[backport from gcc-4.7/trunk r183519, the commit forgot to add the
 test case, took it from the original patch submission <mikpe@it.uu.se>]

gcc/

2012-01-25  Andrey Belevantsev  <abel@ispras.ru>

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

gcc/testsuite/

2012-01-25  Andrey Belevantsev  <abel@ispras.ru>

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

--- gcc-4.6.2/gcc/sel-sched-ir.h.~1~	2011-04-07 14:07:24.000000000 +0200
+++ gcc-4.6.2/gcc/sel-sched-ir.h	2012-02-05 18:38:14.000000000 +0100
@@ -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-4.6.2/gcc/testsuite/gcc.dg/pr48374.c.~1~	1970-01-01 01:00:00.000000000 +0100
+++ gcc-4.6.2/gcc/testsuite/gcc.dg/pr48374.c	2012-02-05 18:43:09.000000000 +0100
@@ -0,0 +1,17 @@
+/* { dg-do compile { target powerpc*-*-* ia64-*-* x86_64-*-* } } */
+/* { dg-options "-O -fschedule-insns2 -fsel-sched-pipelining -fsel-sched-pipelining-outer-loops -fselective-scheduling2 --param max-sched-extend-regions-iters=2"  } */
+
+void foo (int y)
+{
+  switch (y)
+    {
+    case 3:
+    case 5:
+    case 7:
+    case 11:
+      break;
+    default:
+      __builtin_unreachable ();
+    }
+}
+