Jacques Lucke
eedcf1876a
This moves all multi-function related code in the `functions` module into a new `multi_function` namespace. This is similar to how there is a `lazy_function` namespace. The main benefit of this is that many types names that were prefixed with `MF` (for "multi function") can be simplified. There is also a common shorthand for the `multi_function` namespace: `mf`. This is also similar to lazy-functions where the shortened namespace is called `lf`.
76 lines
2.9 KiB
C++
76 lines
2.9 KiB
C++
/* 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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