1 /* 2 * Copyright © 2017 Gert Wollny 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 21 * DEALINGS IN THE SOFTWARE. 22 */ 23 24 #ifndef MESA_GLSL_TO_TGSI_TEMPRENAME_H 25 #define MESA_GLSL_TO_TGSI_TEMPRENAME_H 26 27 #include "st_glsl_to_tgsi_private.h" 28 29 /** Storage to record the required life time of a temporary register 30 * begin == end == -1 indicates that the register can be reused without 31 * limitations. Otherwise, "begin" indicates the first instruction in which 32 * a write operation may target this temporary, and end indicates the 33 * last instruction in which a value can be read from this temporary. 34 * Hence, a register R2 can be merged with a register R1 if R1.end <= R2.begin. 35 */ 36 struct lifetime { 37 int begin; 38 int end; 39 }; 40 41 /** Evaluates the required life times of temporary registers in a shader. 42 * The life time estimation can only be run sucessfully if the shader doesn't 43 * call a subroutine. 44 * @param[in] mem_ctx a memory context that can be used with the ralloc_* functions 45 * @param[in] instructions the shader to be anlzyed 46 * @param[in] ntemps number of temporaries reserved for this shader 47 * @param[in,out] lifetimes memory location to store the estimated required 48 * life times for each temporary register. The parameter must point to 49 * allocated memory that can hold ntemps lifetime structures. On output 50 * the life times contains the life times for the registers with the 51 * exception of TEMP[0]. 52 * @returns: true if the lifetimes were estimated, false if not (i.e. if a 53 * subroutine was called). 54 */ 55 bool 56 get_temp_registers_required_lifetimes(void *mem_ctx, exec_list *instructions, 57 int ntemps, struct lifetime *lifetimes); 58 /** Estimate the merge remapping of the registers. 59 * @param[in] mem_ctx a memory context that can be used with the ralloc_* functions 60 * @param[in] ntemps number of temporaries reserved for this shader 61 * @param[in] lifetimes required life time for each temporary register. 62 * @param[in,out] result memory location to store the register remapping table. 63 * On input the parameter must point to allocated memory that can hold the 64 * renaming information for ntemps registers, on output the mapping is stored. 65 * Note that TEMP[0] is not considered for register renaming. 66 */ 67 void get_temp_registers_remapping(void *mem_ctx, int ntemps, 68 const struct lifetime* lifetimes, 69 struct rename_reg_pair *result); 70 71 #endif