1 files changed, 5 insertions, 3 deletions
diff --git a/src/passes/SimplifyLocals.cpp b/src/passes/SimplifyLocals.cpp
index 02be1ceec..77b8f1a93 100644
--- a/src/passes/SimplifyLocals.cpp
+++ b/src/passes/SimplifyLocals.cpp
@@ -140,9 +140,11 @@ struct SimplifyLocals
     } else if (curr->is<If>()) {
       assert(!curr->cast<If>()
                 ->ifFalse); // if-elses are handled by doNoteIf* methods
-    } else if (curr->is<Switch>()) {
-      auto* sw = curr->cast<Switch>();
-      auto targets = BranchUtils::getUniqueTargets(sw);
+    } else {
+      // Not one of the recognized instructions, so do not optimize here: mark
+      // all the targets as unoptimizable.
+      // TODO optimize BrOn, Switch, etc.
+      auto targets = BranchUtils::getUniqueTargets(curr);
       for (auto target : targets) {
         self->unoptimizableBlocks.insert(target);
       }