src/mesa/drivers/dri/i965/brw_fs_live_variables.h

   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 "main/bitset.h"
  30
  31 namespace brw {
  32
  33 struct block_data {
  34    /**
  35     * Which variables are defined before being used in the block.
  36     *
  37     * Note that for our purposes, "defined" means unconditionally, completely
  38     * defined.
  39     */
  40    BITSET_WORD *def;
  41
  42    /**
  43     * Which variables are used before being defined in the block.
  44     */
  45    BITSET_WORD *use;
  46
  47    /** Which defs reach the entry point of the block. */
  48    BITSET_WORD *livein;
  49
  50    /** Which defs reach the exit point of the block. */
  51    BITSET_WORD *liveout;
  52 };
  53
  54 class fs_live_variables {
  55 public:
  56    DECLARE_RALLOC_CXX_OPERATORS(fs_live_variables)
  57
  58    fs_live_variables(fs_visitor *v, cfg_t *cfg);
  59    ~fs_live_variables();
  60
  61    void setup_def_use();
  62    void compute_live_variables();
  63
  64    fs_visitor *v;
  65    cfg_t *cfg;
  66    void *mem_ctx;
  67
  68    /** Map from virtual GRF number to index in block_data arrays. */
  69    int *var_from_vgrf;
  70
  71    /**
  72     * Map from any index in block_data to the virtual GRF containing it.
  73     *
  74     * For virtual_grf_sizes of [1, 2, 3], vgrf_from_var would contain
  75     * [0, 1, 1, 2, 2, 2].
  76     */
  77    int *vgrf_from_var;
  78
  79    int num_vars;
  80    int num_vgrfs;
  81    int bitset_words;
  82
  83    /** Per-basic-block information on live variables */
  84    struct block_data *bd;
  85 };
  86
  87 } /* namespace brw */