Don't handle BBs with more than 2 preds or succs.

2010-05-26  Sebastian Pop  <sebastian.pop@amd.com>

	* tree-if-conv.c (if_convertible_bb_p): Don't handle BBs with more
	than 2 predecessors or more than 2 successors.

From-SVN: r159884

gcc/ChangeLog

 2010-05-26  Sebastian Pop  <sebastian.pop@amd.com>
 
+	* tree-if-conv.c (if_convertible_bb_p): Don't handle BBs with more
+	than 2 predecessors or more than 2 successors.
+
+2010-05-26  Sebastian Pop  <sebastian.pop@amd.com>
+
 	* tree-if-conv.c (if_convertible_loop_p): Avoid if-conversion
 	of loops in which the data dependence analysis fails.
 

gcc/tree-if-conv.c

@@ -460,6 +460,10 @@ if_convertible_bb_p (struct loop *loop, basic_block bb, basic_block exit_bb)
   if (dump_file && (dump_flags & TDF_DETAILS))
     fprintf (dump_file, "----------[%d]-------------\n", bb->index);
 
+  if (EDGE_COUNT (bb->preds) > 2
+      || EDGE_COUNT (bb->succs) > 2)
+    return false;
+
   if (exit_bb)
     {
       if (bb != loop->latch)