llvm.memory.barrier, and impl for x86 and alpha

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47204 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 20 insertions, 0 deletions

diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index b50591873d..0d6a47c013 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -1133,6 +1133,16 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
     }
     break;
 
+  case ISD::MEMBARRIER: {
+    assert(Node->getNumOperands() == 6 && "Invalid MemBarrier node!");
+    SDOperand Ops[6];
+    Ops[0] = LegalizeOp(Node->getOperand(0));  // Legalize the chain.
+    for (int x = 1; x < 6; ++x)
+      Ops[x] = PromoteOp(Node->getOperand(x));
+    Result = DAG.UpdateNodeOperands(Result, &Ops[0], 6);
+    break;
+  }
+
   case ISD::Constant: {
     ConstantSDNode *CN = cast<ConstantSDNode>(Node);
     unsigned opAction =
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index f8e1fea679..c12c98b4e3 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -3792,6 +3792,7 @@ std::string SDNode::getOperationName(const SelectionDAG *G) const {
       return "<<Unknown Target Node>>";
     }
    
+  case ISD::MEMBARRIER:    return "MemBarrier";
   case ISD::PCMARKER:      return "PCMarker";
   case ISD::READCYCLECOUNTER: return "ReadCycleCounter";
   case ISD::SRCVALUE:      return "SrcValue";
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index b3d7fbfcf9..7b01d63903 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -3046,6 +3046,15 @@ SelectionDAGLowering::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
     DAG.setRoot(DAG.getNode(ISD::TRAP, MVT::Other, getRoot()));
     return 0;
   }
+  case Intrinsic::memory_barrier: {
+    SDOperand Ops[6];
+    Ops[0] = getRoot();
+    for (int x = 1; x < 6; ++x)
+      Ops[x] = getValue(I.getOperand(x));
+
+    DAG.setRoot(DAG.getNode(ISD::MEMBARRIER, MVT::Other, &Ops[0], 6));
+    return 0;
+  }
   }
 }