Inline the fast path for removeBinding()

Save a function call in the common case where we don't have a binding
This makes a rather large performance difference for setters that do
not have a binding.

Pick-to: 6.0.0 dev
Change-Id: I140f29790f6fe868721a33b9fad37205e547b8e9
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

2 files changed, 17 insertions, 10 deletions

diff --git a/src/corelib/kernel/qproperty.cpp b/src/corelib/kernel/qproperty.cpp
index a93fcdad03..70bed15c23 100644
--- a/src/corelib/kernel/qproperty.cpp
+++ b/src/corelib/kernel/qproperty.cpp
@@ -328,17 +328,18 @@ void QPropertyBindingData::evaluateIfDirty(const QUntypedPropertyData *property)
     binding->evaluateIfDirtyAndReturnTrueIfValueChanged(property);
 }
 
-void QPropertyBindingData::removeBinding()
+void QPropertyBindingData::removeBinding_helper()
 {
     QPropertyBindingDataPointer d{this};
 
-    if (auto *existingBinding = d.bindingPtr()) {
-        auto observer = existingBinding->takeObservers();
-        d_ptr = 0;
-        if (observer)
-            d.setObservers(observer.ptr);
-        existingBinding->unlinkAndDeref();
-    }
+    auto *existingBinding = d.bindingPtr();
+    Q_ASSERT(existingBinding);
+
+    auto observer = existingBinding->takeObservers();
+    d_ptr = 0;
+    if (observer)
+        d.setObservers(observer.ptr);
+    existingBinding->unlinkAndDeref();
 }
 
 void QPropertyBindingData::registerWithCurrentlyEvaluatingBinding() const
diff --git a/src/corelib/kernel/qpropertyprivate.h b/src/corelib/kernel/qpropertyprivate.h
index 69e88b599f..f4b81ea40b 100644
--- a/src/corelib/kernel/qpropertyprivate.h
+++ b/src/corelib/kernel/qpropertyprivate.h
@@ -248,7 +248,11 @@ public:
     }
 
     void evaluateIfDirty(const QUntypedPropertyData *property) const;
-    void removeBinding();
+    void removeBinding()
+    {
+        if (hasBinding())
+            removeBinding_helper();
+    }
 
     void registerWithCurrentlyEvaluatingBinding(QtPrivate::BindingEvaluationState *currentBinding) const
     {
@@ -257,8 +261,10 @@ public:
         registerWithCurrentlyEvaluatingBinding_helper(currentBinding);
     }
     void registerWithCurrentlyEvaluatingBinding() const;
-    void registerWithCurrentlyEvaluatingBinding_helper(BindingEvaluationState *currentBinding) const;
     void notifyObservers(QUntypedPropertyData *propertyDataPtr) const;
+private:
+    void registerWithCurrentlyEvaluatingBinding_helper(BindingEvaluationState *currentBinding) const;
+    void removeBinding_helper();
 };
 
 template <typename T, typename Tag>