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/GenericMachineInstrs.h  | 110 +++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 backend/include/rcc/CodeGen/GlobalISel/GenericMachineInstrs.h

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

diff --git a/backend/include/rcc/CodeGen/GlobalISel/GenericMachineInstrs.h b/backend/include/rcc/CodeGen/GlobalISel/GenericMachineInstrs.h
new file mode 100644
index 0000000..d0a176d
--- /dev/null
+++ b/backend/include/rcc/CodeGen/GlobalISel/GenericMachineInstrs.h
@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef RCC_CODEGEN_GLOBALISEL_GENERICMACHINEINSTRS_H
+#define RCC_CODEGEN_GLOBALISEL_GENERICMACHINEINSTRS_H
+
+#include "rcc/CodeGen/GenericOpcodes.h"
+#include "rcc/CodeGen/MachineInstr.h"
+#include "rcc/CodeGen/MachineOperand.h"
+#include "rcc/CodeGen/Register.h"
+
+#include <cassert>
+#include <cstddef>
+
+namespace rcc {
+
+class GenericMachineInstr : public MachineInstr {
+public:
+  GenericMachineInstr() = delete;
+
+  [[nodiscard]] Register getReg(std::size_t Index) const {
+    const MachineOperand *Operand = operandAt(Index);
+    assert(Operand != nullptr && Operand->isRegister());
+    return *Operand->registerValue();
+  }
+
+  [[nodiscard]] static bool classof(const MachineInstr *Instruction) noexcept {
+    return Instruction != nullptr && isGenericOpcode(Instruction->opcode());
+  }
+};
+
+class GUnmerge : public GenericMachineInstr {
+public:
+  [[nodiscard]] std::size_t getNumDefs() const noexcept {
+    return operandCount() - 1;
+  }
+
+  [[nodiscard]] Register getSourceReg() const {
+    return getReg(getNumDefs());
+  }
+
+  [[nodiscard]] static bool classof(const MachineInstr *Instruction) noexcept {
+    return Instruction != nullptr &&
+           Instruction->opcode() == rcc::opcode(GenericOpcode::G_UNMERGE_VALUES);
+  }
+};
+
+class GMergeLikeInstr : public GenericMachineInstr {
+public:
+  [[nodiscard]] std::size_t getNumSources() const noexcept {
+    return operandCount() - 1;
+  }
+
+  [[nodiscard]] Register getSourceReg(std::size_t Index) const {
+    return getReg(Index + 1);
+  }
+
+  [[nodiscard]] static bool classof(const MachineInstr *Instruction) noexcept {
+    if (Instruction == nullptr)
+      return false;
+    switch (static_cast<GenericOpcode>(Instruction->opcode().value())) {
+    case GenericOpcode::G_MERGE_VALUES:
+    case GenericOpcode::G_CONCAT_VECTORS:
+    case GenericOpcode::G_BUILD_VECTOR:
+      return true;
+    default:
+      return false;
+    }
+  }
+};
+
+class GMerge : public GMergeLikeInstr {
+public:
+  [[nodiscard]] static bool classof(const MachineInstr *Instruction) noexcept {
+    return Instruction != nullptr &&
+           Instruction->opcode() == rcc::opcode(GenericOpcode::G_MERGE_VALUES);
+  }
+};
+
+class GConcatVectors : public GMergeLikeInstr {
+public:
+  [[nodiscard]] static bool classof(const MachineInstr *Instruction) noexcept {
+    return Instruction != nullptr &&
+           Instruction->opcode() == rcc::opcode(GenericOpcode::G_CONCAT_VECTORS);
+  }
+};
+
+class GBuildVector : public GMergeLikeInstr {
+public:
+  [[nodiscard]] static bool classof(const MachineInstr *Instruction) noexcept {
+    return Instruction != nullptr &&
+           Instruction->opcode() == rcc::opcode(GenericOpcode::G_BUILD_VECTOR);
+  }
+};
+
+template <typename InstructionT>
+[[nodiscard]] InstructionT &castGenericMachineInstr(MachineInstr &Instruction) {
+  assert(InstructionT::classof(&Instruction));
+  return static_cast<InstructionT &>(Instruction);
+}
+
+template <typename InstructionT>
+[[nodiscard]] const InstructionT &
+castGenericMachineInstr(const MachineInstr &Instruction) {
+  assert(InstructionT::classof(&Instruction));
+  return static_cast<const InstructionT &>(Instruction);
+}
+
+} // namespace rcc
+
+#endif // RCC_CODEGEN_GLOBALISEL_GENERICMACHINEINSTRS_H
-- 
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