[llvm-commits] [llvm] r106203 - /llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp

[Jim Grosbach]

Author: grosbach
Date: Wed Jun 16 21:00:53 2010
New Revision: 106203

URL: http://llvm.org/viewvc/llvm-project?rev=106203&view=rev
Log:
ISD::MEMBARRIER should lower to a libcall (__sync_synchronize) if the target
sets the legalize action to Expand.

Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp?rev=106203&r1=106202&r2=106203&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp Wed Jun 16 21:00:53 2010
@@ -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;