diff options
Diffstat (limited to 'src/shader_recompiler/frontend/maxwell/structured_control_flow.cpp')
-rw-r--r-- | src/shader_recompiler/frontend/maxwell/structured_control_flow.cpp | 108 |
1 files changed, 107 insertions, 1 deletions
diff --git a/src/shader_recompiler/frontend/maxwell/structured_control_flow.cpp b/src/shader_recompiler/frontend/maxwell/structured_control_flow.cpp index 8b3e0a15c..f124dc8c0 100644 --- a/src/shader_recompiler/frontend/maxwell/structured_control_flow.cpp +++ b/src/shader_recompiler/frontend/maxwell/structured_control_flow.cpp @@ -660,6 +660,9 @@ public: IR::Block& first_block{*syntax_list.front().data.block}; IR::IREmitter ir(first_block, first_block.begin()); ir.Prologue(); + if (uses_demote_to_helper) { + DemoteCombinationPass(); + } } private: @@ -809,7 +812,14 @@ private: } case StatementType::Return: { ensure_block(); - IR::IREmitter{*current_block}.Epilogue(); + IR::Block* return_block{block_pool.Create(inst_pool)}; + IR::IREmitter{*return_block}.Epilogue(); + current_block->AddBranch(return_block); + + auto& merge{syntax_list.emplace_back()}; + merge.type = IR::AbstractSyntaxNode::Type::Block; + merge.data.block = return_block; + current_block = nullptr; syntax_list.emplace_back().type = IR::AbstractSyntaxNode::Type::Return; break; @@ -824,6 +834,7 @@ private: auto& merge{syntax_list.emplace_back()}; merge.type = IR::AbstractSyntaxNode::Type::Block; merge.data.block = demote_block; + uses_demote_to_helper = true; break; } case StatementType::Unreachable: { @@ -855,11 +866,106 @@ private: return block_pool.Create(inst_pool); } + void DemoteCombinationPass() { + using Type = IR::AbstractSyntaxNode::Type; + std::vector<IR::Block*> demote_blocks; + std::vector<IR::U1> demote_conds; + u32 num_epilogues{}; + for (const IR::AbstractSyntaxNode& node : syntax_list) { + if (node.type != Type::Block) { + continue; + } + for (const IR::Inst& inst : node.data.block->Instructions()) { + const IR::Opcode op{inst.GetOpcode()}; + if (op == IR::Opcode::DemoteToHelperInvocation) { + demote_blocks.push_back(node.data.block); + break; + } + if (op == IR::Opcode::Epilogue) { + ++num_epilogues; + } + } + } + if (demote_blocks.size() == 0) { + return; + } + if (num_epilogues > 1) { + LOG_DEBUG(Shader, "Combining demotes with more than one return is not implemented."); + return; + } + s64 last_iterator_offset{}; + auto& asl{syntax_list}; + for (const IR::Block* demote_block : demote_blocks) { + const auto start_it{asl.begin() + last_iterator_offset}; + auto asl_it{std::find_if(start_it, asl.end(), [&](const IR::AbstractSyntaxNode& asn) { + return asn.type == Type::If && asn.data.if_node.body == demote_block; + })}; + if (asl_it == asl.end()) { + // Demote without a conditional branch. + // No need to proceed since all fragment instances will be demoted regardless. + return; + } + const IR::Block* const end_if = asl_it->data.if_node.merge; + demote_conds.push_back(asl_it->data.if_node.cond); + last_iterator_offset = std::distance(asl.begin(), asl_it); + + asl_it = asl.erase(asl_it); + asl_it = std::find_if(asl_it, asl.end(), [&](const IR::AbstractSyntaxNode& asn) { + return asn.type == Type::Block && asn.data.block == demote_block; + }); + + asl_it = asl.erase(asl_it); + asl_it = std::find_if(asl_it, asl.end(), [&](const IR::AbstractSyntaxNode& asn) { + return asn.type == Type::EndIf && asn.data.end_if.merge == end_if; + }); + asl_it = asl.erase(asl_it); + } + const auto epilogue_func{[](const IR::AbstractSyntaxNode& asn) { + if (asn.type != Type::Block) { + return false; + } + for (const auto& inst : asn.data.block->Instructions()) { + if (inst.GetOpcode() == IR::Opcode::Epilogue) { + return true; + } + } + return false; + }}; + const auto reverse_it{std::find_if(asl.rbegin(), asl.rend(), epilogue_func)}; + const auto return_block_it{(reverse_it + 1).base()}; + + IR::IREmitter ir{*(return_block_it - 1)->data.block}; + IR::U1 cond(IR::Value(false)); + for (const auto& demote_cond : demote_conds) { + cond = ir.LogicalOr(cond, demote_cond); + } + cond.Inst()->DestructiveAddUsage(1); + + IR::AbstractSyntaxNode demote_if_node{}; + demote_if_node.type = Type::If; + demote_if_node.data.if_node.cond = cond; + demote_if_node.data.if_node.body = demote_blocks[0]; + demote_if_node.data.if_node.merge = return_block_it->data.block; + + IR::AbstractSyntaxNode demote_node{}; + demote_node.type = Type::Block; + demote_node.data.block = demote_blocks[0]; + + IR::AbstractSyntaxNode demote_endif_node{}; + demote_endif_node.type = Type::EndIf; + demote_endif_node.data.end_if.merge = return_block_it->data.block; + + asl.insert(return_block_it, demote_endif_node); + asl.insert(return_block_it, demote_node); + asl.insert(return_block_it, demote_if_node); + } + ObjectPool<Statement>& stmt_pool; ObjectPool<IR::Inst>& inst_pool; ObjectPool<IR::Block>& block_pool; Environment& env; IR::AbstractSyntaxList& syntax_list; + bool uses_demote_to_helper{}; // TODO: C++20 Remove this when all compilers support constexpr std::vector #if __cpp_lib_constexpr_vector >= 201907 |