+ * Get the backend opcode of a backend node.
+ * @param irn The node.
+ * @return The backend opcode.
+ */
+be_opcode_t be_get_irn_opcode(const ir_node *irn);
+
+int be_is_Spill(const ir_node *irn);
+int be_is_Reload(const ir_node *irn);
+int be_is_Copy(const ir_node *irn);
+int be_is_Perm(const ir_node *irn);
+int be_is_Keep(const ir_node *irn);
+int be_is_CopyKeep(const ir_node *irn);
+int be_is_Call(const ir_node *irn);
+int be_is_Return(const ir_node *irn);
+int be_is_IncSP(const ir_node *irn);
+int be_is_SetSP(const ir_node *irn);
+int be_is_AddSP(const ir_node *irn);
+int be_is_RegParams(const ir_node *irn);
+int be_is_StackParam(const ir_node *irn);
+int be_is_FrameAddr(const ir_node *irn);
+int be_is_FrameLoad(const ir_node *irn);
+int be_is_FrameStore(const ir_node *irn);
+int be_is_Barrier(const ir_node *irn);
+
+/**
+ * Get the entity on the stack frame the given node uses.
+ * @param irn The node.
+ * @return The entity on the stack frame used by the node or NULL,
+ * if the node does not access the stack frame or is no back-end node.
+ *
+ */
+entity *be_get_frame_entity(const ir_node *irn);
+
+void be_set_Spill_entity(ir_node *irn, entity *ent);
+entity *be_get_spill_entity(const ir_node *irn);
+
+ir_node *be_get_Spill_context(const ir_node *irn);
+
+/**
+ * Set the entities of a Reload to the ones of the Spill it is pointing to.
+ * @param irg The graph.
+ */
+void be_copy_entities_to_reloads(ir_graph *irg);
+
+/**
+ * Impose a register constraint on a backend node.
+ * @param irn The node.
+ * @param pos The position of the argument/result. Results range from -1..-m and arguments form 0..n
+ * @param reg The register which is admissible for that node, argument/result and position.
+ */
+void be_set_constr_single_reg(ir_node *irn, int pos, const arch_register_t *reg);
+
+/**
+ * Impose register constraints on a backend node.
+ * The register subsets given by the limited function in @p req are copied to the backend node.
+ * This requires that the constraint type of the @p req is arch_register_req_type_limited.
+ * @param irn The backend node.
+ * @param pos The position (@see be_set_constr_single_reg()).
+ * @param req The register requirements which shall be transferred.
+ */
+void be_set_constr_limited(ir_node *irn, int pos, const arch_register_req_t *req);
+
+/**
+ * Set the flags of a node.
+ * @param irn The node itself.
+ * @param pos The position (0..n) for arguments, (-1..-m) for results.
+ * @param flags The flags to set for that node and position.
+ */
+void be_node_set_flags(ir_node *irn, int pos, arch_irn_flags_t flags);
+
+/**
+ * Set the register class of a node.
+ * @param irn The node itself.
+ * @param pos The position (0..n) for arguments, (-1..-m) for results.
+ * @param flags The register class to set for that node and position.
+ */
+void be_node_set_reg_class(ir_node *irn, int pos, const arch_register_class_t *cls);
+
+/**
+ * Make a new phi handler.
+ * @param env The architecture environment.
+ * @return A new phi handler.
+ */
+arch_irn_handler_t *be_phi_handler_new(const arch_env_t *arch_env);
+
+/**
+ * Free a phi handler.
+ * @param handler The handler to free.
+ */
+void be_phi_handler_free(arch_irn_handler_t *handler);
+
+/**
+ * Reset the register data in the phi handler.
+ * This should be called on each new graph and deletes the register information of the current graph.