[LoongArch] Disable mulodi4 and muloti4 libcalls

[heiher]

This library function only exists in compiler-rt not libgcc. So this would fail to link unless we were linking with compiler-rt.

Fixes ClangBuiltLinux/linux#1958

[llvmbot]

@llvm/pr-subscribers-backend-loongarch

Author: hev (heiher)

Changes

This library function only exists in compiler-rt not libgcc. So this would fail to link unless we were linking with compiler-rt.

Fixes ClangBuiltLinux/linux#1958

---

Full diff: https://github.com/llvm/llvm-project/pull/73199.diff

1 Files Affected:

• (modified) llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp (+5)

diff --git a/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp b/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
index f3f72e74ef085a2..ac78789c2c331df 100644
--- a/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
+++ b/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
@@ -152,8 +152,13 @@ LoongArchTargetLowering::LoongArchTargetLowering(const TargetMachine &TM,
 
     // Set libcalls.
     setLibcallName(RTLIB::MUL_I128, nullptr);
+    // The MULO libcall is not part of libgcc, only compiler-rt.
+    setLibcallName(RTLIB::MULO_I64, nullptr);
   }
 
+  // The MULO libcall is not part of libgcc, only compiler-rt.
+  setLibcallName(RTLIB::MULO_I128, nullptr);
+
   setOperationAction(ISD::ATOMIC_FENCE, MVT::Other, Custom);
 
   static const ISD::CondCode FPCCToExpand[] = {

[SixWeining]

It's better to add some tests.

[SixWeining]

LGTM.