From 38626ed37c9ea78c76c12dae4806b750881fd910 Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Tue, 11 Aug 2026 20:26:56 +0800
Subject: [RISCV] Add LP64 calling-convention facts

---
 backend/lib/Target/RISCV/RISCVCodeGen.cpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

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

diff --git a/backend/lib/Target/RISCV/RISCVCodeGen.cpp b/backend/lib/Target/RISCV/RISCVCodeGen.cpp
index bd4e20c..076e030 100644
--- a/backend/lib/Target/RISCV/RISCVCodeGen.cpp
+++ b/backend/lib/Target/RISCV/RISCVCodeGen.cpp
@@ -1470,7 +1470,8 @@ void eraseDeadArtifacts(std::span<MachineInstr *const> Candidates,
 
 [[nodiscard]] Expected<void> lowerMultiplyLibcall(MachineInstr &Instruction,
                                                   MachineFunction &Function,
-                                                  const TargetDescription &Target) {
+                                                  const TargetDescription &Target,
+                                                  CallingConvention Convention) {
   const std::optional<LLT> Type = resultType(Function, Instruction);
   const MachineOperand *DestinationOperand = Instruction.operandAt(0);
   const MachineOperand *LeftOperand = Instruction.operandAt(1);
@@ -1506,7 +1507,7 @@ void eraseDeadArtifacts(std::span<MachineInstr *const> Candidates,
   };
 
   CallLoweringRequest Request;
-  Request.Convention = callingConventionID(CallingConvention::LP64D);
+  Request.Convention = callingConventionID(Convention);
   Request.Callee = std::move(*Callee);
   Request.Arguments = {Value(*Left, 0), Value(*Right, 1)};
   Request.Results = {Value(*Destination, 0)};
@@ -3620,7 +3621,9 @@ public:
       if (Action == LegalizationAction::Custom)
         return widenNarrowMultiply(Instruction, Function, Target);
       if (Action == LegalizationAction::Libcall)
-        return lowerMultiplyLibcall(Instruction, Function, Target);
+        return lowerMultiplyLibcall(Instruction, Function, Target,
+                                    Features.has(RISCVExtension::D) ? CallingConvention::LP64D
+                                                                    : CallingConvention::LP64);
     }
     if (Action == LegalizationAction::Custom &&
         resultType(Function, Instruction)
-- 
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