+/** Walks over the passed ir graph and collects all Phi nodes as a
+ * list built with the link field in their corresponding block.
+ * Further it collects all Proj nodes in a list of the node producing
+ * the tuple. In case of nested tuples the Projs are collected in the
+ * node producing the outermost Tuple.
+ * All other link fields are cleared afterwards.
+ */
+void collect_phiprojs(ir_graph *irg);
+
+/** Parts a block into two. This is useful to insert other blocks within a
+ * given block.
+ *
+ * Adds a new block (new_block) in the control flow before the block
+ * (old_block) of node. Moves node and its predecessors from old_block to
+ * new_block. Moves all Projs that depend on moved nodes and are in old_block
+ * to new_block. Moves all Phi nodes from old_block to new_block. To achieve
+ * this the routine assumes that all Phi nodes are in a list (using the link
+ * field) in the link field of old_block. Further it assumes that all Proj nodes
+ * are accessible by the link field of the nodes producing the Tuple. This
+ * can be established by collect_phiprojs(). part_block conserves this property.
+ * Adds a Jmp node to new_block that jumps to old_block.
+ * Assumes that node is contained in current_ir_graph. Sets current_block in
+ * this ir_graph to new_block.
+ *
+ * @param node The node were to break the block
+ */
+void part_block(ir_node *node);
+
+#endif /* ifndef _FIRM_IR_IRGMOD_H_ */