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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_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 */
  82.