Index: llvm/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp
===================================================================
--- llvm/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp
+++ llvm/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp
@@ -2549,10 +2549,11 @@
         }
 
     if (auto *SI = dyn_cast<SwitchInst>(BB->getTerminator())) {
+      const bool HasAtLeastTwoSuccessors = BB->getUniqueSuccessor() == nullptr;
       // We can only consider fully loop-invariant switch conditions as we need
       // to completely eliminate the switch after unswitching.
       if (!isa<Constant>(SI->getCondition()) &&
-          L.isLoopInvariant(SI->getCondition()))
+          L.isLoopInvariant(SI->getCondition()) && HasAtLeastTwoSuccessors)
         UnswitchCandidates.push_back({SI, {SI->getCondition()}});
       continue;
     }
Index: llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-redundant-switch.ll
===================================================================
--- llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-redundant-switch.ll
+++ llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-redundant-switch.ll
@@ -1,5 +1,4 @@
 ; REQUIRES: asserts
-; XFAIL: *
 ; RUN: opt -passes='unswitch<nontrivial>' -disable-output -S < %s
 ; RUN: opt -simple-loop-unswitch -enable-nontrivial-unswitch -disable-output -S < %s