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); var_from_reg(const fs_reg & reg)69 int var_from_reg(const fs_reg ®) const 70 { 71 return var_from_vgrf[reg.nr] + reg.offset / REG_SIZE; 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 ®); 104 void setup_one_write(struct block_data *bd, fs_inst *inst, int ip, 105 const fs_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