From 8be4d04455f70892a94d1e0798e266c948b4750a Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Fri, 14 Aug 2026 04:33:41 +0800
Subject: [CodeGen] Match LLVM Legalizer ownership

---
 .../rcc/CodeGen/GlobalISel/LegalizerHelper.h       | 47 ++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 backend/include/rcc/CodeGen/GlobalISel/LegalizerHelper.h

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

diff --git a/backend/include/rcc/CodeGen/GlobalISel/LegalizerHelper.h b/backend/include/rcc/CodeGen/GlobalISel/LegalizerHelper.h
new file mode 100644
index 0000000..9a34898
--- /dev/null
+++ b/backend/include/rcc/CodeGen/GlobalISel/LegalizerHelper.h
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef RCC_CODEGEN_GLOBALISEL_LEGALIZERHELPER_H
+#define RCC_CODEGEN_GLOBALISEL_LEGALIZERHELPER_H
+
+#include "rcc/CodeGen/GenericOpcodes.h"
+#include "rcc/CodeGen/GlobalISel/LegalizerInfo.h"
+#include "rcc/CodeGen/MachineIRBuilder.h"
+#include "rcc/Support/Error.h"
+
+namespace rcc {
+
+class MachineFunction;
+class MachineInstr;
+class GISelChangeObserver;
+
+class LegalizerHelper final {
+public:
+  MachineIRBuilder &MIRBuilder;
+  GISelChangeObserver &Observer;
+
+  LegalizerHelper(MachineFunction &Function, const LegalizerInfo &Info,
+                  GISelChangeObserver &Observer, MachineIRBuilder &MIRBuilder);
+
+  [[nodiscard]] Expected<void> legalize(MachineInstr &Instruction,
+                                        const LegalizationDecision &Decision);
+  [[nodiscard]] Expected<void> lower(MachineInstr &Instruction,
+                                     const LegalizationDecision &Decision);
+  [[nodiscard]] Expected<void> lowerVAArg(MachineInstr &Instruction);
+  [[nodiscard]] Expected<void> widenScalar(MachineInstr &Instruction, std::size_t TypeIndex,
+                                           LowLevelType WideType);
+  [[nodiscard]] Expected<void> widenScalarSrc(MachineInstr &Instruction, LowLevelType WideType,
+                                              std::size_t OperandIndex,
+                                              GenericOpcode ExtensionOpcode);
+  [[nodiscard]] Expected<void> widenScalarDst(MachineInstr &Instruction, LowLevelType WideType,
+                                              std::size_t OperandIndex = 0,
+                                              GenericOpcode TruncOpcode = GenericOpcode::G_TRUNC);
+
+private:
+  MachineFunction &Function;
+  MachineRegisterInfo &MRI;
+  const LegalizerInfo &Info;
+};
+
+} // namespace rcc
+
+#endif // RCC_CODEGEN_GLOBALISEL_LEGALIZERHELPER_H
-- 
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