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glasm: Rework control flow introducing a syntax list

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This commit regresses VertexA shaders, their transformation pass has to
be adapted to the new control flow.
This commit is contained in:
ReinUsesLisp
2021-05-14 00:40:54 -03:00
committed by ameerj
parent 7ff5851608
commit d54d7de40e
33 changed files with 437 additions and 505 deletions
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36
src/shader_recompiler/frontend/ir/post_order.cpp
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@ -2,6 +2,8 @@
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <boost/container/flat_set.hpp>
#include <boost/container/small_vector.hpp>
@ -10,35 +12,31 @@
namespace Shader::IR {
BlockList PostOrder(const BlockList& blocks) {
BlockList PostOrder(const AbstractSyntaxNode& root) {
boost::container::small_vector<Block*, 16> block_stack;
boost::container::flat_set<Block*> visited;
BlockList post_order_blocks;
post_order_blocks.reserve(blocks.size());
Block* const first_block{blocks.front()};
if (root.type != AbstractSyntaxNode::Type::Block) {
throw LogicError("First node in abstract syntax list root is not a block");
}
Block* const first_block{root.block};
visited.insert(first_block);
block_stack.push_back(first_block);
const auto visit_branch = [&](Block* block, Block* branch) {
if (!branch) {
return false;
}
if (!visited.insert(branch).second) {
return false;
}
// Calling push_back twice is faster than insert on MSVC
block_stack.push_back(block);
block_stack.push_back(branch);
return true;
};
while (!block_stack.empty()) {
Block* const block{block_stack.back()};
const auto visit{[&](Block* branch) {
if (!visited.insert(branch).second) {
return false;
}
// Calling push_back twice is faster than insert on MSVC
block_stack.push_back(block);
block_stack.push_back(branch);
return true;
}};
block_stack.pop_back();
if (!visit_branch(block, block->TrueBranch()) &&
!visit_branch(block, block->FalseBranch())) {
if (std::ranges::none_of(block->ImmSuccessors(), visit)) {
post_order_blocks.push_back(block);
}
}