From 495c675771f43cfa12ab7a426a538be72fec1805 Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Sun, 9 Aug 2026 17:03:19 +0800
Subject: [CodeGen] Implement machine optimization and scheduling

---
 .../include/rcc/CodeGen/TargetPseudoExpansion.h    | 40 ++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 backend/include/rcc/CodeGen/TargetPseudoExpansion.h

(limited to 'backend/include/rcc/CodeGen/TargetPseudoExpansion.h')

diff --git a/backend/include/rcc/CodeGen/TargetPseudoExpansion.h b/backend/include/rcc/CodeGen/TargetPseudoExpansion.h
new file mode 100644
index 0000000..4d9f556
--- /dev/null
+++ b/backend/include/rcc/CodeGen/TargetPseudoExpansion.h
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef RCC_CODEGEN_TARGETPSEUDOEXPANSION_H
+#define RCC_CODEGEN_TARGETPSEUDOEXPANSION_H
+
+#include "rcc/Support/Error.h"
+
+#include <cstdint>
+
+namespace rcc {
+
+class MachineFunction;
+class MachineInstr;
+class TargetDescription;
+
+enum class MachinePseudoExpansionPhase : std::uint8_t {
+  PrePEI,
+  PostRA,
+  TargetLate,
+};
+
+class TargetPseudoExpansionInfo {
+public:
+  virtual ~TargetPseudoExpansionInfo() = default;
+
+  [[nodiscard]] virtual Expected<bool> preparePostRAPseudo(MachineInstr &, MachineFunction &,
+                                                           const TargetDescription &) const {
+    return false;
+  }
+
+  [[nodiscard]] virtual Expected<bool> expandPseudo(MachineInstr &, MachinePseudoExpansionPhase,
+                                                    MachineFunction &,
+                                                    const TargetDescription &) const {
+    return false;
+  }
+};
+
+} // namespace rcc
+
+#endif // RCC_CODEGEN_TARGETPSEUDOEXPANSION_H
-- 
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