diff --git a/llvm/lib/Analysis/IVDescriptors.cpp b/llvm/lib/Analysis/IVDescriptors.cpp
index 641850b46bbd8..30d14b56ed82b 100644
--- a/llvm/lib/Analysis/IVDescriptors.cpp
+++ b/llvm/lib/Analysis/IVDescriptors.cpp
@@ -1250,6 +1250,7 @@ unsigned RecurrenceDescriptor::getOpcode(RecurKind Kind) {
   case RecurKind::FindLastIVUMax:
     // TODO: Set AnyOf and FindIV to Instruction::Select once in-loop reductions
     // are supported.
+    llvm_unreachable("AnyOf and FindIV do not support in-loop");
   default:
     llvm_unreachable("Unknown recurrence operation");
   }