VM: return the loop, it is needed for best performance

factor · Sep 26, 2016 · c6faf98 · c6faf98 · bjourne · Sep 26, 2016
1 parent da670c0
commit c6faf98
Showing 1 changed file with 7 additions and 4 deletions.
diff --git a/vm/nursery_collector.cpp b/vm/nursery_collector.cpp
@@ -14,10 +14,13 @@ struct nursery_copier : no_fixup {
       return obj;
     }
 
-    if (obj->forwarding_pointer_p()) {
-      object* dest = obj->forwarding_pointer();
-      FACTOR_ASSERT(!nursery->contains_p(dest));
-      return dest;
+    // The while-loop is a needed micro-optimization.
+    while (obj->forwarding_pointer_p()) {
+      obj = obj->forwarding_pointer();
+    }
+
+    if (!nursery->contains_p(obj)) {
+      return obj;
     }
 
     cell size = obj->size();