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  1. /*
  2.  * Copyright © 2012 Intel Corporation
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the "Software"),
  6.  * to deal in the Software without restriction, including without limitation
  7.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8.  * and/or sell copies of the Software, and to permit persons to whom the
  9.  * Software is furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice (including the next
  12.  * paragraph) shall be included in all copies or substantial portions of the
  13.  * Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21.  * IN THE SOFTWARE.
  22.  *
  23.  * Authors:
  24.  *    Eric Anholt <eric@anholt.net>
  25.  *
  26.  */
  27.  
  28. #include "brw_fs.h"
  29. #include "util/bitset.h"
  30.  
  31. struct cfg_t;
  32.  
  33. namespace brw {
  34.  
  35. struct block_data {
  36.    /**
  37.     * Which variables are defined before being used in the block.
  38.     *
  39.     * Note that for our purposes, "defined" means unconditionally, completely
  40.     * defined.
  41.     */
  42.    BITSET_WORD *def;
  43.  
  44.    /**
  45.     * Which variables are used before being defined in the block.
  46.     */
  47.    BITSET_WORD *use;
  48.  
  49.    /** Which defs reach the entry point of the block. */
  50.    BITSET_WORD *livein;
  51.  
  52.    /** Which defs reach the exit point of the block. */
  53.    BITSET_WORD *liveout;
  54.  
  55.    BITSET_WORD flag_def[1];
  56.    BITSET_WORD flag_use[1];
  57.    BITSET_WORD flag_livein[1];
  58.    BITSET_WORD flag_liveout[1];
  59. };
  60.  
  61. class fs_live_variables {
  62. public:
  63.    DECLARE_RALLOC_CXX_OPERATORS(fs_live_variables)
  64.  
  65.    fs_live_variables(fs_visitor *v, const cfg_t *cfg);
  66.    ~fs_live_variables();
  67.  
  68.    bool vars_interfere(int a, int b);
  69.    int var_from_reg(const fs_reg &reg) const
  70.    {
  71.       return var_from_vgrf[reg.reg] + reg.reg_offset;
  72.    }
  73.  
  74.    /** Map from virtual GRF number to index in block_data arrays. */
  75.    int *var_from_vgrf;
  76.  
  77.    /**
  78.     * Map from any index in block_data to the virtual GRF containing it.
  79.     *
  80.     * For alloc.sizes of [1, 2, 3], vgrf_from_var would contain
  81.     * [0, 1, 1, 2, 2, 2].
  82.     */
  83.    int *vgrf_from_var;
  84.  
  85.    int num_vars;
  86.    int num_vgrfs;
  87.    int bitset_words;
  88.  
  89.    /** @{
  90.     * Final computed live ranges for each var (each component of each virtual
  91.     * GRF).
  92.     */
  93.    int *start;
  94.    int *end;
  95.    /** @} */
  96.  
  97.    /** Per-basic-block information on live variables */
  98.    struct block_data *block_data;
  99.  
  100. protected:
  101.    void setup_def_use();
  102.    void setup_one_read(struct block_data *bd, fs_inst *inst, int ip,
  103.                        const fs_reg &reg);
  104.    void setup_one_write(struct block_data *bd, fs_inst *inst, int ip,
  105.                         const fs_reg &reg);
  106.    void compute_live_variables();
  107.    void compute_start_end();
  108.  
  109.    fs_visitor *v;
  110.    const cfg_t *cfg;
  111.    void *mem_ctx;
  112.  
  113. };
  114.  
  115. } /* namespace brw */
  116.