+/**
+ * Creates a Push instruction before the given schedule point.
+ *
+ * @param dbgi debug info
+ * @param irg the graph
+ * @param block the block
+ * @param stack the previous stack value
+ * @param schedpoint the new node is added before this node
+ * @param reg the register to pop
+ *
+ * @return the new stack value
+ */
+static ir_node *create_push(dbg_info *dbgi, ir_graph *irg, ir_node *block,
+ ir_node *stack, ir_node *schedpoint,
+ const arch_register_t *reg)
+{
+ const arch_register_t *esp = &ia32_gp_regs[REG_ESP];
+ ir_node *noreg, *nomem, *push, *val;
+
+ val = new_rd_ia32_ProduceVal(NULL, irg, block);
+ arch_set_irn_register(arch_env, val, reg);
+ sched_add_before(schedpoint, val);
+
+ noreg = ia32_new_NoReg_gp(cg);
+ nomem = get_irg_no_mem(irg);
+ push = new_rd_ia32_Push(dbgi, irg, block, noreg, noreg, nomem, val, stack);
+ sched_add_before(schedpoint, push);
+
+ stack = new_r_Proj(irg, block, push, mode_Iu, pn_ia32_Push_stack);
+ arch_set_irn_register(arch_env, stack, esp);
+
+ return stack;
+}
+
+/**
+ * Optimize an IncSp by replacing it with push/pop
+ */