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/*
* Copyright © 2012 Intel Corporation
*
* 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 AUTHORS OR COPYRIGHT HOLDERS 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.
*
* Authors:
* Eric Anholt <eric@anholt.net>
*
*/
#ifndef BRW_FS_LIVE_VARIABLES_H
#define BRW_FS_LIVE_VARIABLES_H
#include "brw_fs.h"
#include "util/bitset.h"
struct cfg_t;
namespace brw {
struct block_data {
/**
* Which variables are defined before being used in the block.
*
* Note that for our purposes, "defined" means unconditionally, completely
* defined.
*/
BITSET_WORD *def;
/**
* Which variables are used before being defined in the block.
*/
BITSET_WORD *use;
/** Which defs reach the entry point of the block. */
BITSET_WORD *livein;
/** Which defs reach the exit point of the block. */
BITSET_WORD *liveout;
/**
* Variables such that the entry point of the block may be reached from any
* of their definitions.
*/
BITSET_WORD *defin;
/**
* Variables such that the exit point of the block may be reached from any
* of their definitions.
*/
BITSET_WORD *defout;
BITSET_WORD flag_def[1];
BITSET_WORD flag_use[1];
BITSET_WORD flag_livein[1];
BITSET_WORD flag_liveout[1];
};
class fs_live_variables {
public:
DECLARE_RALLOC_CXX_OPERATORS(fs_live_variables)
fs_live_variables(fs_visitor *v, const cfg_t *cfg);
~fs_live_variables();
bool vars_interfere(int a, int b);
int var_from_reg(const fs_reg ®) const
{
return var_from_vgrf[reg.nr] + reg.offset / REG_SIZE;
}
/** Map from virtual GRF number to index in block_data arrays. */
int *var_from_vgrf;
/**
* Map from any index in block_data to the virtual GRF containing it.
*
* For alloc.sizes of [1, 2, 3], vgrf_from_var would contain
* [0, 1, 1, 2, 2, 2].
*/
int *vgrf_from_var;
int num_vars;
int num_vgrfs;
int bitset_words;
/** @{
* Final computed live ranges for each var (each component of each virtual
* GRF).
*/
int *start;
int *end;
/** @} */
/** Per-basic-block information on live variables */
struct block_data *block_data;
protected:
void setup_def_use();
void setup_one_read(struct block_data *bd, fs_inst *inst, int ip,
const fs_reg ®);
void setup_one_write(struct block_data *bd, fs_inst *inst, int ip,
const fs_reg ®);
void compute_live_variables();
void compute_start_end();
fs_visitor *v;
const cfg_t *cfg;
void *mem_ctx;
};
} /* namespace brw */
#endif /* BRW_FS_LIVE_VARIABLES_H */
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