diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index 2700309e6f0..f20a714d2b8 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -567,6 +567,10 @@ bool FastISel::SelectCall(const User *I) {
   // Handle selected intrinsic function calls.
   switch (F->getIntrinsicID()) {
   default: break;
+    // At -O0 we don't care about the lifetime intrinsics.
+  case Intrinsic::lifetime_start:
+  case Intrinsic::lifetime_end:
+    return true;
   case Intrinsic::dbg_declare: {
     const DbgDeclareInst *DI = cast<DbgDeclareInst>(Call);
     if (!DIVariable(DI->getVariable()).Verify() ||