graphite.c (graphite_trans_scop_block): Do not block single nested loops.

2009-01-17  Sebastian Pop  <sebastian.pop@amd.com>
	    Tobias Grosser  <tobi.grosser@amd.com>

	* graphite.c (graphite_trans_scop_block): Do not block single
	nested loops.


Co-Authored-By: Tobias Grosser <tobi.grosser@amd.com>

From-SVN: r143468

gcc/ChangeLog

+2009-01-17  Sebastian Pop  <sebastian.pop@amd.com>
+	    Tobias Grosser  <tobi.grosser@amd.com>
+
+	* graphite.c (graphite_trans_scop_block): Do not block single
+	nested loops.
+
 2009-01-16  Alexandre Oliva  <aoliva@redhat.com>
 
 	* ebitmap.h (ebitmap_iter_init): Initialize all fields.

gcc/graphite.c

@@ -5948,7 +5948,7 @@ graphite_trans_scop_block (scop_p scop)
   j++;
 
   /* Found perfect loop nest.  */
-  if (last_nb_loops - j > 0)
+  if (last_nb_loops - j >= 2)
     transform_done |= graphite_trans_loop_block (bbs, last_nb_loops - j);
   VEC_free (graphite_bb_p, heap, bbs);