ShaderCache: Order Phi Arguments from farthest away to nearest.
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@ -152,6 +152,17 @@ public:
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return instructions.crend();
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}
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// Set the order of the block, it can be set pre order, the user decides
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void SetOrder(u32 new_order) {
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order = new_order;
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}
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// Get the order of the block.
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// The higher, the closer is the block to the end.
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[[nodiscard]] u32 GetOrder() const {
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return order;
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}
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private:
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/// Memory pool for instruction list
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ObjectPool<Inst>* inst_pool;
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@ -171,6 +182,9 @@ private:
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/// Intrusively stored host definition of this block.
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u32 definition{};
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/// Order of the block.
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u32 order{};
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};
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using BlockList = std::vector<Block*>;
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@ -6,6 +6,7 @@
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#include <memory>
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#include "shader_recompiler/exception.h"
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#include "shader_recompiler/frontend/ir/basic_block.h"
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#include "shader_recompiler/frontend/ir/type.h"
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#include "shader_recompiler/frontend/ir/value.h"
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@ -291,6 +292,16 @@ void Inst::AddPhiOperand(Block* predecessor, const Value& value) {
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phi_args.emplace_back(predecessor, value);
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}
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void Inst::OrderPhiArgs() {
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if (op != Opcode::Phi) {
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throw LogicError("{} is not a Phi instruction", op);
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}
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std::sort(phi_args.begin(), phi_args.end(),
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[](const std::pair<Block*, Value>& a, const std::pair<Block*, Value>& b) {
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return a.first->GetOrder() < b.first->GetOrder();
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});
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}
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void Inst::Invalidate() {
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ClearArgs();
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ReplaceOpcode(Opcode::Void);
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@ -182,6 +182,9 @@ public:
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/// Add phi operand to a phi instruction.
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void AddPhiOperand(Block* predecessor, const Value& value);
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/// Orders the Phi arguments from farthest away to nearest.
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void OrderPhiArgs();
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void Invalidate();
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void ClearArgs();
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@ -27,9 +27,11 @@ IR::BlockList GenerateBlocks(const IR::AbstractSyntaxList& syntax_list) {
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}
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IR::BlockList blocks;
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blocks.reserve(num_syntax_blocks);
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u32 order_index{};
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for (const auto& node : syntax_list) {
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if (node.type == IR::AbstractSyntaxNode::Type::Block) {
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blocks.push_back(node.data.block);
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blocks.back()->SetOrder(order_index++);
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}
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}
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return blocks;
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@ -378,6 +378,13 @@ void SsaRewritePass(IR::Program& program) {
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for (auto block = program.post_order_blocks.rbegin(); block != end; ++block) {
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VisitBlock(pass, *block);
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}
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for (auto block = program.post_order_blocks.rbegin(); block != end; ++block) {
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for (IR::Inst& inst : (*block)->Instructions()) {
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if (inst.GetOpcode() == IR::Opcode::Phi) {
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inst.OrderPhiArgs();
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}
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}
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}
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}
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} // namespace Shader::Optimization
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