shader_recompiler: add SSA

src/graphics/shader/recompiler/ir/Block.h

@@ -0,0 +1,63 @@
+#pragma once
+
+#include "graphics/shader/recompiler/ir/Reg.h"
+#include "graphics/shader/recompiler/ir/Value.h"
+
+#include <array>
+#include <initializer_list>
+#include <list>
+#include <span>
+#include <vector>
+
+namespace Libs::Graphics::ShaderRecompiler::IR {
+
+// A standard list provides stable instruction addresses without adding an intrusive-container
+// dependency.
+class Block {
+public:
+	using InstructionList = std::list<Inst>;
+	using iterator        = InstructionList::iterator;
+	using const_iterator  = InstructionList::const_iterator;
+
+	Block() = default;
+	~Block();
+
+	Block(const Block&)            = delete;
+	Block& operator=(const Block&) = delete;
+	Block(Block&&)                 = delete;
+	Block& operator=(Block&&)      = delete;
+
+	Inst&    AppendNewInst(ValueOpcode opcode, std::initializer_list<Value> args = {},
+	                       uint64_t flags = 0);
+	iterator PrependNewInst(iterator insertion_point, ValueOpcode opcode,
+	                        std::initializer_list<Value> args = {}, uint64_t flags = 0);
+	void     AddBranch(Block* block);
+
+	[[nodiscard]] InstructionList&        Instructions();
+	[[nodiscard]] const InstructionList&  Instructions() const;
+	[[nodiscard]] std::span<Block* const> ImmPredecessors() const;
+	[[nodiscard]] std::span<Block* const> ImmSuccessors() const;
+
+	void               SsaSeal();
+	[[nodiscard]] bool IsSsaSealed() const;
+
+	iterator       begin();
+	const_iterator begin() const;
+	iterator       end();
+	const_iterator end() const;
+	bool           empty() const;
+
+	std::array<Value, NumScalarRegs> ssa_sreg_values {};
+	std::array<Value, NumScalarRegs> ssa_thread_bit_sreg_values {};
+	std::array<Value, NumVectorRegs> ssa_vreg_values {};
+
+private:
+	InstructionList     instructions;
+	std::vector<Block*> predecessors;
+	std::vector<Block*> successors;
+	bool                ssa_sealed = false;
+};
+
+using BlockList = std::vector<Block*>;
+
+} // namespace Libs::Graphics::ShaderRecompiler::IR