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shader: Implement delegation of Exit to dispatcher on CFG
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@ -185,8 +185,20 @@ Function::Function(ObjectPool<Block>& block_pool, Location start_address)
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label.block->branch_false = nullptr;
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}
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CFG::CFG(Environment& env_, ObjectPool<Block>& block_pool_, Location start_address)
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: env{env_}, block_pool{block_pool_}, program_start{start_address} {
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CFG::CFG(Environment& env_, ObjectPool<Block>& block_pool_, Location start_address,
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bool exits_to_dispatcher_)
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: env{env_}, block_pool{block_pool_}, program_start{start_address}, exits_to_dispatcher{
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exits_to_dispatcher_} {
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if (exits_to_dispatcher) {
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dispatch_block = block_pool.Create(Block{});
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dispatch_block->begin = {};
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dispatch_block->end = {};
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dispatch_block->end_class = EndClass::Exit;
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dispatch_block->cond = IR::Condition(true);
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dispatch_block->stack = {};
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dispatch_block->branch_true = nullptr;
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dispatch_block->branch_false = nullptr;
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}
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functions.emplace_back(block_pool, start_address);
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for (FunctionId function_id = 0; function_id < functions.size(); ++function_id) {
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while (!functions[function_id].labels.empty()) {
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@ -196,6 +208,12 @@ CFG::CFG(Environment& env_, ObjectPool<Block>& block_pool_, Location start_addre
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AnalyzeLabel(function_id, label);
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}
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}
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if (exits_to_dispatcher) {
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const auto it = functions[0].blocks.rbegin();
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dispatch_block->begin = it->end + 1;
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dispatch_block->end = it->end + 1;
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functions[0].blocks.insert(*dispatch_block);
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}
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}
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void CFG::AnalyzeLabel(FunctionId function_id, Label& label) {
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@ -462,11 +480,22 @@ CFG::AnalysisState CFG::AnalyzeEXIT(Block* block, FunctionId function_id, Locati
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// EXIT will never be taken
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return AnalysisState::Continue;
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}
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if (exits_to_dispatcher && function_id != 0) {
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throw NotImplementedException("Dispatch EXIT on external function.");
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}
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if (pred != Predicate{true} || flow_test != IR::FlowTest::T) {
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if (block->stack.Peek(Token::PEXIT).has_value()) {
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throw NotImplementedException("Conditional EXIT with PEXIT token");
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}
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const IR::Condition cond{flow_test, static_cast<IR::Pred>(pred.index), pred.negated};
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if (exits_to_dispatcher) {
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block->end = pc;
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block->branch_true = dispatch_block;
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block->end_class = EndClass::Branch;
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block->cond = cond;
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block->branch_false = AddLabel(block, block->stack, pc + 1, function_id);
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return AnalysisState::Branch;
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}
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AnalyzeCondInst(block, function_id, pc, EndClass::Exit, cond);
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return AnalysisState::Branch;
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}
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@ -477,6 +506,14 @@ CFG::AnalysisState CFG::AnalyzeEXIT(Block* block, FunctionId function_id, Locati
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block->branch_false = nullptr;
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return AnalysisState::Branch;
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}
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if (exits_to_dispatcher) {
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block->cond = IR::Condition{true};
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block->end = pc;
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block->end_class = EndClass::Branch;
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block->branch_true = dispatch_block;
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block->branch_false = nullptr;
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return AnalysisState::Branch;
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}
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block->end = pc + 1;
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block->end_class = EndClass::Exit;
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return AnalysisState::Branch;
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@ -111,7 +111,8 @@ class CFG {
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};
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public:
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explicit CFG(Environment& env, ObjectPool<Block>& block_pool, Location start_address);
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explicit CFG(Environment& env, ObjectPool<Block>& block_pool, Location start_address,
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bool exits_to_dispatcher = false);
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CFG& operator=(const CFG&) = delete;
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CFG(const CFG&) = delete;
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@ -128,6 +129,10 @@ public:
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return std::span(functions.data(), functions.size());
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}
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[[nodiscard]] bool ExitsToDispatcher() const {
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return exits_to_dispatcher;
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}
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private:
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void AnalyzeLabel(FunctionId function_id, Label& label);
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@ -158,6 +163,8 @@ private:
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boost::container::small_vector<Function, 1> functions;
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FunctionId current_function_id{0};
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Location program_start;
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bool exits_to_dispatcher{};
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Block* dispatch_block{};
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};
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} // namespace Shader::Maxwell::Flow
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