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shader: Implement delegation of Exit to dispatcher on CFG

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FernandoS27 2021-04-18 19:10:55 +02:00 committed by ameerj
parent f4b82b8dd7
commit da936d6ad8
2 changed files with 47 additions and 3 deletions
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41
src/shader_recompiler/frontend/maxwell/control_flow.cpp
View file

@ -185,8 +185,20 @@ Function::Function(ObjectPool<Block>& block_pool, Location start_address)
label.block->branch_false = nullptr;
}
CFG::CFG(Environment& env_, ObjectPool<Block>& block_pool_, Location start_address)
: env{env_}, block_pool{block_pool_}, program_start{start_address} {
CFG::CFG(Environment& env_, ObjectPool<Block>& block_pool_, Location start_address,
bool exits_to_dispatcher_)
: env{env_}, block_pool{block_pool_}, program_start{start_address}, exits_to_dispatcher{
exits_to_dispatcher_} {
if (exits_to_dispatcher) {
dispatch_block = block_pool.Create(Block{});
dispatch_block->begin = {};
dispatch_block->end = {};
dispatch_block->end_class = EndClass::Exit;
dispatch_block->cond = IR::Condition(true);
dispatch_block->stack = {};
dispatch_block->branch_true = nullptr;
dispatch_block->branch_false = nullptr;
}
functions.emplace_back(block_pool, start_address);
for (FunctionId function_id = 0; function_id < functions.size(); ++function_id) {
while (!functions[function_id].labels.empty()) {
@ -196,6 +208,12 @@ CFG::CFG(Environment& env_, ObjectPool<Block>& block_pool_, Location start_addre
AnalyzeLabel(function_id, label);
}
}
if (exits_to_dispatcher) {
const auto it = functions[0].blocks.rbegin();
dispatch_block->begin = it->end + 1;
dispatch_block->end = it->end + 1;
functions[0].blocks.insert(*dispatch_block);
}
}
void CFG::AnalyzeLabel(FunctionId function_id, Label& label) {
@ -462,11 +480,22 @@ CFG::AnalysisState CFG::AnalyzeEXIT(Block* block, FunctionId function_id, Locati
// EXIT will never be taken
return AnalysisState::Continue;
}
if (exits_to_dispatcher && function_id != 0) {
throw NotImplementedException("Dispatch EXIT on external function.");
}
if (pred != Predicate{true} || flow_test != IR::FlowTest::T) {
if (block->stack.Peek(Token::PEXIT).has_value()) {
throw NotImplementedException("Conditional EXIT with PEXIT token");
}
const IR::Condition cond{flow_test, static_cast<IR::Pred>(pred.index), pred.negated};
if (exits_to_dispatcher) {
block->end = pc;
block->branch_true = dispatch_block;
block->end_class = EndClass::Branch;
block->cond = cond;
block->branch_false = AddLabel(block, block->stack, pc + 1, function_id);
return AnalysisState::Branch;
}
AnalyzeCondInst(block, function_id, pc, EndClass::Exit, cond);
return AnalysisState::Branch;
}
@ -477,6 +506,14 @@ CFG::AnalysisState CFG::AnalyzeEXIT(Block* block, FunctionId function_id, Locati
block->branch_false = nullptr;
return AnalysisState::Branch;
}
if (exits_to_dispatcher) {
block->cond = IR::Condition{true};
block->end = pc;
block->end_class = EndClass::Branch;
block->branch_true = dispatch_block;
block->branch_false = nullptr;
return AnalysisState::Branch;
}
block->end = pc + 1;
block->end_class = EndClass::Exit;
return AnalysisState::Branch;

9
src/shader_recompiler/frontend/maxwell/control_flow.h
View file

@ -111,7 +111,8 @@ class CFG {
};
public:
explicit CFG(Environment& env, ObjectPool<Block>& block_pool, Location start_address);
explicit CFG(Environment& env, ObjectPool<Block>& block_pool, Location start_address,
bool exits_to_dispatcher = false);
CFG& operator=(const CFG&) = delete;
CFG(const CFG&) = delete;
@ -128,6 +129,10 @@ public:
return std::span(functions.data(), functions.size());
}
[[nodiscard]] bool ExitsToDispatcher() const {
return exits_to_dispatcher;
}
private:
void AnalyzeLabel(FunctionId function_id, Label& label);
@ -158,6 +163,8 @@ private:
boost::container::small_vector<Function, 1> functions;
FunctionId current_function_id{0};
Location program_start;
bool exits_to_dispatcher{};
Block* dispatch_block{};
};
} // namespace Shader::Maxwell::Flow