benode.c 41.1 KB
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/*
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 * Copyright (C) 1995-2008 University of Karlsruhe.  All right reserved.
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 *
 * This file is part of libFirm.
 *
 * This file may be distributed and/or modified under the terms of the
 * GNU General Public License version 2 as published by the Free Software
 * Foundation and appearing in the file LICENSE.GPL included in the
 * packaging of this file.
 *
 * Licensees holding valid libFirm Professional Edition licenses may use
 * this file in accordance with the libFirm Commercial License.
 * Agreement provided with the Software.
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE.
 */

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/**
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 * @file
 * @brief       Backend node support for generic backend nodes.
 * @author      Sebastian Hack
 * @date        17.05.2005
 * @version     $Id$
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 *
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 * Backend node support for generic backend nodes.
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 * This file provides Perm, Copy, Spill and Reload nodes.
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 */
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#include "config.h"
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#include <stdlib.h>

#include "obst.h"
#include "set.h"
#include "pmap.h"
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#include "util.h"
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#include "debug.h"
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#include "fourcc.h"
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#include "bitfiddle.h"
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#include "raw_bitset.h"
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#include "error.h"
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#include "array_t.h"
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#include "irop_t.h"
#include "irmode_t.h"
#include "irnode_t.h"
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#include "ircons_t.h"
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#include "irprintf.h"
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#include "irgwalk.h"
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#include "iropt_t.h"
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#include "be_t.h"
#include "belive_t.h"
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#include "besched.h"
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#include "benode.h"
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#include "bearch.h"
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#include "beirgmod.h"

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#define get_irn_attr(irn) get_irn_generic_attr(irn)
#define get_irn_attr_const(irn) get_irn_generic_attr_const(irn)
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typedef struct {
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	const arch_register_req_t *in_req;
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} be_reg_data_t;

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/** The generic be nodes attribute type. */
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typedef struct {
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	be_reg_data_t *reg_data;
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} be_node_attr_t;

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/** The be_Return nodes attribute type. */
typedef struct {
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	be_node_attr_t node_attr;     /**< base attributes of every be node. */
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	int            num_ret_vals;  /**< number of return values */
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	unsigned       pop;           /**< number of bytes that should be popped */
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	int            emit_pop;      /**< if set, emit pop bytes, even if pop = 0 */
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} be_return_attr_t;

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/** The be_IncSP attribute type. */
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typedef struct {
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	be_node_attr_t node_attr;   /**< base attributes of every be node. */
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	int            offset;      /**< The offset by which the stack shall be expanded/shrinked. */
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	int            align;       /**< whether stack should be aligned after the
	                                 IncSP */
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} be_incsp_attr_t;
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/** The be_Frame attribute type. */
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typedef struct {
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	be_node_attr_t  node_attr;   /**< base attributes of every be node. */
	ir_entity      *ent;
	int             offset;
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} be_frame_attr_t;

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/** The be_Call attribute type. */
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typedef struct {
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	be_node_attr_t  node_attr;  /**< base attributes of every be node. */
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	ir_entity      *ent;        /**< The called entity if this is a static call. */
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	unsigned        pop;
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	ir_type        *call_tp;    /**< The call type, copied from the original Call node. */
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} be_call_attr_t;

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typedef struct {
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	be_node_attr_t   node_attr;  /**< base attributes of every be node. */
	ir_entity      **in_entities;
	ir_entity      **out_entities;
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} be_memperm_attr_t;
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ir_op *op_be_Spill;
ir_op *op_be_Reload;
ir_op *op_be_Perm;
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ir_op *op_be_MemPerm;
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ir_op *op_be_Copy;
ir_op *op_be_Keep;
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ir_op *op_be_CopyKeep;
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ir_op *op_be_Call;
ir_op *op_be_Return;
ir_op *op_be_IncSP;
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ir_op *op_be_AddSP;
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ir_op *op_be_SubSP;
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ir_op *op_be_Start;
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ir_op *op_be_FrameAddr;
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ir_op *op_be_Barrier;
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static const ir_op_ops be_node_op_ops;
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#define N   irop_flag_none
#define L   irop_flag_labeled
#define C   irop_flag_commutative
#define X   irop_flag_cfopcode
#define I   irop_flag_ip_cfopcode
#define F   irop_flag_fragile
#define Y   irop_flag_forking
#define H   irop_flag_highlevel
#define c   irop_flag_constlike
#define K   irop_flag_keep
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#define M   irop_flag_uses_memory
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/**
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 * Compare two be node attributes.
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 *
 * @return zero if both attributes are identically
 */
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static int node_cmp_attr(ir_node *a, ir_node *b)
{
	const be_node_attr_t *a_attr = get_irn_attr_const(a);
	const be_node_attr_t *b_attr = get_irn_attr_const(b);
	int i, len = ARR_LEN(a_attr->reg_data);
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	if (len != ARR_LEN(b_attr->reg_data))
		return 1;

	if (!be_nodes_equal(a, b))
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		return 1;
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	for (i = len - 1; i >= 0; --i) {
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		if (!reg_reqs_equal(a_attr->reg_data[i].in_req,
		                    b_attr->reg_data[i].in_req))
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			return 1;
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	}
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	return 0;
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}

/**
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 * Compare the attributes of two be_FrameAddr nodes.
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 *
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 * @return zero if both nodes have identically attributes
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 */
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static int FrameAddr_cmp_attr(ir_node *a, ir_node *b)
{
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	const be_frame_attr_t *a_attr = get_irn_attr_const(a);
	const be_frame_attr_t *b_attr = get_irn_attr_const(b);
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	if (a_attr->ent != b_attr->ent || a_attr->offset != b_attr->offset)
		return 1;

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	return node_cmp_attr(a, b);
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}

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/**
 * Compare the attributes of two be_Return nodes.
 *
 * @return zero if both nodes have identically attributes
 */
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static int Return_cmp_attr(ir_node *a, ir_node *b)
{
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	const be_return_attr_t *a_attr = get_irn_attr_const(a);
	const be_return_attr_t *b_attr = get_irn_attr_const(b);
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	if (a_attr->num_ret_vals != b_attr->num_ret_vals)
		return 1;
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	if (a_attr->pop != b_attr->pop)
		return 1;
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	if (a_attr->emit_pop != b_attr->emit_pop)
		return 1;
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	return node_cmp_attr(a, b);
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}

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/**
 * Compare the attributes of two be_IncSP nodes.
 *
 * @return zero if both nodes have identically attributes
 */
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static int IncSP_cmp_attr(ir_node *a, ir_node *b)
{
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	const be_incsp_attr_t *a_attr = get_irn_attr_const(a);
	const be_incsp_attr_t *b_attr = get_irn_attr_const(b);
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	if (a_attr->offset != b_attr->offset)
		return 1;

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	return node_cmp_attr(a, b);
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}

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/**
 * Compare the attributes of two be_Call nodes.
 *
 * @return zero if both nodes have identically attributes
 */
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static int Call_cmp_attr(ir_node *a, ir_node *b)
{
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	const be_call_attr_t *a_attr = get_irn_attr_const(a);
	const be_call_attr_t *b_attr = get_irn_attr_const(b);
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	if (a_attr->ent != b_attr->ent ||
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		a_attr->call_tp != b_attr->call_tp)
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		return 1;

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	return node_cmp_attr(a, b);
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}

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static arch_register_req_t *allocate_reg_req(const ir_node *node)
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{
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	ir_graph       *irg  = get_irn_irg(node);
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	struct obstack *obst = be_get_be_obst(irg);
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	arch_register_req_t *req = obstack_alloc(obst, sizeof(*req));
	memset(req, 0, sizeof(*req));
	return req;
}
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void be_set_constr_in(ir_node *node, int pos, const arch_register_req_t *req)
{
	const be_node_attr_t *attr = get_irn_attr_const(node);
	be_reg_data_t *rd = &attr->reg_data[pos];
	assert(pos < ARR_LEN(attr->reg_data));
	rd->in_req = req;
}
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void be_set_constr_out(ir_node *node, int pos, const arch_register_req_t *req)
{
	backend_info_t *info = be_get_info(node);
	info->out_infos[pos].req = req;
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}

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/**
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 * Initializes the generic attribute of all be nodes and return it.
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 */
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static void *init_node_attr(ir_node *node, int n_inputs, int n_outputs)
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{
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	ir_graph       *irg  = get_irn_irg(node);
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	struct obstack *obst = be_get_be_obst(irg);
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	be_node_attr_t *a    = get_irn_attr(node);
	backend_info_t *info = be_get_info(node);
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	memset(a, 0, sizeof(get_op_attr_size(get_irn_op(node))));
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	if (n_inputs >= 0) {
		int i;
		a->reg_data = NEW_ARR_D(be_reg_data_t, obst, n_inputs);
		for (i = 0; i < n_inputs; ++i) {
			a->reg_data[i].in_req = arch_no_register_req;
		}
	} else {
		a->reg_data = NEW_ARR_F(be_reg_data_t, 0);
	}
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	if (n_outputs >= 0) {
		int i;
		info->out_infos = NEW_ARR_D(reg_out_info_t, obst, n_outputs);
		memset(info->out_infos, 0, n_outputs * sizeof(info->out_infos[0]));
		for (i = 0; i < n_outputs; ++i) {
			info->out_infos[i].req = arch_no_register_req;
		}
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	} else {
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		info->out_infos = NEW_ARR_F(reg_out_info_t, 0);
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	}

	return a;
}
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static void add_register_req_out(ir_node *node)
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{
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	backend_info_t *info = be_get_info(node);
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	reg_out_info_t  out_info;
	memset(&out_info, 0, sizeof(out_info));
	out_info.req = arch_no_register_req;
	ARR_APP1(reg_out_info_t, info->out_infos, out_info);
}

static void add_register_req_in(ir_node *node)
{
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	be_node_attr_t *a    = get_irn_attr(node);
	be_reg_data_t   regreq;
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	memset(&regreq, 0, sizeof(regreq));
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	regreq.in_req = arch_no_register_req;
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	ARR_APP1(be_reg_data_t, a->reg_data, regreq);
}

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ir_node *be_new_Spill(const arch_register_class_t *cls,
		const arch_register_class_t *cls_frame, ir_node *bl,
		ir_node *frame, ir_node *to_spill)
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{
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	be_frame_attr_t *a;
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	ir_node         *in[2];
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	ir_node         *res;
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	ir_graph        *irg = get_Block_irg(bl);
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	in[0]     = frame;
	in[1]     = to_spill;
	res       = new_ir_node(NULL, irg, bl, op_be_Spill, mode_M, 2, in);
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	a         = init_node_attr(res, 2, 1);
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	a->ent    = NULL;
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	a->offset = 0;
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	be_node_set_reg_class_in(res, be_pos_Spill_frame, cls_frame);
	be_node_set_reg_class_in(res, be_pos_Spill_val, cls);
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	/*
	 * For spills and reloads, we return "none" as requirement for frame
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	 * pointer, so every input is ok. Some backends need this (STA).
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	 * Matze: we should investigate if this is really needed, this solution
	 *        looks very hacky to me
	 */
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	be_set_constr_in(res, be_pos_Spill_frame, arch_no_register_req);
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	arch_set_out_register_req(res, 0, arch_no_register_req);

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	return res;
}
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ir_node *be_new_Reload(const arch_register_class_t *cls,
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		const arch_register_class_t *cls_frame, ir_node *block,
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		ir_node *frame, ir_node *mem, ir_mode *mode)
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{
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	ir_node  *in[2];
	ir_node  *res;
	ir_graph *irg = get_Block_irg(block);
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	in[0] = frame;
	in[1] = mem;
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	res   = new_ir_node(NULL, irg, block, op_be_Reload, mode, 2, in);
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	init_node_attr(res, 2, 1);
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	be_node_set_reg_class_out(res, 0, cls);
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	be_node_set_reg_class_in(res, be_pos_Reload_frame, cls_frame);
	arch_irn_set_flags(res, arch_irn_flags_rematerializable);
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	/*
	 * For spills and reloads, we return "none" as requirement for frame
	 * pointer, so every input is ok. Some backends need this (e.g. STA).
	 * Matze: we should investigate if this is really needed, this solution
	 *        looks very hacky to me
	 */
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	be_set_constr_in(res, be_pos_Reload_frame, arch_no_register_req);
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	return res;
}
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ir_node *be_get_Reload_mem(const ir_node *irn)
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{
	assert(be_is_Reload(irn));
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	return get_irn_n(irn, be_pos_Reload_mem);
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}

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ir_node *be_get_Reload_frame(const ir_node *irn)
{
	assert(be_is_Reload(irn));
	return get_irn_n(irn, be_pos_Reload_frame);
}

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ir_node *be_get_Spill_val(const ir_node *irn)
{
	assert(be_is_Spill(irn));
	return get_irn_n(irn, be_pos_Spill_val);
}
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ir_node *be_get_Spill_frame(const ir_node *irn)
{
	assert(be_is_Spill(irn));
	return get_irn_n(irn, be_pos_Spill_frame);
}
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ir_node *be_new_Perm(const arch_register_class_t *cls, ir_node *block,
                     int n, ir_node *in[])
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{
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	int      i;
	ir_graph *irg = get_Block_irg(block);

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	ir_node *irn = new_ir_node(NULL, irg, block, op_be_Perm, mode_T, n, in);
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	init_node_attr(irn, n, n);
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	for (i = 0; i < n; ++i) {
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		be_node_set_reg_class_in(irn, i, cls);
		be_node_set_reg_class_out(irn, i, cls);
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	}

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	return irn;
}
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void be_Perm_reduce(ir_node *perm, int new_size, int *map)
{
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	int            arity      = get_irn_arity(perm);
	be_reg_data_t  *old_data  = ALLOCAN(be_reg_data_t, arity);
	reg_out_info_t *old_infos = ALLOCAN(reg_out_info_t, arity);
	be_node_attr_t *attr      = get_irn_attr(perm);
	backend_info_t *info      = be_get_info(perm);
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	ir_node        **new_in;
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	int i;

	assert(be_is_Perm(perm));
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	assert(new_size <= arity);
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	new_in = alloca(new_size * sizeof(*new_in));
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	/* save the old register data */
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	memcpy(old_data, attr->reg_data, arity * sizeof(old_data[0]));
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	memcpy(old_infos, info->out_infos, arity * sizeof(old_infos[0]));
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	/* compose the new in array and set the new register data directly in place */
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	for (i = 0; i < new_size; ++i) {
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		int idx = map[i];
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		new_in[i]          = get_irn_n(perm, idx);
		attr->reg_data[i]  = old_data[idx];
		info->out_infos[i] = old_infos[idx];
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	}

	set_irn_in(perm, new_size, new_in);
}

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ir_node *be_new_MemPerm(const arch_env_t *arch_env, ir_node *bl, int n, ir_node *in[])
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{
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	ir_graph                     *irg       = get_Block_irg(bl);
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	ir_node                      *frame     = get_irg_frame(irg);
	const arch_register_t        *sp        = arch_env->sp;
	ir_node                      *irn;
	be_memperm_attr_t            *attr;
	ir_node                     **real_in;
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	real_in = ALLOCAN(ir_node*, n + 1);
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	real_in[0] = frame;
	memcpy(&real_in[1], in, n * sizeof(real_in[0]));

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	irn = new_ir_node(NULL, irg, bl, op_be_MemPerm, mode_T, n+1, real_in);
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	init_node_attr(irn, n + 1, n);
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	be_node_set_reg_class_in(irn, 0, sp->reg_class);
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	attr               = get_irn_attr(irn);
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	attr->in_entities  = OALLOCNZ(irg->obst, ir_entity*, n);
	attr->out_entities = OALLOCNZ(irg->obst, ir_entity*, n);
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	return irn;
}

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ir_node *be_new_Copy(const arch_register_class_t *cls, ir_node *bl, ir_node *op)
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{
	ir_node *in[1];
	ir_node *res;
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	arch_register_req_t *req;
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	ir_graph *irg = get_Block_irg(bl);
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	in[0] = op;
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	res   = new_ir_node(NULL, irg, bl, op_be_Copy, get_irn_mode(op), 1, in);
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	init_node_attr(res, 1, 1);
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	be_node_set_reg_class_in(res, 0, cls);
	be_node_set_reg_class_out(res, 0, cls);
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	req = allocate_reg_req(res);
	req->cls        = cls;
	req->type       = arch_register_req_type_should_be_same;
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	req->other_same = 1U << 0;
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	be_set_constr_out(res, 0, req);
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	return res;
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}

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ir_node *be_get_Copy_op(const ir_node *cpy)
{
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	return get_irn_n(cpy, be_pos_Copy_op);
}

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void be_set_Copy_op(ir_node *cpy, ir_node *op)
{
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	set_irn_n(cpy, be_pos_Copy_op, op);
}

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ir_node *be_new_Keep(ir_node *block, int n, ir_node *in[])
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{
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	int i;
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	ir_node *res;
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	ir_graph *irg = get_Block_irg(block);
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	res = new_ir_node(NULL, irg, block, op_be_Keep, mode_ANY, -1, NULL);
	init_node_attr(res, -1, 1);
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	for (i = 0; i < n; ++i) {
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		add_irn_n(res, in[i]);
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		add_register_req_in(res);
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	}
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	keep_alive(res);

	return res;
}

void be_Keep_add_node(ir_node *keep, const arch_register_class_t *cls, ir_node *node)
{
	int n;

	assert(be_is_Keep(keep));
	n = add_irn_n(keep, node);
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	add_register_req_in(keep);
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	be_node_set_reg_class_in(keep, n, cls);
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}

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/* creates a be_Call */
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ir_node *be_new_Call(dbg_info *dbg, ir_graph *irg, ir_node *bl, ir_node *mem,
		ir_node *sp, ir_node *ptr, int n_outs, int n, ir_node *in[],
		ir_type *call_tp)
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{
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	be_call_attr_t *a;
	int real_n = be_pos_Call_first_arg + n;
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	ir_node *irn;
	ir_node **real_in;
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	NEW_ARR_A(ir_node *, real_in, real_n);
	real_in[be_pos_Call_mem] = mem;
	real_in[be_pos_Call_sp]  = sp;
	real_in[be_pos_Call_ptr] = ptr;
	memcpy(&real_in[be_pos_Call_first_arg], in, n * sizeof(in[0]));
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	irn = new_ir_node(dbg, irg, bl, op_be_Call, mode_T, real_n, real_in);
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	a = init_node_attr(irn, real_n, n_outs);
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	a->ent     = NULL;
	a->call_tp = call_tp;
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	a->pop     = 0;
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	return irn;
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}

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/* Gets the call entity or NULL if this is no static call. */
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ir_entity *be_Call_get_entity(const ir_node *call)
{
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	const be_call_attr_t *a = get_irn_attr_const(call);
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	assert(be_is_Call(call));
	return a->ent;
}

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/* Sets the call entity. */
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void be_Call_set_entity(ir_node *call, ir_entity *ent)
{
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	be_call_attr_t *a = get_irn_attr(call);
	assert(be_is_Call(call));
	a->ent = ent;
}

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/* Gets the call type. */
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ir_type *be_Call_get_type(ir_node *call)
{
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	const be_call_attr_t *a = get_irn_attr_const(call);
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	assert(be_is_Call(call));
	return a->call_tp;
}

/* Sets the call type. */
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void be_Call_set_type(ir_node *call, ir_type *call_tp)
{
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	be_call_attr_t *a = get_irn_attr(call);
	assert(be_is_Call(call));
	a->call_tp = call_tp;
}

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void be_Call_set_pop(ir_node *call, unsigned pop)
{
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	be_call_attr_t *a = get_irn_attr(call);
	a->pop = pop;
}

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unsigned be_Call_get_pop(const ir_node *call)
{
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	const be_call_attr_t *a = get_irn_attr_const(call);
	return a->pop;
}

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/* Construct a new be_Return. */
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ir_node *be_new_Return(dbg_info *dbg, ir_graph *irg, ir_node *block, int n_res,
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                       unsigned pop, int n, ir_node *in[])
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{
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	be_return_attr_t *a;
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	ir_node *res;
	int i;

	res = new_ir_node(dbg, irg, block, op_be_Return, mode_X, -1, NULL);
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	init_node_attr(res, -1, 1);
	for (i = 0; i < n; ++i) {
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		add_irn_n(res, in[i]);
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		add_register_req_in(res);
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	}
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	be_set_constr_out(res, 0, arch_no_register_req);
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	a = get_irn_attr(res);
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	a->num_ret_vals = n_res;
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	a->pop          = pop;
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	a->emit_pop     = 0;
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	return res;
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}

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/* Returns the number of real returns values */
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int be_Return_get_n_rets(const ir_node *ret)
{
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	const be_return_attr_t *a = get_irn_generic_attr_const(ret);
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	return a->num_ret_vals;
}

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/* return the number of bytes that should be popped from stack when executing the Return. */
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unsigned be_Return_get_pop(const ir_node *ret)
{
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	const be_return_attr_t *a = get_irn_generic_attr_const(ret);
	return a->pop;
}

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/* return non-zero, if number of popped bytes must be always emitted */
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int be_Return_get_emit_pop(const ir_node *ret)
{
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	const be_return_attr_t *a = get_irn_generic_attr_const(ret);
	return a->emit_pop;
}

/* return non-zero, if number of popped bytes must be always emitted */
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void be_Return_set_emit_pop(ir_node *ret, int emit_pop)
{
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	be_return_attr_t *a = get_irn_generic_attr(ret);
	a->emit_pop = emit_pop;
}

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int be_Return_append_node(ir_node *ret, ir_node *node)
{
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	int pos;

	pos = add_irn_n(ret, node);
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	add_register_req_in(ret);
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	return pos;
}

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ir_node *be_new_IncSP(const arch_register_t *sp, ir_node *bl,
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                      ir_node *old_sp, int offset, int align)
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{
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	be_incsp_attr_t *a;
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	ir_node *irn;
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	ir_node *in[1];
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	ir_graph *irg = get_Block_irg(bl);
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	in[0]     = old_sp;
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	irn       = new_ir_node(NULL, irg, bl, op_be_IncSP, sp->reg_class->mode,
	                        sizeof(in) / sizeof(in[0]), in);
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	a         = init_node_attr(irn, 1, 1);
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	a->offset = offset;
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	a->align  = align;
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	/* Set output constraint to stack register. */
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	be_node_set_reg_class_in(irn, 0, sp->reg_class);
	be_set_constr_single_reg_out(irn, 0, sp, arch_register_req_type_produces_sp);
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	return irn;
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}
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ir_node *be_new_AddSP(const arch_register_t *sp, ir_node *bl, ir_node *old_sp,
		ir_node *sz)
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{
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	be_node_attr_t *a;
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	ir_node *irn;
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	ir_node *in[be_pos_AddSP_last];
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	const arch_register_class_t *cls;
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	ir_graph *irg;
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	in[be_pos_AddSP_old_sp] = old_sp;
	in[be_pos_AddSP_size]   = sz;
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	irg = get_Block_irg(bl);
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	irn = new_ir_node(NULL, irg, bl, op_be_AddSP, mode_T, be_pos_AddSP_last, in);
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	a   = init_node_attr(irn, be_pos_AddSP_last, pn_be_AddSP_last);
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	/* Set output constraint to stack register. */
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	be_set_constr_single_reg_in(irn, be_pos_AddSP_old_sp, sp, 0);
	be_node_set_reg_class_in(irn, be_pos_AddSP_size, arch_register_get_class(sp));
	be_set_constr_single_reg_out(irn, pn_be_AddSP_sp, sp, arch_register_req_type_produces_sp);
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	cls = arch_register_get_class(sp);
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	return irn;
}

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ir_node *be_new_SubSP(const arch_register_t *sp, ir_node *bl, ir_node *old_sp, ir_node *sz)
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{
	be_node_attr_t *a;
	ir_node *irn;
	ir_node *in[be_pos_SubSP_last];
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	ir_graph *irg;
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	in[be_pos_SubSP_old_sp] = old_sp;
	in[be_pos_SubSP_size]   = sz;

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	irg = get_Block_irg(bl);
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	irn = new_ir_node(NULL, irg, bl, op_be_SubSP, mode_T, be_pos_SubSP_last, in);
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	a   = init_node_attr(irn, be_pos_SubSP_last, pn_be_SubSP_last);
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	/* Set output constraint to stack register. */
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	be_set_constr_single_reg_in(irn, be_pos_SubSP_old_sp, sp, 0);
	be_node_set_reg_class_in(irn, be_pos_SubSP_size, arch_register_get_class(sp));
	be_set_constr_single_reg_out(irn, pn_be_SubSP_sp, sp, arch_register_req_type_produces_sp);
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	return irn;
}

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ir_node *be_new_Start(dbg_info *dbgi, ir_node *bl, int n_outs)
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{
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	ir_node *res;
	int i;
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	ir_graph *irg = get_Block_irg(bl);
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	res = new_ir_node(dbgi, irg, bl, op_be_Start, mode_T, 0, NULL);
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	init_node_attr(res, 0, -1);
	for (i = 0; i < n_outs; ++i) {
		add_register_req_out(res);
	}
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	return res;
}

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ir_node *be_new_FrameAddr(const arch_register_class_t *cls_frame, ir_node *bl, ir_node *frame, ir_entity *ent)
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{
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	be_frame_attr_t *a;
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	ir_node *irn;
	ir_node *in[1];
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	ir_graph *irg = get_Block_irg(bl);
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	in[0]  = frame;
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	irn    = new_ir_node(NULL, irg, bl, op_be_FrameAddr, get_irn_mode(frame), 1, in);
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	a      = init_node_attr(irn, 1, 1);
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	a->ent = ent;
	a->offset = 0;
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	be_node_set_reg_class_in(irn, 0, cls_frame);
	be_node_set_reg_class_out(irn, 0, cls_frame);
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	return optimize_node(irn);
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}

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ir_node *be_get_FrameAddr_frame(const ir_node *node)
{
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	assert(be_is_FrameAddr(node));
	return get_irn_n(node, be_pos_FrameAddr_ptr);
}

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ir_entity *be_get_FrameAddr_entity(const ir_node *node)
{
	const be_frame_attr_t *attr = get_irn_generic_attr_const(node);
	return attr->ent;
}

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ir_node *be_new_CopyKeep(const arch_register_class_t *cls, ir_node *bl, ir_node *src, int n, ir_node *in_keep[], ir_mode *mode)
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{
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	ir_node  *irn;
	ir_node **in = ALLOCAN(ir_node*, n + 1);
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	ir_graph *irg = get_Block_irg(bl);
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	in[0] = src;
	memcpy(&in[1], in_keep, n * sizeof(in[0]));
	irn   = new_ir_node(NULL, irg, bl, op_be_CopyKeep, mode, n + 1, in);
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	init_node_attr(irn, n + 1, 1);
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	be_node_set_reg_class_in(irn, 0, cls);
	be_node_set_reg_class_out(irn, 0, cls);
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	return irn;
}

790
ir_node *be_new_CopyKeep_single(const arch_register_class_t *cls, ir_node *bl, ir_node *src, ir_node *keep, ir_mode *mode)
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{
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	return be_new_CopyKeep(cls, bl, src, 1, &keep, mode);
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}

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ir_node *be_get_CopyKeep_op(const ir_node *cpy)
{
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	return get_irn_n(cpy, be_pos_CopyKeep_op);
}

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void be_set_CopyKeep_op(ir_node *cpy, ir_node *op)
{
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	set_irn_n(cpy, be_pos_CopyKeep_op, op);
}

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ir_node *be_new_Barrier(ir_node *bl, int n, ir_node *in[])
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{
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	ir_node *res;
	int i;
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	ir_graph *irg = get_Block_irg(bl);
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	res = new_ir_node(NULL, irg, bl, op_be_Barrier, mode_T, -1, NULL);
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	init_node_attr(res, -1, -1);
	for (i = 0; i < n; ++i) {
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		add_irn_n(res, in[i]);
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		add_register_req_in(res);
		add_register_req_out(res);
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	}

	return res;
}

ir_node *be_Barrier_append_node(ir_node *barrier, ir_node *node)
{
	ir_mode *mode = get_irn_mode(node);
	int n = add_irn_n(barrier, node);
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	ir_node *proj = new_r_Proj(barrier, mode, n);
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	add_register_req_in(barrier);
	add_register_req_out(barrier);
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	return proj;
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}

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static bool be_has_frame_entity(const ir_node *irn)
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{
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	switch (get_irn_opcode(irn)) {
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	case beo_Spill:
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	case beo_Reload:
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	case beo_FrameAddr:
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		return true;
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	default:
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		return false;
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