extern int arch_get_op_estimated_cost(const arch_env_t *env, const ir_node *irn);
arch_inverse_t *arch_get_inverse(const ir_node *irn, int i, arch_inverse_t *inverse, struct obstack *obstack);
int arch_possible_memory_operand(const ir_node *irn, unsigned int i);
-extern void arch_perform_memory_operand(const arch_env_t *env, ir_node *irn, ir_node *spill, unsigned int i);
+void arch_perform_memory_operand(ir_node *irn, ir_node *spill, unsigned int i);
/**
* Get the register requirements for a node.