--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/pr42389.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,87 @@
+/* { dg-do compile { target powerpc*-*-* ia64-*-* i?86-*-* x86_64-*-* } } */
+/* { dg-options "-O2 -fselective-scheduling -fsel-sched-pipelining -fsched-pressure" } */
+
+struct s_linked_f_pointer
+{
+  struct s_linked_f_pointer *next;
+  float *fptr;
+};
+struct s_trace
+{
+  int index;
+};
+struct s_rr_cost
+{
+  float base_cost;
+  float acc_cost;
+};
+extern int num_nets;
+extern struct s_trace **trace_head;
+extern struct s_rr_cost *rr_cost;
+struct s_rr_route
+{
+  float cost;
+};
+static int heap_tail;
+extern struct s_linked_f_pointer *rr_modified_head;
+extern struct s_rr_route *rr_route;
+
+void
+empty_heap (void)
+{
+  heap_tail = 1;
+}
+
+void
+reset_path_costs (void)
+{
+  struct s_linked_f_pointer *mod_ptr;
+  if (rr_modified_head != ((void *) 0))
+    {
+      mod_ptr = rr_modified_head;
+      while (mod_ptr->next != ((void *) 0))
+	{
+	  *(mod_ptr->fptr) = 1.e30;
+	  mod_ptr = mod_ptr->next;
+	}
+      rr_modified_head = ((void *) 0);
+    }
+}
+
+static void
+route_net (int inet)
+{
+  int i;
+  for (i = 1; i < inet; i++)
+    reset_path_costs ();
+  empty_heap ();
+  reset_path_costs ();
+}
+
+void
+pathfinder_update_one_cost (int inet, float pres_fac, float acc_fac)
+{
+  struct s_trace *tptr;
+  int inode = 0;
+
+  tptr = trace_head[inet];
+  inode = tptr->index;
+  rr_route[inode].cost = rr_cost[inode].base_cost + rr_cost[inode].acc_cost;
+}
+
+int
+try_route (int n, float x, float y)
+{
+  int inet, itry;
+  float pres_fac;
+  for (itry = 1; itry <= n; itry++)
+    {
+      for (inet = 0; inet < num_nets; inet++)
+	{
+	  route_net (inet);
+	  pathfinder_update_one_cost (inet, pres_fac, x);
+	}
+      pres_fac *= y;
+    }
+}
+