From 5e2a50330a643b4580a94b68b1d68107ec4e1e87 Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Sat, 15 Aug 2026 03:36:58 +0800
Subject: [GlobalISel] Lower integer operations to libcalls

---
 backend/lib/Target/RISCV/RISCVPipeline.cpp | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

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

diff --git a/backend/lib/Target/RISCV/RISCVPipeline.cpp b/backend/lib/Target/RISCV/RISCVPipeline.cpp
index 62b77f0..a8d0a20 100644
--- a/backend/lib/Target/RISCV/RISCVPipeline.cpp
+++ b/backend/lib/Target/RISCV/RISCVPipeline.cpp
@@ -2,6 +2,7 @@
 
 #include "rcc/Target/RISCV/RISCVPipeline.h"
 
+#include "GISel/RISCVCallLowering.h"
 #include "GISel/RISCVRegisterBankInfo.h"
 #include "RISCV.h"
 #include "RISCVInstrInfo.h"
@@ -26,6 +27,10 @@
 namespace rcc::riscv {
 namespace {
 
+[[nodiscard]] LibcallLoweringInfo libcallLoweringInfo(const RISCVSubtarget &Subtarget) {
+  return {Subtarget.getCallLowering(), callingConventionID(CallingConvention::LP64)};
+}
+
 template <typename PassT, typename... ArgumentT>
 [[nodiscard]] Expected<void> addPass(MachineFunctionPassManager &Pipeline,
                                      ArgumentT &&...Arguments) {
@@ -39,7 +44,8 @@ template <typename PassT, typename... ArgumentT>
                                             MachineCombinerStage::PreLegalizer);
   if (!Added)
     return std::unexpected(Added.error());
-  Added = addPass<Legalizer>(Pipeline, Subtarget.getLegalizerInfo(), Options.Optimization);
+  Added = addPass<Legalizer>(Pipeline, Subtarget.getLegalizerInfo(), Options.Optimization,
+                             libcallLoweringInfo(Subtarget));
   if (!Added)
     return std::unexpected(Added.error());
   Added = addPass<RegBankSelect>(Pipeline, Subtarget.getRegBankInfo());
@@ -93,7 +99,8 @@ Expected<void> addCanonicalPipeline(MachineFunctionPassManager &Pipeline,
                                               MachineCombinerStage::PreLegalizer);
     if (!Added)
       return std::unexpected(Added.error());
-    Added = addPass<Legalizer>(Pipeline, Subtarget.getLegalizerInfo(), Options.Optimization);
+    Added = addPass<Legalizer>(Pipeline, Subtarget.getLegalizerInfo(), Options.Optimization,
+                               libcallLoweringInfo(Subtarget));
     if (!Added)
       return std::unexpected(Added.error());
   }
-- 
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