===================================================================
@@ -1309,7 +1309,9 @@ thread_block_1 (basic_block bb, bool nol
and thread this elsewhere, so just cancel the jump threading
request by clearing the AUX field now. */
if (bb->loop_father != e2->src->loop_father
- && !loop_exit_edge_p (e2->src->loop_father, e2))
+ && (!loop_exit_edge_p (e2->src->loop_father, e2)
+ || flow_loop_nested_p (bb->loop_father,
+ e2->dest->loop_father)))
{
/* Since this case is not handled by our special code
to thread through a loop header, we must explicitly
===================================================================
@@ -0,0 +1,28 @@
+/* { dg-do compile } */
+
+long a, d;
+int b, c;
+void fn1()
+{
+ int e = -1L, f = 2, g = 8;
+ for (;;)
+ {
+ for (; b; g++)
+ ;
+ int i;
+ for (; c;)
+ {
+ i = 5;
+ for (; e >= 1; i--)
+ ;
+ }
+ d = f ?: a;
+ if (d)
+ {
+ e = 0;
+ for (; i;)
+ for (; g < 3; f++)
+ ;
+ }
+ }
+}