do not schedule Unknown

diff --git a/ir/be/belistsched.c b/ir/be/belistsched.c
index 498cf28..ffd9668 100644 (file)
--- a/ir/be/belistsched.c
+++ b/ir/be/belistsched.c
@@ -47,6 +47,8 @@
 #include <libcore/lc_opts_enum.h>
 #endif /* WITH_LIBCORE */
 
+#define BE_SCHED_NODE(irn) (be_is_Keep(irn) || be_is_CopyKeep(irn) || be_is_RegParams(irn))
+
 enum {
        BE_SCHED_SELECT_TRIVIAL  = 0,
        BE_SCHED_SELECT_REGPRESS = 1,
@@ -337,10 +339,13 @@ static INLINE int must_appear_in_schedule(const list_sched_selector_t *sel, void
 {
        int res = -1;
 
-       if(sel->to_appear_in_schedule)
+       if (get_irn_n_edges(irn) < 1)
+               return 0;
+
+       if (sel->to_appear_in_schedule)
                res = sel->to_appear_in_schedule(block_env, irn);
 
-       return res >= 0 ? res : (to_appear_in_schedule(irn) || be_is_Keep(irn) || be_is_CopyKeep(irn) || be_is_RegParams(irn));
+       return res >= 0 ? res : ((to_appear_in_schedule(irn) || BE_SCHED_NODE(irn)) && ! is_Unknown(irn));
 }
 
 /**
@@ -390,7 +395,7 @@ static void add_tuple_projs(block_sched_env_t *env, ir_node *irn)
 
        assert(get_irn_mode(irn) == mode_T && "Mode of node must be tuple");
 
-       if(is_Bad(irn))
+       if (is_Bad(irn))
                return;