Speed up copying of value types in bindings

When a binding results in a value type reference and the destination property
is of the same time, then we can avoid a heap allocation and just allocate
the value type memory on the stack, construct, copy and destruct.

Change-Id: If71ef82b0ced85c1b962c5e44147d6c07edd1440
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/qml/qml/qqmlproperty.cpp b/src/qml/qml/qqmlproperty.cpp
index 931adb9a13..ae452b727e 100644
--- a/src/qml/qml/qqmlproperty.cpp
+++ b/src/qml/qml/qqmlproperty.cpp
@@ -53,6 +53,7 @@
 
 #include <QStringList>
 #include <private/qmetaobject_p.h>
+#include <private/qqmlvaluetypewrapper_p.h>
 #include <QtCore/qdebug.h>
 
 Q_DECLARE_METATYPE(QList<int>)
@@ -1519,6 +1520,11 @@ bool QQmlPropertyPrivate::writeBinding(QObject *object,
                 QUICK_STORE(QString, result.toQStringNoThrow())
             break;
         default:
+            if (const QV4::QQmlValueTypeWrapper *vtw = result.as<const QV4::QQmlValueTypeWrapper>()) {
+                if (vtw->d()->valueType->typeId == core.propType) {
+                    return vtw->write(object, core.coreIndex);
+                }
+            }
             break;
         }
     }