1 files changed, 6 insertions, 0 deletions
diff --git a/src/wasm-builder.h b/src/wasm-builder.h
index 4f3a80091..0f2c333f9 100644
--- a/src/wasm-builder.h
+++ b/src/wasm-builder.h
@@ -245,6 +245,7 @@ public:
   }
 
   // Additional utility functions for building on top of nodes
+  // Convenient to have these on Builder, as it has allocation built in
 
   static Index addParam(Function* func, Name name, WasmType type) {
     // only ok to add a param if no vars, otherwise indices are invalidated
@@ -368,6 +369,11 @@ public:
     if (!isConcreteWasmType(curr->type)) return curr;
     return makeDrop(curr);
   }
+
+  void flip(If* iff) {
+    std::swap(iff->ifTrue, iff->ifFalse);
+    iff->condition = makeUnary(EqZInt32, iff->condition);
+  }
 };
 
 } // namespace wasm