===================================================================
RCS file: /home/cvs/OpenXM_contrib2/asir2000/engine/NEZ.c,v
retrieving revision 1.1.1.1
retrieving revision 1.6
diff -u -p -r1.1.1.1 -r1.6
--- OpenXM_contrib2/asir2000/engine/NEZ.c	1999/12/03 07:39:08	1.1.1.1
+++ OpenXM_contrib2/asir2000/engine/NEZ.c	2010/02/19 08:27:19	1.6
@@ -1,4 +1,52 @@
-/* $OpenXM: OpenXM/src/asir99/engine/NEZ.c,v 1.1.1.1 1999/11/10 08:12:26 noro Exp $ */
+/*
+ * Copyright (c) 1994-2000 FUJITSU LABORATORIES LIMITED 
+ * All rights reserved.
+ * 
+ * FUJITSU LABORATORIES LIMITED ("FLL") hereby grants you a limited,
+ * non-exclusive and royalty-free license to use, copy, modify and
+ * redistribute, solely for non-commercial and non-profit purposes, the
+ * computer program, "Risa/Asir" ("SOFTWARE"), subject to the terms and
+ * conditions of this Agreement. For the avoidance of doubt, you acquire
+ * only a limited right to use the SOFTWARE hereunder, and FLL or any
+ * third party developer retains all rights, including but not limited to
+ * copyrights, in and to the SOFTWARE.
+ * 
+ * (1) FLL does not grant you a license in any way for commercial
+ * purposes. You may use the SOFTWARE only for non-commercial and
+ * non-profit purposes only, such as academic, research and internal
+ * business use.
+ * (2) The SOFTWARE is protected by the Copyright Law of Japan and
+ * international copyright treaties. If you make copies of the SOFTWARE,
+ * with or without modification, as permitted hereunder, you shall affix
+ * to all such copies of the SOFTWARE the above copyright notice.
+ * (3) An explicit reference to this SOFTWARE and its copyright owner
+ * shall be made on your publication or presentation in any form of the
+ * results obtained by use of the SOFTWARE.
+ * (4) In the event that you modify the SOFTWARE, you shall notify FLL by
+ * e-mail at risa-admin@sec.flab.fujitsu.co.jp of the detailed specification
+ * for such modification or the source code of the modified part of the
+ * SOFTWARE.
+ * 
+ * THE SOFTWARE IS PROVIDED AS IS WITHOUT ANY WARRANTY OF ANY KIND. FLL
+ * MAKES ABSOLUTELY NO WARRANTIES, EXPRESSED, IMPLIED OR STATUTORY, AND
+ * EXPRESSLY DISCLAIMS ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF THIRD PARTIES'
+ * RIGHTS. NO FLL DEALER, AGENT, EMPLOYEES IS AUTHORIZED TO MAKE ANY
+ * MODIFICATIONS, EXTENSIONS, OR ADDITIONS TO THIS WARRANTY.
+ * UNDER NO CIRCUMSTANCES AND UNDER NO LEGAL THEORY, TORT, CONTRACT,
+ * OR OTHERWISE, SHALL FLL BE LIABLE TO YOU OR ANY OTHER PERSON FOR ANY
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, PUNITIVE OR CONSEQUENTIAL
+ * DAMAGES OF ANY CHARACTER, INCLUDING, WITHOUT LIMITATION, DAMAGES
+ * ARISING OUT OF OR RELATING TO THE SOFTWARE OR THIS AGREEMENT, DAMAGES
+ * FOR LOSS OF GOODWILL, WORK STOPPAGE, OR LOSS OF DATA, OR FOR ANY
+ * DAMAGES, EVEN IF FLL SHALL HAVE BEEN INFORMED OF THE POSSIBILITY OF
+ * SUCH DAMAGES, OR FOR ANY CLAIM BY ANY OTHER PARTY. EVEN IF A PART
+ * OF THE SOFTWARE HAS BEEN DEVELOPED BY A THIRD PARTY, THE THIRD PARTY
+ * DEVELOPER SHALL HAVE NO LIABILITY IN CONNECTION WITH THE USE,
+ * PERFORMANCE OR NON-PERFORMANCE OF THE SOFTWARE.
+ *
+ * $OpenXM: OpenXM_contrib2/asir2000/engine/NEZ.c,v 1.5 2006/12/03 01:04:10 noro Exp $ 
+*/
 #include "ca.h"
 
 void nezgcdnpz(vl,ps,m,pr)
@@ -17,6 +65,9 @@ int m;
 	P **cp;
 	int *cn;
 
+	if ( m == 1 ) {
+		*pr = ps[0]; return;
+	}
 	pl = (P *)ALLOCA(m*sizeof(P)); 
 	ml = (DCP *)ALLOCA(m*sizeof(DCP)); 
 	cl = (Q *)ALLOCA(m*sizeof(Q));
@@ -263,9 +314,9 @@ P p0,*ps,*pr;
 	P *tps;
 	VL nvl1,nvl2,nvl,tvl;
 	V v;
-	int i,j,k,d0,dg,dg0,dmin;
-	VN vn0,vn1,vnt;
-	int nv,flag;
+	int i,j,k,d0,dg,dg0,dmin,z;
+	VN vn1;
+	int nv,flag,max;
 
 	/* set-up */
 	if ( NUM(p0) ) {
@@ -300,20 +351,20 @@ P p0,*ps,*pr;
 
 	mulp(nvl,p0,lg,&lgp0); k = dbound(v,lgp0)+1; cbound(nvl,lgp0,(Q *)&cbd);
 	for ( nv = 0, tvl = nvl; tvl; tvl = NEXT(tvl), nv++ );
-	W_CALLOC(nv,struct oVN,vn0); W_CALLOC(nv,struct oVN,vnt);
 	W_CALLOC(nv,struct oVN,vn1);
 	for ( i = 0, tvl = NEXT(nvl); tvl; tvl = NEXT(tvl), i++ )
-		vn1[i].v = vn0[i].v = tvl->v;
+		vn1[i].v = tvl->v;
 
 	/* main loop */
-	for ( dg = deg(v,tps[0]) + 1; ; next(vn0) )
-		do {
-			for ( i = 0, j = 0; vn0[i].v; i++ ) 
-				if ( vn0[i].n ) vnt[j++].v = (V)i;
-			vnt[j].n = 0;
+	/* finally, 'max' random evaluations will be generated */
+	for ( max = 1, dg = deg(v,tps[0]) + 1; ; max = 2*max )
+		for ( z = 0; z < max; z++ ) {
+			for ( i = 0; vn1[i].v; i++ )
+				vn1[i].n = mt_genrand()%max;
 
 			/* find b s.t. LC(p0)(b), LC(tps[i])(b) != 0 */
-			mulsgn(vn0,vnt,j,vn1); substvp(nvl,p0,vn1,&p00);
+			
+			substvp(nvl,p0,vn1,&p00);
 			flag = (!zerovpchk(nvl,lp0,vn1) && sqfrchk(p00));
 			for ( i = 0; flag && (i < m); i++ )
 				flag &= (!zerovpchk(nvl,LC(tps[i]),vn1));
@@ -346,7 +397,7 @@ P p0,*ps,*pr;
 					}
 				}
 			}
-		} while ( !nextbin(vnt,j) );
+		}
 }
 
 void intersectv(vl1,vl2,vlp)
@@ -445,5 +496,23 @@ P p;
 		for ( dc = DC(p), n = 0; dc; dc = NEXT(dc) )
 			n += lengthp(COEF(dc));
 		return n;
+	}
+}
+
+int nonzero_const_term(P p)
+{
+	DCP dc;
+
+	if ( !p )
+		return 0;
+	else if ( NUM(p) )
+		return 1;
+	else {
+		dc = DC(p);
+		for ( ; NEXT(dc); dc = NEXT(dc) );
+		if ( DEG(dc) )
+			return 0;
+		else
+			return nonzero_const_term(COEF(dc));
 	}
 }