src/mesa/drivers/dri/i965/brw_vec4_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_vec4.h"
  29
  30 namespace brw {
  31
  32 struct block_data {
  33    /**
  34     * Which variables are defined before being used in the block.
  35     *
  36     * Note that for our purposes, "defined" means unconditionally, completely
  37     * defined.
  38     */
  39    bool *def;
  40
  41    /**
  42     * Which variables are used before being defined in the block.
  43     */
  44    bool *use;
  45
  46    /** Which defs reach the entry point of the block. */
  47    bool *livein;
  48
  49    /** Which defs reach the exit point of the block. */
  50    bool *liveout;
  51 };
  52
  53 class vec4_live_variables {
  54 public:
  55    static void* operator new(size_t size, void *ctx)
  56    {
  57       void *node;
  58
  59       node = rzalloc_size(ctx, size);
  60       assert(node != NULL);
  61
  62       return node;
  63    }
  64
  65    vec4_live_variables(vec4_visitor *v, cfg_t *cfg);
  66    ~vec4_live_variables();
  67
  68    void setup_def_use();
  69    void compute_live_variables();
  70
  71    vec4_visitor *v;
  72    cfg_t *cfg;
  73    void *mem_ctx;
  74
  75    int num_vars;
  76
  77    /** Per-basic-block information on live variables */
  78    struct block_data *bd;
  79 };
  80
  81 } /* namespace brw */