(q)[dd]?dd+1:dd);
for ( j = d2-1; (j >= 0) && (m1[j] == 0); j--);
if ( j == -1 )
*nr = 0;
else {
*nr = r = NALLOC(j+1);
for ( br = 0, m1e = m1+j, mr = BD(r)+j;
m1e >= m1; m1e--, mr-- ) {
DSAB27(d,br,*m1e,*mr,br)
}
PL(r) = (BD(r)[j]?j+1:j);
}
}
}
void divnmain_27(d1,d2,m1,m2,q)
int d1,d2;
int *m1,*m2,*q;
{
unsigned int tmp;
int *n1,*n2;
int i,j;
int l,r;
int u,qhat;
int v1,v2;
v1 = m2[d2-1]; v2 = m2[d2-2];
for ( j = d1-d2, m1 += j, q += j; j >= 0; j--, q--, m1-- ) {
n1 = m1+d2; n2 = m1+d2-1;
if ( *n1 == v1 ) {
qhat = BASE27 - 1; r = *n1 + *n2;
} else {
DSAB27(v1,*n1,*n2,qhat,r)
}
DM27(v2,qhat,u,l)
while ( 1 ) {
if ((r > u) || ((r == u) && (*(n1-2) >= l)))
break;
if ( ( l -= v2 ) < 0 ) {
l += BASE27; u--;
}
r += v1; qhat--;
}
if ( qhat ) {
for ( i = d2, u = 0, n1 = m1, n2 = m2; i > 0; i--, n1++, n2++ ) {
DMA27(*n2,qhat,u,u,l)
if ( (l = *n1 - l) < 0 ) {
u++; *n1 = l + BASE27;
} else
*n1 = l;
}
if ( *n1 < u ) {
for ( i = d2, qhat--, r = 0, n1 = m1, n2 = m2;
i > 0; i--, n1++, n2++ ) {
l = *n1 + *n2 + r; *n1 = l % BASE27; r = l / BASE27;
}
}
*n1 = 0;
}
*q = qhat;
}
}
void mulin_27(n,d,p)
N n;
int d;
int *p;
{
int carry;
int *m,*me;
bzero((char *)p,(int)((PL(n)+1)*sizeof(int)));
for ( carry = 0, m = BD(n), me = m+PL(n); m < me; p++, m++ ) {
carry += *p;
DMA27(*m,d,carry,carry,*p)
}
*p = carry;
}
int divin_27(n,dvr,q)
N n;
int dvr;
N *q;
{
int up,d;
int *m,*mq,*md;
N nq;
d = PL(n); m = BD(n);
if ( ( d == 1 ) && ( dvr > *m ) ) {
*q = 0;
return( *m );
}
*q = nq = NALLOC(d);
for ( md = m+d-1, mq = BD(nq)+d-1, up = 0; md >= m; md--, mq-- ) {
DSAB27(dvr,up,*md,*mq,up)
}
PL(nq) = (BD(nq)[d-1]?d:d-1);
return ( up );
}