diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -1394,6 +1394,17 @@
   SDValue &N = NodeMap[V];
   if (N.getNode()) return N;
 
+  // Special handling BitCastInst with a constant.
+  if (const BitCastInst *I = dyn_cast<BitCastInst>(V)) {
+    if (const Constant *C = dyn_cast<Constant>(I->getOperand(0))) {
+      visitBitCast(*I);
+      SDValue &N = NodeMap[V];
+      assert(N.getNode());
+      resolveDanglingDebugInfo(V, N);
+      return N;
+    }
+  }
+
   // If there's a virtual register allocated and initialized for this
   // value, use it.
   if (SDValue copyFromReg = getCopyFromRegs(V, V->getType()))