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 /* Returns the variable index for the k-th dword of the c-th component of 82 * register reg. 83 */ 84 inline unsigned 85 var_from_reg(const simple_allocator &alloc, const src_reg ®, 86 unsigned c = 0, unsigned k = 0) 87 { 88 assert(reg.file == VGRF && reg.nr < alloc.count && c < 4); 89 const unsigned csize = DIV_ROUND_UP(type_sz(reg.type), 4); 90 unsigned result = 91 8 * (alloc.offsets[reg.nr] + reg.offset / REG_SIZE) + 92 (BRW_GET_SWZ(reg.swizzle, c) + k / csize * 4) * csize + k % csize; 93 /* Do not exceed the limit for this register */ 94 assert(result < 8 * (alloc.offsets[reg.nr] + alloc.sizes[reg.nr])); 95 return result; 96 } 97 98 inline unsigned 99 var_from_reg(const simple_allocator &alloc, const dst_reg ®, 100 unsigned c = 0, unsigned k = 0) 101 { 102 assert(reg.file == VGRF && reg.nr < alloc.count && c < 4); 103 const unsigned csize = DIV_ROUND_UP(type_sz(reg.type), 4); 104 unsigned result = 105 8 * (alloc.offsets[reg.nr] + reg.offset / REG_SIZE) + 106 (c + k / csize * 4) * csize + k % csize; 107 /* Do not exceed the limit for this register */ 108 assert(result < 8 * (alloc.offsets[reg.nr] + alloc.sizes[reg.nr])); 109 return result; 110 } 111 112 } /* namespace brw */ 113