SelectionDAG: If llvm.donothing has a landingpad, we should clear

CurrentCallSite to avoid an assertion failure:
assert(MMI.getCurrentCallSite() == 0 && "Overlapping call sites!");

rdar://problem/13228754

llvm-svn: 176154

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index b8ab2a9c1bc..e3c2c2e8ef5 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -1872,6 +1872,13 @@ void SelectionDAGBuilder::visitInvoke(const InvokeInst &I) {
     visitInlineAsm(&I);
   else if (Fn && Fn->isIntrinsic()) {
     assert(Fn->getIntrinsicID() == Intrinsic::donothing);
+    // If donothing has a landingpad, we should clear CurrentCallSite.
+    if (LandingPad) {
+      MachineModuleInfo &MMI = DAG.getMachineFunction().getMMI();
+      unsigned CallSiteIndex = MMI.getCurrentCallSite();
+      if (CallSiteIndex)
+        MMI.setCurrentCallSite(0);
+    }
     // Ignore invokes to @llvm.donothing: jump directly to the next BB.
   } else
     LowerCallTo(&I, getValue(Callee), false, LandingPad);