Make delegates_item_empty_jscreation & delegates_qobject comparable

In delegates_qobject, we now use a JS array to store items in before
deletion. This should make it a bit more heavy/slower.

In delegates_item_empty_jscreation, we remove the redundant parenting
(via 'root'), and just use the JS array. This should make it a bit
lighter/faster.

With these changes together, one can meaningfully get a bit of an idea
of the raw impact of allocating QQuickItem vs QObject.

Change-Id: I503a205760ff767b6ca8d42a2989755facaacb12
Reviewed-by: Gunnar Sletta <gunnar@crimson.no>

2 files changed, 9 insertions, 2 deletions

diff --git a/benchmarks/auto/creation/quick.item/delegates_item_empty_jscreation.qml b/benchmarks/auto/creation/quick.item/delegates_item_empty_jscreation.qml
index 89cded0..920b4c8 100644
--- a/benchmarks/auto/creation/quick.item/delegates_item_empty_jscreation.qml
+++ b/benchmarks/auto/creation/quick.item/delegates_item_empty_jscreation.qml
@@ -27,7 +27,7 @@ Benchmark {
         items = [];
 
         for (var i=0; i<root.count; ++i) {
-            var object = component.createObject(root);
+            var object = component.createObject();
             items.push(object);
         }
     }
diff --git a/benchmarks/auto/creation/quick/delegates_qobject.qml b/benchmarks/auto/creation/quick/delegates_qobject.qml
index 130d722..ee9bc3d 100644
--- a/benchmarks/auto/creation/quick/delegates_qobject.qml
+++ b/benchmarks/auto/creation/quick/delegates_qobject.qml
@@ -8,6 +8,7 @@ Benchmark {
     count: 50;
     staticCount: 10000;
 
+    property var items;
     onTChanged: {
         allocate();
     }
@@ -19,9 +20,15 @@ Benchmark {
     }
 
     function allocate() {
+        if (items && items.length) {
+            for (var i=0; i<items.length; ++i)
+                items[i].destroy();
+        }
+        items = [];
+
         for (var i=0; i<root.count; ++i) {
             var object = component.createObject();
-            object.destroy();
+            items.push(object);
         }
     }
 }