/*
 * Copyright 2011 Tom Stellard <tstellar@gmail.com>
 *
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#ifndef RADEON_VARIABLE_H
#define RADEON_VARIABLE_H

#include "radeon_compiler.h"

struct radeon_compiler;
struct rc_list;
struct rc_reader_data;
struct rc_readers;

struct live_intervals {
	int Start;
	int End;
	int Used;
};

struct rc_variable {
	struct radeon_compiler * C;
	struct rc_dst_register Dst;

	struct rc_instruction * Inst;
	unsigned int ReaderCount;
	struct rc_reader * Readers;
	struct live_intervals Live[4];

	/* A friend is a variable that shares a reader with another variable.
	 */
	struct rc_variable * Friend;
};

void rc_variable_change_dst(
	struct rc_variable * var,
	unsigned int new_index,
	unsigned int new_writemask);

void rc_variable_compute_live_intervals(struct rc_variable * var);

void rc_variable_add_friend(
	struct rc_variable * var,
	struct rc_variable * friend);

struct rc_variable * rc_variable(
	struct radeon_compiler * c,
	unsigned int DstFile,
	unsigned int DstIndex,
	unsigned int DstWriteMask,
	struct rc_reader_data * reader_data);

struct rc_list * rc_get_variables(struct radeon_compiler * c);

unsigned int rc_variable_writemask_sum(struct rc_variable * var);

struct rc_list * rc_variable_readers_union(struct rc_variable * var);

struct rc_list * rc_variable_list_get_writers(
	struct rc_list * var_list,
	unsigned int src_type,
	void * src);

void rc_variable_print(struct rc_variable * var);

#endif /* RADEON_VARIABLE_H */
