1 files changed, 7 insertions, 0 deletions
diff --git a/llvm/lib/Target/BPF/BPFISelLowering.cpp b/llvm/lib/Target/BPF/BPFISelLowering.cpp
index 071fe00..671c119 100644
--- a/llvm/lib/Target/BPF/BPFISelLowering.cpp
+++ b/llvm/lib/Target/BPF/BPFISelLowering.cpp
@@ -20,6 +20,7 @@
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/RuntimeLibcalls.h"
 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
 #include "llvm/CodeGen/ValueTypes.h"
 #include "llvm/IR/DiagnosticInfo.h"
@@ -54,6 +55,12 @@ BPFTargetLowering::BPFTargetLowering(const TargetMachine &TM,
                                      const BPFSubtarget &STI)
     : TargetLowering(TM) {
 
+  // Declare that these mem intrinsics are not available.
+  // PreISel pass should be able to expand them in this case.
+  setLibcallName(RTLIB::MEMCPY, nullptr);
+  setLibcallName(RTLIB::MEMMOVE, nullptr);
+  setLibcallName(RTLIB::MEMSET, nullptr);
+
   // Set up the register classes.
   addRegisterClass(MVT::i64, &BPF::GPRRegClass);
   if (STI.getHasAlu32())