fix firm backend

[libfirm] / ir / be / belive.h

diff --git a/ir/be/belive.h b/ir/be/belive.h
index f368fb3..4772ac3 100644 (file)
--- a/ir/be/belive.h
+++ b/ir/be/belive.h
@@ -49,9 +49,9 @@ void be_liveness_recompute(be_lv_t *lv);
 /**
  * Update the liveness information for a single node.
  * It is irrelevant if there is liveness information present for the node.
- * The liveness information for the node is firstly deleted and then recompute.
- * So, if the node is fresh and never recorded inf the liveness information
- * before, it is more efficient to call be_liveness_introduce().
+ * The liveness information for the node is firstly deleted and then recomputed.
+ * If the node is fresh and never recorded inf the liveness information before,
+ * it is more efficient to call be_liveness_introduce().
  */
 void be_liveness_update(be_lv_t *lv, ir_node *irn);
 
@@ -145,6 +145,8 @@ pset *be_liveness_end_of_block(const be_lv_t *lv, const arch_env_t *arch_env, co
 
 /**
  * Compute a set of nodes which are live at another node.
+ * BEWARE: This is the liveness immediately after the node,
+ *         so the node itself is alive but it's operands maybe not.
  * @param arch_env The architecture environment.
  * @param cls      The register class to consider.
  * @param pos      The node.
@@ -153,6 +155,18 @@ pset *be_liveness_end_of_block(const be_lv_t *lv, const arch_env_t *arch_env, co
  */
 pset *be_liveness_nodes_live_at(const be_lv_t *lv, const arch_env_t *arch_env, const arch_register_class_t *cls, const ir_node *pos, pset *live);
 
+/**
+ * Compute a set of nodes which are live at another node.
+ * BEWARE: This is the liveness immediately before the node,
+ *         so the node itself is not alive but it's operands are.
+ * @param arch_env The architecture environment.
+ * @param cls      The register class to consider.
+ * @param pos      The node.
+ * @param live     The set to put them into.
+ * @return live.
+ */
+pset *be_liveness_nodes_live_at_input(const be_lv_t *lv, const arch_env_t *arch_env, const arch_register_class_t *cls, const ir_node *pos, pset *live);
+
 
 /**
  * FIXME: Need comment