shader: Initial recompiler work

src/shader_recompiler/frontend/ir/microinstruction.h

@@ -0,0 +1,82 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+
+#include <boost/intrusive/list.hpp>
+
+#include "common/common_types.h"
+#include "shader_recompiler/frontend/ir/opcode.h"
+#include "shader_recompiler/frontend/ir/type.h"
+#include "shader_recompiler/frontend/ir/value.h"
+
+namespace Shader::IR {
+
+constexpr size_t MAX_ARG_COUNT = 4;
+
+class Inst : public boost::intrusive::list_base_hook<> {
+public:
+    explicit Inst(Opcode op_) noexcept : op(op_) {}
+
+    /// Get the number of uses this instruction has.
+    [[nodiscard]] int UseCount() const noexcept {
+        return use_count;
+    }
+
+    /// Determines whether this instruction has uses or not.
+    [[nodiscard]] bool HasUses() const noexcept {
+        return use_count > 0;
+    }
+
+    /// Get the opcode this microinstruction represents.
+    [[nodiscard]] IR::Opcode Opcode() const noexcept {
+        return op;
+    }
+
+    /// Determines whether or not this instruction may have side effects.
+    [[nodiscard]] bool MayHaveSideEffects() const noexcept;
+
+    /// Determines whether or not this instruction is a pseudo-instruction.
+    /// Pseudo-instructions depend on their parent instructions for their semantics.
+    [[nodiscard]] bool IsPseudoInstruction() const noexcept;
+
+    /// Determines if there is a pseudo-operation associated with this instruction.
+    [[nodiscard]] bool HasAssociatedPseudoOperation() const noexcept;
+    /// Gets a pseudo-operation associated with this instruction
+    [[nodiscard]] Inst* GetAssociatedPseudoOperation(IR::Opcode opcode);
+
+    /// Get the number of arguments this instruction has.
+    [[nodiscard]] size_t NumArgs() const;
+
+    /// Get the type this instruction returns.
+    [[nodiscard]] IR::Type Type() const;
+
+    /// Get the value of a given argument index.
+    [[nodiscard]] Value Arg(size_t index) const;
+    /// Set the value of a given argument index.
+    void SetArg(size_t index, Value value);
+
+    void Invalidate();
+    void ClearArgs();
+
+    void ReplaceUsesWith(Value replacement);
+
+private:
+    void Use(const Value& value);
+    void UndoUse(const Value& value);
+
+    IR::Opcode op{};
+    int use_count{};
+    std::array<Value, MAX_ARG_COUNT> args{};
+    Inst* zero_inst{};
+    Inst* sign_inst{};
+    Inst* carry_inst{};
+    Inst* overflow_inst{};
+    Inst* zsco_inst{};
+    u64 flags{};
+};
+
+} // namespace Shader::IR