re PR rtl-optimization/48374 (ICE: in single_succ_edge, at basic-block.h:562…

re PR rtl-optimization/48374 (ICE: in single_succ_edge, at basic-block.h:562 with -fselective-scheduling2 and __builtin_unreachable())

gcc:
	PR rtl-optimization/48374
        * sel-sched-ir.h (get_all_loop_exits): Check for zero successors.

testsuite:
        PR rtl-optimization/48374
        * gcc.dg/pr48374.c: New test.

From-SVN: r183519

gcc/ChangeLog

 2012-01-25  Andrey Belevantsev  <abel@ispras.ru>
 
+	PR rtl-optimization/48374
+	* sel-sched-ir.h (get_all_loop_exits): Check for zero successors. 
+
+2012-01-25  Andrey Belevantsev  <abel@ispras.ru>
+
 	* tree-predcom.c (tree_predictive_commoning_loop): Bail out when
 	compute_data_dependences_for_loop returns false.
 	* tree-parloops.c (loop_parallel_p): Likewise.

gcc/sel-sched-ir.h

@@ -1119,7 +1119,8 @@ get_all_loop_exits (basic_block bb)
   /* If bb is empty, and we're skipping to loop exits, then
      consider bb as a possible gate to the inner loop now.  */
   while (sel_bb_empty_or_nop_p (bb)
-	 && in_current_region_p (bb))
+	 && in_current_region_p (bb)
+	 && EDGE_COUNT (bb->succs) > 0)
     {
       bb = single_succ (bb);
 

gcc/testsuite/ChangeLog

+2012-01-25  Andrey Belevantsev  <abel@ispras.ru>
+
+	PR rtl-optimization/48374
+	* gcc.dg/pr48374.c: New test.
+
 2012-01-25  Greta Yorsh  <Greta.Yorsh@arm.com>
 
 	* gcc.dg/pr50908-2.c (dg-options): Add -fno-short-enums.