c1bc70b711
A lot of files were missing copyright field in the header and
the Blender Foundation contributed to them in a sense of bug
fixing and general maintenance.
This change makes it explicit that those files are at least
partially copyrighted by the Blender Foundation.
Note that this does not make it so the Blender Foundation is
the only holder of the copyright in those files, and developers
who do not have a signed contract with the foundation still
hold the copyright as well.
Another aspect of this change is using SPDX format for the
header. We already used it for the license specification,
and now we state it for the copyright as well, following the
FAQ:
https://reuse.software/faq/
78 lines
2.9 KiB
C++
78 lines
2.9 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Foundation
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#include "FN_multi_function_procedure_optimization.hh"
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namespace blender::fn::multi_function::procedure_optimization {
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void move_destructs_up(Procedure &procedure, Instruction &block_end_instr)
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{
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/* A mapping from a variable to its destruct instruction. */
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Map<Variable *, DestructInstruction *> destruct_instructions;
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Instruction *current_instr = &block_end_instr;
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while (true) {
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InstructionType instr_type = current_instr->type();
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switch (instr_type) {
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case InstructionType::Destruct: {
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DestructInstruction &destruct_instr = static_cast<DestructInstruction &>(*current_instr);
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Variable *variable = destruct_instr.variable();
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if (variable == nullptr) {
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continue;
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}
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/* Remember this destruct instruction so that it can be moved up later on when the last use
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* of the variable is found. */
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destruct_instructions.add(variable, &destruct_instr);
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break;
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}
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case InstructionType::Call: {
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CallInstruction &call_instr = static_cast<CallInstruction &>(*current_instr);
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/* For each variable, place the corresponding remembered destruct instruction right after
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* this call instruction. */
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for (Variable *variable : call_instr.params()) {
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if (variable == nullptr) {
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continue;
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}
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DestructInstruction *destruct_instr = destruct_instructions.pop_default(variable,
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nullptr);
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if (destruct_instr == nullptr) {
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continue;
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}
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/* Unlink destruct instruction from previous position. */
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Instruction *after_destruct_instr = destruct_instr->next();
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while (!destruct_instr->prev().is_empty()) {
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/* Do a copy of the cursor here, because `destruct_instr->prev()` changes when
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* #set_next is called below. */
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const InstructionCursor cursor = destruct_instr->prev()[0];
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cursor.set_next(procedure, after_destruct_instr);
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}
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/* Insert destruct instruction in new position. */
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Instruction *next_instr = call_instr.next();
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call_instr.set_next(destruct_instr);
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destruct_instr->set_next(next_instr);
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}
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break;
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}
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default: {
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break;
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}
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}
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const Span<InstructionCursor> prev_cursors = current_instr->prev();
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if (prev_cursors.size() != 1) {
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/* Stop when there is some branching before this instruction. */
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break;
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}
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const InstructionCursor &prev_cursor = prev_cursors[0];
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current_instr = prev_cursor.instruction();
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if (current_instr == nullptr) {
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/* Stop when there is no previous instruction. E.g. when this is the first instruction. */
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break;
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}
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}
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}
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} // namespace blender::fn::multi_function::procedure_optimization
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