spill preparation needs liveness

[r26646]

diff --git a/ir/be/bespill.c b/ir/be/bespill.c
index e525562..573aaa1 100644 (file)
--- a/ir/be/bespill.c
+++ b/ir/be/bespill.c
@@ -247,6 +247,9 @@ void be_pre_spill_prepare_constr(be_irg_t *birg,
        memset(&env, 0, sizeof(env));
        env.birg = birg;
        env.cls  = cls;
+
+       be_assure_liveness(birg);
+
        irg_block_walk_graph(irg, pre_spill_prepare_constr_walker, NULL, &env);
 }