ISD::MEMBARRIER should lower to a libcall (__sync_synchronize) if the target
sets the legalize action to Expand.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106203 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index 5cb89f2..6ae7668 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -2359,10 +2359,22 @@
case ISD::EH_RETURN:
case ISD::EH_LABEL:
case ISD::PREFETCH:
- case ISD::MEMBARRIER:
case ISD::VAEND:
Results.push_back(Node->getOperand(0));
break;
+ case ISD::MEMBARRIER: {
+ // If the target didn't lower this, lower it to '__sync_synchronize()' call
+ TargetLowering::ArgListTy Args;
+ std::pair<SDValue, SDValue> CallResult =
+ TLI.LowerCallTo(Node->getOperand(0), Type::getVoidTy(*DAG.getContext()),
+ false, false, false, false, 0, CallingConv::C, false,
+ /*isReturnValueUsed=*/true,
+ DAG.getExternalSymbol("__sync_synchronize",
+ TLI.getPointerTy()),
+ Args, DAG, dl);
+ Results.push_back(CallResult.second);
+ break;
+ }
case ISD::DYNAMIC_STACKALLOC:
ExpandDYNAMIC_STACKALLOC(Node, Results);
break;