===================================================================
RCS file: /home/cvs/OpenXM_contrib2/asir2000/engine/nd.c,v
retrieving revision 1.138
retrieving revision 1.143
diff -u -p -r1.138 -r1.143
--- OpenXM_contrib2/asir2000/engine/nd.c	2006/06/11 11:41:15	1.138
+++ OpenXM_contrib2/asir2000/engine/nd.c	2006/08/09 02:48:49	1.143
@@ -1,4 +1,4 @@
-/* $OpenXM: OpenXM_contrib2/asir2000/engine/nd.c,v 1.137 2006/06/11 06:57:54 noro Exp $ */
+/* $OpenXM$ */
 
 #include "nd.h"
 
@@ -1592,6 +1592,7 @@ NODE nd_gb(int m,int ishomo,int checkonly)
 	NDV nfv;
 	Q q,num,den;
 	union oNDC dn;
+	int diag_count = 0;
 
 	g = 0; d = 0;
 	for ( i = 0; i < nd_psn; i++ ) {
@@ -1604,6 +1605,7 @@ again:
 		l = nd_minp(d,&d);
 		if ( SG(l) != sugar ) {
 			if ( ishomo ) {
+				diag_count = 0;
 				stat = do_diagonalize(sugar,m);
 				if ( !stat ) {
 					NEXT(l) = d; d = l;
@@ -1639,6 +1641,15 @@ again:
 			}
 			nfv = ndtondv(m,nf); nd_free(nf);
 			nh = ndv_newps(m,nfv,0);
+			if ( !m && (ishomo && ++diag_count == diag_period) ) {
+				diag_count = 0;
+				stat = do_diagonalize(sugar,m);
+				if ( !stat ) {
+					NEXT(l) = d; d = l;
+					d = nd_reconstruct(1,d);
+					goto again;
+				}
+			}
 			d = update_pairs(d,g,nh);
 			g = update_base(g,nh);
 			FREENDP(l);
@@ -2208,9 +2219,15 @@ void ndv_setup(int mod,int trace,NODE f,int dont_sort)
 	for ( nd_psn = 0, s = f; s; s = NEXT(s) ) if ( BDY(s) ) nd_psn++;
 	w = (NDV *)ALLOCA(nd_psn*sizeof(NDV));
 	for ( i = 0, s = f; s; s = NEXT(s) ) if ( BDY(s) ) w[i++] = BDY(s);
-	if ( !dont_sort )
-		qsort(w,nd_psn,sizeof(NDV),
-			(int (*)(const void *,const void *))ndv_compare);
+	if ( !dont_sort ) {
+		/* XXX heuristic */
+		if ( !nd_ord->id && (nd_ord->ord.simple<2) )
+			qsort(w,nd_psn,sizeof(NDV),
+				(int (*)(const void *,const void *))ndv_compare_rev);
+		else
+			qsort(w,nd_psn,sizeof(NDV),
+				(int (*)(const void *,const void *))ndv_compare);
+	}
 	nd_pslen = 2*nd_psn;
 	nd_ps = (NDV *)MALLOC(nd_pslen*sizeof(NDV));
 	nd_ps_trace = (NDV *)MALLOC(nd_pslen*sizeof(NDV));