/*
* Copyright (c) 1994-2000 FUJITSU LABORATORIES LIMITED
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* copyrights, in and to the SOFTWARE.
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* $OpenXM: OpenXM_contrib2/asir2018/engine/PDM.c,v 1.2 2018/09/28 08:20:28 noro Exp $
*/
#ifndef MODULAR
#define MODULAR
#endif
#include "b.h"
#include "ca.h"
#include "polydiv.c"
int divtmp(VL vl,int mod,P p1,P p2,P *q)
{
register int i,j;
register DCP dc1,dc2,dc;
P m,m1,s,dvr,t;
P *pq,*pr,*pd;
V v1,v2;
Z deg1,deg2;
int d1,d2,sgn;
if ( !p1 ) {
*q = 0;
return 1;
} else if ( NUM(p2) ) {
divsmp(vl,mod,p1,p2,q);
return 1;
} else if ( NUM(p1) ) {
*q = 0;
return 0;
} else if ( ( v1 = VR(p1) ) == ( v2 = VR(p2) ) ) {
dc1 = DC(p1); dc2 = DC(p2);
deg1 = DEG(dc1); deg2 = DEG(dc2);
sgn = cmpz(deg1,deg2);
if ( sgn == 0 )
if ( !divtmp(vl,mod,COEF(dc1),COEF(dc2),&m) ) {
*q = 0;
return 0;
} else {
mulmp(vl,mod,p2,m,&m1); submp(vl,mod,p1,m1,&s);
if ( !s ) {
*q = m;
return 1;
} else {
*q = 0;
return 0;
}
}
else if ( sgn < 0 ) {
*q = 0;
return 0;
} else {
if ( !smallz(deg1) ) {
error("divtmp : invalid input");
*q = 0;
return ( 0 );
}
d1 = ZTOS(deg1); d2 = ZTOS(deg2);
W_CALLOC(d1-d2,P,pq); W_CALLOC(d1,P,pr); W_CALLOC(d2,P,pd);
for ( dc = dc1; dc; dc = NEXT(dc) )
pr[ZTOS(DEG(dc))] = COEF(dc);
for ( dc = dc2; dc; dc = NEXT(dc) )
pd[ZTOS(DEG(dc))] = COEF(dc);
for ( dvr = COEF(dc2), i = d1 - d2; i >= 0; i-- )
if ( !pr[i+d2] )
continue;
else if ( !divtmp(vl,mod,pr[i+d2],dvr,&m) ) {
*q = 0;
return 0;
} else {
pq[i] = m;
for ( j = d2; j >= 0; j-- ) {
mulmp(vl,mod,pq[i],pd[j],&m);
submp(vl,mod,pr[i + j],m,&s); pr[i + j] = s;
}
}
plisttop(pq,v1,d1 - d2,&m); plisttop(pr,v1,d1 - 1,&t);
if ( t ) {
*q = 0;
return 0;
} else {
*q = m;
return 1;
}
}
} else {
for ( ; (v1 != vl->v) && (v2 != vl->v); vl = NEXT(vl) );
if ( v2 == vl->v ) {
*q = 0;
return 0;
} else
return divtdcmp(vl,mod,p1,p2,q);
}
}
int divtdcmp(VL vl,int mod,P p1,P p2,P *q)
{
P m;
register DCP dc,dcr,dcr0;
for ( dc = DC(p1), dcr0 = 0; dc; dc = NEXT(dc) )
if ( !divtmp(vl,mod,COEF(dc),p2,&m) ) {
*q = 0;
return 0;
} else {
NEXTDC(dcr0,dcr); DEG(dcr) = DEG(dc); COEF(dcr) = m; NEXT(dcr) = 0;
}
MKP(VR(p1),dcr0,*q);
return 1;
}