QML: Specialize bindings based on target property type.

When we can determine the type of a target property during type
compilation, we can skip a whole bunch of code that deals with
converting the result of a binding to the correct (target) type.

This removes 65 instructions on x86 for such typed bindings.

Change-Id: Id2c7c57b9ae6dfbeb921121beae9630604ca1d17
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 1 insertions, 2 deletions

diff --git a/src/qml/qml/qqmlobjectcreator.cpp b/src/qml/qml/qqmlobjectcreator.cpp
index 6a54555f3f..2e2d87509a 100644
--- a/src/qml/qml/qqmlobjectcreator.cpp
+++ b/src/qml/qml/qqmlobjectcreator.cpp
@@ -813,8 +813,6 @@ bool QQmlObjectCreator::setPropertyBinding(const QQmlPropertyData *property, con
 
             bs->takeExpression(expr);
         } else {
-            QQmlBinding *qmlBinding = new QQmlBinding(function, _scopeObject, context);
-
             // When writing bindings to grouped properties implemented as value types,
             // such as point.x: { someExpression; }, then the binding is installed on
             // the point property (_qobjectForBindings) and after evaluating the expression,
@@ -824,6 +822,7 @@ bool QQmlObjectCreator::setPropertyBinding(const QQmlPropertyData *property, con
             if (_valueTypeProperty)
                 targetCorePropertyData = QQmlPropertyPrivate::saveValueType(*_valueTypeProperty, _qobject->metaObject(), property->coreIndex, engine);
 
+            QQmlBinding *qmlBinding = QQmlBinding::create(&targetCorePropertyData, function, _scopeObject, context);
             sharedState->allCreatedBindings.push(QQmlAbstractBinding::Ptr(qmlBinding));
 
             qmlBinding->setTarget(_bindingTarget, targetCorePropertyData);