diff options
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp index cf845c12462..22b5ae602ce 100644 --- a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp @@ -1767,11 +1767,6 @@ SDValue SelectionDAGLegalize::ExpandBUILD_VECTOR(SDNode *Node) { // and leave the Hi part unset. SDValue SelectionDAGLegalize::ExpandLibCall(RTLIB::Libcall LC, SDNode *Node, bool isSigned) { - // The input chain to this libcall is the entry node of the function. - // Legalizing the call will automatically add the previous call to the - // dependence. - SDValue InChain = DAG.getEntryNode(); - TargetLowering::ArgListTy Args; TargetLowering::ArgListEntry Entry; for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) { @@ -1787,9 +1782,15 @@ SDValue SelectionDAGLegalize::ExpandLibCall(RTLIB::Libcall LC, SDNode *Node, Type *RetTy = Node->getValueType(0).getTypeForEVT(*DAG.getContext()); + // By default, the input chain to this libcall is the entry node of the + // function. If the libcall is going to be emitted as a tail call then + // TLI.isUsedByReturnOnly will change it to the right chain if the return + // node which is being folded has a non-entry input chain. + SDValue InChain = DAG.getEntryNode(); + // isTailCall may be true since the callee does not reference caller stack // frame. Check if it's in the right position. - bool isTailCall = isInTailCallPosition(DAG, Node, TLI); + bool isTailCall = isInTailCallPosition(DAG, Node, InChain, TLI); std::pair<SDValue, SDValue> CallInfo = TLI.LowerCallTo(InChain, RetTy, isSigned, !isSigned, false, false, 0, TLI.getLibcallCallingConv(LC), isTailCall, @@ -1825,7 +1826,7 @@ SDValue SelectionDAGLegalize::ExpandLibCall(RTLIB::Libcall LC, EVT RetVT, Type *RetTy = RetVT.getTypeForEVT(*DAG.getContext()); std::pair<SDValue,SDValue> CallInfo = TLI.LowerCallTo(DAG.getEntryNode(), RetTy, isSigned, !isSigned, false, - false, 0, TLI.getLibcallCallingConv(LC), false, + false, 0, TLI.getLibcallCallingConv(LC), /*isTailCall=*/false, /*doesNotReturn=*/false, /*isReturnValueUsed=*/true, Callee, Args, DAG, dl); |
