1 /* 2 * Copyright © 2014 Connor Abbott 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 24 #ifndef NIR_SCHEDULE_H 25 #define NIR_SCHEDULE_H 26 27 #include "nir.h" 28 29 #ifdef __cplusplus 30 extern "C" { 31 #endif 32 33 /** 34 * Struct filled in by the intrinsic_cb callback of nir_schedule_options to 35 * specify a backend-specific dependency on an intrinsic. 36 */ 37 typedef struct nir_schedule_dependency { 38 /* Which class of dependency this is. The meanings of the classes are 39 * specific to the backend. This must be less than 40 * NIR_SCHEDULE_N_DEPENDENCY_CLASSES. 41 */ 42 int klass; 43 /* The type of dependency */ 44 enum { 45 NIR_SCHEDULE_READ_DEPENDENCY, 46 NIR_SCHEDULE_WRITE_DEPENDENCY, 47 } type; 48 } nir_schedule_dependency; 49 50 typedef struct nir_schedule_options { 51 /* On some hardware with some stages the inputs and outputs to the shader 52 * share the same memory. In that case the scheduler needs to ensure that 53 * all output writes are scheduled after all of the input writes to avoid 54 * overwriting them. This is a bitmask of stages that need that. 55 */ 56 unsigned stages_with_shared_io_memory; 57 /* The approximate amount of register pressure at which point the scheduler 58 * will try to reduce register usage. 59 */ 60 int threshold; 61 /* If set, instead of trying to optimise parallelism, the scheduler will try 62 * to always minimise register pressure. This can be used as a fallback when 63 * register allocation fails so that it can at least try to generate a 64 * working shader even if it’s inefficient. 65 */ 66 bool fallback; 67 /* Callback used to add custom dependencies on intrinsics. If it returns 68 * true then a dependency should be added and dep is filled in to describe 69 * it. 70 */ 71 bool (* intrinsic_cb)(nir_intrinsic_instr *intr, 72 nir_schedule_dependency *dep, 73 void *user_data); 74 /* Data to pass to the callback */ 75 void *intrinsic_cb_data; 76 } nir_schedule_options; 77 78 void nir_schedule(nir_shader *shader, const nir_schedule_options *options); 79 80 #ifdef __cplusplus 81 } /* extern "C" */ 82 #endif 83 84 #endif /* NIR_SCHEDULE_H */ 85