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

---
 .../lib/Target/RISCV/RISCVMachineMemoryFolding.cpp | 48 ++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 backend/lib/Target/RISCV/RISCVMachineMemoryFolding.cpp

(limited to 'backend/lib/Target/RISCV/RISCVMachineMemoryFolding.cpp')

diff --git a/backend/lib/Target/RISCV/RISCVMachineMemoryFolding.cpp b/backend/lib/Target/RISCV/RISCVMachineMemoryFolding.cpp
new file mode 100644
index 0000000..2cc5f24
--- /dev/null
+++ b/backend/lib/Target/RISCV/RISCVMachineMemoryFolding.cpp
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "rcc/CodeGen/MachineFunction.h"
+#include "rcc/CodeGen/MachineInstr.h"
+#include "rcc/CodeGen/TargetDescription.h"
+#include "rcc/Target/RISCV/RISCVCodeGen.h"
+
+#include <cstddef>
+#include <optional>
+
+namespace rcc::riscv {
+namespace {
+
+class RISCVMachineMemoryFoldingInfo final : public TargetMemoryFoldingInfo {
+public:
+  [[nodiscard]] Expected<bool> canFoldMemoryOperand(const MachineInstr &, std::size_t,
+                                                    const MachineInstr &, const MachineFunction &,
+                                                    const TargetDescription &) const override {
+    return false;
+  }
+
+  [[nodiscard]] Expected<MachineInstr *>
+  foldMemoryOperand(MachineInstr &, std::size_t, MachineInstr &, MachineFunction &,
+                    const TargetDescription &) const override {
+    return makeUnexpected(ErrorCode::Unsupported,
+                          "RV64GC has no register instruction form with a folded memory operand");
+  }
+
+  [[nodiscard]] Expected<bool> unfoldMemoryOperand(MachineInstr &, MachineFunction &,
+                                                   const TargetDescription &) const override {
+    return false;
+  }
+
+  [[nodiscard]] Expected<std::optional<MemorySize>>
+  getFoldedMemorySize(const MachineInstr &, const MachineFunction &,
+                      const TargetDescription &) const override {
+    return std::optional<MemorySize>{};
+  }
+};
+
+} // namespace
+
+const TargetMemoryFoldingInfo &memoryFoldingInfo() noexcept {
+  static const RISCVMachineMemoryFoldingInfo Value;
+  return Value;
+}
+
+} // namespace rcc::riscv
-- 
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