Make sure to update the CFG correctly if a switch only has a default dest.

This fixes CodeGen/Generic/2006-06-12-LowerSwitchCrash.ll

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28755 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 0a9cb637b477bf971b8734e557d7c349dc49a4f9..1c8714d7d3e8e2caa23e5fa47397aa5273854174 100644 (file)
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -869,6 +869,7 @@ void SelectionDAGLowering::visitSwitch(SwitchInst &I) {
     if (DefaultMBB != NextBlock)
       DAG.setRoot(DAG.getNode(ISD::BR, MVT::Other, getRoot(),
                               DAG.getBasicBlock(DefaultMBB)));
+    CurMBB->addSuccessor(DefaultMBB);
     return;
   }