49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
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// Copyright 2021 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <boost/container/flat_set.hpp>
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#include <boost/container/small_vector.hpp>
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#include "shader_recompiler/frontend/ir/basic_block.h"
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#include "shader_recompiler/frontend/ir/post_order.h"
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namespace Shader::IR {
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BlockList PostOrder(const BlockList& blocks) {
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boost::container::small_vector<Block*, 16> block_stack;
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boost::container::flat_set<Block*> visited;
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BlockList post_order_blocks;
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post_order_blocks.reserve(blocks.size());
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Block* const first_block{blocks.front()};
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visited.insert(first_block);
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block_stack.push_back(first_block);
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const auto visit_branch = [&](Block* block, Block* branch) {
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if (!branch) {
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return false;
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}
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if (!visited.insert(branch).second) {
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return false;
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}
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// Calling push_back twice is faster than insert on msvc
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block_stack.push_back(block);
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block_stack.push_back(branch);
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return true;
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};
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while (!block_stack.empty()) {
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Block* const block{block_stack.back()};
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block_stack.pop_back();
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if (!visit_branch(block, block->TrueBranch()) &&
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!visit_branch(block, block->FalseBranch())) {
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post_order_blocks.push_back(block);
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}
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}
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return post_order_blocks;
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}
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} // namespace Shader::IR
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