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structured_control_flow: Add DemoteCombinationPass
Some drivers misread data when demotes are interleaved in the program. This moves demote branches to be checked at the end of the program. Fixes "wireframe" issue in Pokemon SwSh on some drivers
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c20ea89390
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@ -660,6 +660,9 @@ public:
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IR::Block& first_block{*syntax_list.front().data.block};
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IR::Block& first_block{*syntax_list.front().data.block};
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IR::IREmitter ir(first_block, first_block.begin());
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IR::IREmitter ir(first_block, first_block.begin());
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ir.Prologue();
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ir.Prologue();
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if (uses_demote_to_helper) {
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DemoteCombinationPass();
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}
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}
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}
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private:
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private:
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@ -809,7 +812,14 @@ private:
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}
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}
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case StatementType::Return: {
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case StatementType::Return: {
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ensure_block();
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ensure_block();
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IR::IREmitter{*current_block}.Epilogue();
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IR::Block* return_block{block_pool.Create(inst_pool)};
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IR::IREmitter{*return_block}.Epilogue();
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current_block->AddBranch(return_block);
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auto& merge{syntax_list.emplace_back()};
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merge.type = IR::AbstractSyntaxNode::Type::Block;
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merge.data.block = return_block;
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current_block = nullptr;
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current_block = nullptr;
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syntax_list.emplace_back().type = IR::AbstractSyntaxNode::Type::Return;
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syntax_list.emplace_back().type = IR::AbstractSyntaxNode::Type::Return;
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break;
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break;
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@ -824,6 +834,7 @@ private:
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auto& merge{syntax_list.emplace_back()};
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auto& merge{syntax_list.emplace_back()};
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merge.type = IR::AbstractSyntaxNode::Type::Block;
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merge.type = IR::AbstractSyntaxNode::Type::Block;
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merge.data.block = demote_block;
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merge.data.block = demote_block;
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uses_demote_to_helper = true;
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break;
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break;
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}
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}
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case StatementType::Unreachable: {
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case StatementType::Unreachable: {
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@ -855,11 +866,106 @@ private:
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return block_pool.Create(inst_pool);
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return block_pool.Create(inst_pool);
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}
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}
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void DemoteCombinationPass() {
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using Type = IR::AbstractSyntaxNode::Type;
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std::vector<IR::Block*> demote_blocks;
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std::vector<IR::U1> demote_conds;
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u32 num_epilogues{};
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for (const IR::AbstractSyntaxNode& node : syntax_list) {
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if (node.type != Type::Block) {
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continue;
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}
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for (const IR::Inst& inst : node.data.block->Instructions()) {
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const IR::Opcode op{inst.GetOpcode()};
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if (op == IR::Opcode::DemoteToHelperInvocation) {
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demote_blocks.push_back(node.data.block);
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break;
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}
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if (op == IR::Opcode::Epilogue) {
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++num_epilogues;
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}
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}
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}
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if (demote_blocks.size() == 0) {
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return;
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}
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if (num_epilogues > 1) {
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LOG_DEBUG(Shader, "Combining demotes with more than one return is not implemented.");
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return;
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}
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s64 last_iterator_offset{};
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auto& asl{syntax_list};
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for (const IR::Block* demote_block : demote_blocks) {
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const auto start_it{asl.begin() + last_iterator_offset};
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auto asl_it{std::find_if(start_it, asl.end(), [&](const IR::AbstractSyntaxNode& asn) {
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return asn.type == Type::If && asn.data.if_node.body == demote_block;
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})};
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if (asl_it == asl.end()) {
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// Demote without a conditional branch.
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// No need to proceed since all fragment instances will be demoted regardless.
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return;
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}
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const IR::Block* const end_if = asl_it->data.if_node.merge;
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demote_conds.push_back(asl_it->data.if_node.cond);
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last_iterator_offset = std::distance(asl.begin(), asl_it);
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asl_it = asl.erase(asl_it);
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asl_it = std::find_if(asl_it, asl.end(), [&](const IR::AbstractSyntaxNode& asn) {
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return asn.type == Type::Block && asn.data.block == demote_block;
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});
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asl_it = asl.erase(asl_it);
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asl_it = std::find_if(asl_it, asl.end(), [&](const IR::AbstractSyntaxNode& asn) {
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return asn.type == Type::EndIf && asn.data.end_if.merge == end_if;
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});
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asl_it = asl.erase(asl_it);
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}
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const auto epilogue_func{[](const IR::AbstractSyntaxNode& asn) {
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if (asn.type != Type::Block) {
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return false;
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}
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for (const auto& inst : asn.data.block->Instructions()) {
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if (inst.GetOpcode() == IR::Opcode::Epilogue) {
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return true;
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}
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}
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return false;
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}};
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const auto reverse_it{std::find_if(asl.rbegin(), asl.rend(), epilogue_func)};
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const auto return_block_it{(reverse_it + 1).base()};
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IR::IREmitter ir{*(return_block_it - 1)->data.block};
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IR::U1 cond(IR::Value(false));
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for (const auto& demote_cond : demote_conds) {
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cond = ir.LogicalOr(cond, demote_cond);
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}
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cond.Inst()->DestructiveAddUsage(1);
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IR::AbstractSyntaxNode demote_if_node{};
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demote_if_node.type = Type::If;
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demote_if_node.data.if_node.cond = cond;
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demote_if_node.data.if_node.body = demote_blocks[0];
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demote_if_node.data.if_node.merge = return_block_it->data.block;
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IR::AbstractSyntaxNode demote_node{};
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demote_node.type = Type::Block;
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demote_node.data.block = demote_blocks[0];
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IR::AbstractSyntaxNode demote_endif_node{};
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demote_endif_node.type = Type::EndIf;
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demote_endif_node.data.end_if.merge = return_block_it->data.block;
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asl.insert(return_block_it, demote_endif_node);
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asl.insert(return_block_it, demote_node);
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asl.insert(return_block_it, demote_if_node);
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}
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ObjectPool<Statement>& stmt_pool;
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ObjectPool<Statement>& stmt_pool;
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ObjectPool<IR::Inst>& inst_pool;
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ObjectPool<IR::Inst>& inst_pool;
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ObjectPool<IR::Block>& block_pool;
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ObjectPool<IR::Block>& block_pool;
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Environment& env;
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Environment& env;
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IR::AbstractSyntaxList& syntax_list;
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IR::AbstractSyntaxList& syntax_list;
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bool uses_demote_to_helper{};
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// TODO: C++20 Remove this when all compilers support constexpr std::vector
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// TODO: C++20 Remove this when all compilers support constexpr std::vector
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#if __cpp_lib_constexpr_vector >= 201907
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#if __cpp_lib_constexpr_vector >= 201907
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