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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 "util/bitset.h"
  29. #include "brw_vec4.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.    BITSET_WORD flag_def[1];
  54.    BITSET_WORD flag_use[1];
  55.    BITSET_WORD flag_livein[1];
  56.    BITSET_WORD flag_liveout[1];
  57. };
  58.  
  59. class vec4_live_variables {
  60. public:
  61.    DECLARE_RALLOC_CXX_OPERATORS(vec4_live_variables)
  62.  
  63.    vec4_live_variables(const simple_allocator &alloc, cfg_t *cfg);
  64.    ~vec4_live_variables();
  65.  
  66.    int num_vars;
  67.    int bitset_words;
  68.  
  69.    /** Per-basic-block information on live variables */
  70.    struct block_data *block_data;
  71.  
  72. protected:
  73.    void setup_def_use();
  74.    void compute_live_variables();
  75.  
  76.    const simple_allocator &alloc;
  77.    cfg_t *cfg;
  78.    void *mem_ctx;
  79. };
  80.  
  81. inline unsigned
  82. var_from_reg(const simple_allocator &alloc, const src_reg &reg,
  83.              unsigned c = 0)
  84. {
  85.    assert(reg.file == GRF && reg.reg < alloc.count &&
  86.           reg.reg_offset < alloc.sizes[reg.reg] && c < 4);
  87.    return (4 * (alloc.offsets[reg.reg] + reg.reg_offset) +
  88.            BRW_GET_SWZ(reg.swizzle, c));
  89. }
  90.  
  91. inline unsigned
  92. var_from_reg(const simple_allocator &alloc, const dst_reg &reg,
  93.              unsigned c = 0)
  94. {
  95.    assert(reg.file == GRF && reg.reg < alloc.count &&
  96.           reg.reg_offset < alloc.sizes[reg.reg] && c < 4);
  97.    return 4 * (alloc.offsets[reg.reg] + reg.reg_offset) + c;
  98. }
  99.  
  100. } /* namespace brw */
  101.