Index: llvm/trunk/lib/Transforms/Scalar/LoopRotation.cpp
===================================================================
--- llvm/trunk/lib/Transforms/Scalar/LoopRotation.cpp
+++ llvm/trunk/lib/Transforms/Scalar/LoopRotation.cpp
@@ -326,6 +326,10 @@
       // Otherwise, stick the new instruction into the new block!
       C->setName(Inst->getName());
       C->insertBefore(LoopEntryBranch);
+
+      if (auto *II = dyn_cast<IntrinsicInst>(C))
+        if (II->getIntrinsicID() == Intrinsic::assume)
+          AC->registerAssumption(II);
     }
   }