diff --git a/llvm/lib/Passes/PassRegistry.def b/llvm/lib/Passes/PassRegistry.def
--- a/llvm/lib/Passes/PassRegistry.def
+++ b/llvm/lib/Passes/PassRegistry.def
@@ -341,6 +341,7 @@
 LOOP_PASS("print<loop-cache-cost>", LoopCachePrinterPass(dbgs()))
 LOOP_PASS("loop-predication", LoopPredicationPass())
 LOOP_PASS("guard-widening", GuardWideningPass())
+LOOP_PASS("simple-loop-unswitch", SimpleLoopUnswitchPass())
 #undef LOOP_PASS
 
 #ifndef LOOP_PASS_WITH_PARAMS