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