From 63b14b615eb83ed2b2cdd69b49b283a9b5ff7357 Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Sat, 15 Aug 2026 20:38:43 +0800
Subject: [GlobalISel] Legalize multi-precision multiplication

---
 backend/include/rcc/CodeGen/GlobalISel/LegalizerHelper.h | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'backend/include/rcc/CodeGen')

diff --git a/backend/include/rcc/CodeGen/GlobalISel/LegalizerHelper.h b/backend/include/rcc/CodeGen/GlobalISel/LegalizerHelper.h
index 55665df..eb83c5a 100644
--- a/backend/include/rcc/CodeGen/GlobalISel/LegalizerHelper.h
+++ b/backend/include/rcc/CodeGen/GlobalISel/LegalizerHelper.h
@@ -36,6 +36,7 @@ public:
   [[nodiscard]] Expected<void> lowerMinMax(MachineInstr &Instruction);
   [[nodiscard]] Expected<void> lowerThreewayCompare(MachineInstr &Instruction);
   [[nodiscard]] Expected<void> lowerDivRem(MachineInstr &Instruction);
+  [[nodiscard]] Expected<void> lowerHighMultiply(MachineInstr &Instruction);
   [[nodiscard]] Expected<void> lowerBitCount(MachineInstr &Instruction);
   [[nodiscard]] Expected<void> lowerBswap(MachineInstr &Instruction);
   [[nodiscard]] Expected<void> lowerFunnelShift(MachineInstr &Instruction);
@@ -84,8 +85,14 @@ private:
   [[nodiscard]] Expected<void>
   buildWidenedRemergeToDst(Register Destination, LowLevelType LCMType,
                            const std::vector<Register> &RemergeRegisters);
+  [[nodiscard]] Expected<void> multiplyRegisters(std::vector<Register> &Destinations,
+                                                 const std::vector<Register> &FirstSources,
+                                                 const std::vector<Register> &SecondSources,
+                                                 LowLevelType NarrowType);
   [[nodiscard]] Expected<void> narrowScalarAddSub(MachineInstr &Instruction, std::size_t TypeIndex,
                                                   LowLevelType NarrowType);
+  [[nodiscard]] Expected<void> narrowScalarMul(MachineInstr &Instruction, std::size_t TypeIndex,
+                                               LowLevelType NarrowType);
   [[nodiscard]] Expected<void> narrowScalarBasic(MachineInstr &Instruction, std::size_t TypeIndex,
                                                  LowLevelType NarrowType);
   [[nodiscard]] Expected<void> narrowScalarExt(MachineInstr &Instruction, std::size_t TypeIndex,
-- 
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