[PATCH] D155894: [BPF] allow external calls

[Yonghong Song via Phabricator via llvm-commits]

yonghong-song added a comment.

I checked the code and found that ExternalSymbolSDNode is indeed corresponding to builtin/library functions. 
In SelectionDAG/SelectionDAG.cpp, we have

                      getExternalSymbol(TLI->getLibcallName(RTLIB::MEMCPY),
  ...
                      getExternalSymbol(TLI->getLibcallName(LibraryCall),
  ...
                      getExternalSymbol(TLI->getLibcallName(RTLIB::MEMMOVE),
  ...
                      getExternalSymbol(TLI->getLibcallName(LibraryCall),
  ...
          getExternalSymbol(BzeroName, TLI->getPointerTy(DL)), std::move(Args));
  ...
                       getExternalSymbol(TLI->getLibcallName(RTLIB::MEMSET),
  ...
                      getExternalSymbol(TLI->getLibcallName(LibraryCall),
  ...
    SDValue Callee = getExternalSymbol(TLI->getLibcallName(LC),


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https://reviews.llvm.org/D155894