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/*
* Copyright © 2017 Gert Wollny
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#ifndef MESA_GLSL_TO_TGSI_TEMPRENAME_H
#define MESA_GLSL_TO_TGSI_TEMPRENAME_H
#include "st_glsl_to_tgsi_array_merge.h"
/** Storage to record the required live range of a temporary register
* begin == end == -1 indicates that the register can be reused without
* limitations. Otherwise, "begin" indicates the first instruction in which
* a write operation may target this temporary, and end indicates the
* last instruction in which a value can be read from this temporary.
* Hence, a register R2 can be merged with a register R1 if R1.end <= R2.begin.
*/
struct register_live_range {
int begin;
int end;
};
/** Evaluates the required live ranges of temporary registers in a shader.
* The live range estimation can only be run sucessfully if the shader doesn't
* call a subroutine.
* @param[in] mem_ctx a memory context that can be used with the ralloc_*
* functions
* @param[in] instructions the shader to be anlzyed
* @param[in] ntemps number of temporaries reserved for this shader
* @param[in,out] reg_live_ranges memory location to store the estimated
* required live ranges for each temporary register. The parameter must
* point to allocated memory that can hold ntemps register_live_range
* structures. On output the live ranges contains the live ranges for
* the registers with the exception of TEMP[0]
* @param[in] narrays number of array sreserved for this shader
* @param[in,out] arr_live_ranges memory location to store the estimated required
* live ranges for each array. The parameter must point to allocated memory
* that can hold narrays array_live_range structures. On output the live
* ranges contains the live ranges for the registers with the exception of
* ARRAY[0].
* @returns: true if the lifetimes were estimated, false if not (i.e. if a
* subroutine was called).
*/
bool
get_temp_registers_required_live_ranges(void *mem_ctx, exec_list *instructions,
int ntemps, struct register_live_range *register_live_ranges,
int narrays, array_live_range *array_live_ranges);
/** Estimate the merge remapping of the registers.
* @param[in] mem_ctx a memory context that can be used with the ralloc_*
* functions
* @param[in] ntemps number of temporaries reserved for this shader
* @param[in] reg_live_ranges required live range for each temporary register.
* @param[in,out] result memory location to store the register remapping table.
* On input the parameter must point to allocated memory that can hold the
* renaming information for ntemps registers, on output the mapping is stored.
* Note that TEMP[0] is not considered for register renaming.
*/
void get_temp_registers_remapping(void *mem_ctx, int ntemps,
const struct register_live_range* reg_live_ranges,
struct rename_reg_pair *result);
#endif
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