src/mesa/state_tracker/st_glsl_to_tgsi_temprename.h

   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