[llvm] [CSKY] Don't emit `__multi3` on 32-bit CSKY (PR #69732)

[via llvm-commits]

https://github.com/Dirreke updated https://github.com/llvm/llvm-project/pull/69732

>From c2f3e3a0305fa45e2e8b8d1572ab6c5bc910374d Mon Sep 17 00:00:00 2001
From: Dirreck <mingyang_ge at 163.com>
Date: Fri, 20 Oct 2023 22:58:13 +0800
Subject: [PATCH 1/2] disable `_multi3` for 32-bit target

---
 llvm/lib/Target/CSKY/CSKYISelLowering.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/llvm/lib/Target/CSKY/CSKYISelLowering.cpp b/llvm/lib/Target/CSKY/CSKYISelLowering.cpp
index e3b4a2dc048ab20..9cb7bd7058f9749 100644
--- a/llvm/lib/Target/CSKY/CSKYISelLowering.cpp
+++ b/llvm/lib/Target/CSKY/CSKYISelLowering.cpp
@@ -109,6 +109,14 @@ CSKYTargetLowering::CSKYTargetLowering(const TargetMachine &TM,
 
   setOperationAction(ISD::ATOMIC_FENCE, MVT::Other, Expand);
 
+  // These libcalls are not available in 32-bit.
+  setLibcallName(RTLIB::SHL_I128, nullptr);
+  setLibcallName(RTLIB::SRL_I128, nullptr);
+  setLibcallName(RTLIB::SRA_I128, nullptr);
+  setLibcallName(RTLIB::MUL_I128, nullptr);
+  setLibcallName(RTLIB::MULO_I64, nullptr);
+  setLibcallName(RTLIB::MULO_I128, nullptr);
+      
   // Float
 
   ISD::CondCode FPCCToExtend[] = {

>From 6454411d95411984b10e61b90fdbf21fa08dc844 Mon Sep 17 00:00:00 2001
From: Dirreck <mingyang_ge at 163.com>
Date: Fri, 20 Oct 2023 23:56:29 +0800
Subject: [PATCH 2/2] Update CSKYISelLowering.cpp

---
 llvm/lib/Target/CSKY/CSKYISelLowering.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/lib/Target/CSKY/CSKYISelLowering.cpp b/llvm/lib/Target/CSKY/CSKYISelLowering.cpp
index 9cb7bd7058f9749..ddad1509f0fd730 100644
--- a/llvm/lib/Target/CSKY/CSKYISelLowering.cpp
+++ b/llvm/lib/Target/CSKY/CSKYISelLowering.cpp
@@ -116,7 +116,7 @@ CSKYTargetLowering::CSKYTargetLowering(const TargetMachine &TM,
   setLibcallName(RTLIB::MUL_I128, nullptr);
   setLibcallName(RTLIB::MULO_I64, nullptr);
   setLibcallName(RTLIB::MULO_I128, nullptr);
-      
+
   // Float
 
   ISD::CondCode FPCCToExtend[] = {