diff -r 000000000000 -r 1918ee327afb tests/benchmarks/qstring/main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/benchmarks/qstring/main.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,141 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#include <QStringList>
+#include <QFile>
+#include <qtest.h>
+
+class tst_QString: public QObject
+{
+    Q_OBJECT
+private slots:
+    void equals() const;
+    void equals_data() const;
+    void fromUtf8() const;
+};
+
+void tst_QString::equals() const
+{
+    QFETCH(QString, a);
+    QFETCH(QString, b);
+
+    QBENCHMARK {
+        a == b;
+    }
+}
+
+void tst_QString::equals_data() const
+{
+    static const struct {
+        ushort data[80];
+        int dummy;              // just to ensure 4-byte alignment
+    } data = {
+        {
+            64, 64, 64, 64,  64, 64, 64, 64,
+            64, 64, 64, 64,  64, 64, 64, 64, // 16
+            64, 64, 64, 64,  64, 64, 64, 64,
+            64, 64, 64, 64,  64, 64, 64, 64, // 32
+            64, 64, 64, 64,  64, 64, 64, 64,
+            64, 64, 64, 64,  64, 64, 64, 64, // 48
+            64, 64, 64, 64,  64, 64, 64, 64,
+            64, 64, 64, 64,  64, 64, 64, 64, // 64
+            64, 64, 64, 64,  96, 96, 96, 96,
+            64, 64, 96, 96,  96, 96, 96, 96  // 80
+        }, 0
+    };
+    const QChar *ptr = reinterpret_cast<const QChar *>(data.data);
+
+    QTest::addColumn<QString>("a");
+    QTest::addColumn<QString>("b");
+    QString base = QString::fromRawData(ptr, 64);
+
+    QTest::newRow("different-length") << base << QString::fromRawData(ptr, 4);
+    QTest::newRow("same-string") << base << base;
+    QTest::newRow("same-data") << base << QString::fromRawData(ptr, 64);
+
+    // try to avoid crossing a cache line (that is, at ptr[64])
+    QTest::newRow("aligned-aligned-4n")
+            << QString::fromRawData(ptr, 60) << QString::fromRawData(ptr + 2, 60);
+    QTest::newRow("aligned-unaligned-4n")
+            << QString::fromRawData(ptr, 60) << QString::fromRawData(ptr + 1, 60);
+    QTest::newRow("unaligned-unaligned-4n")
+            << QString::fromRawData(ptr + 1, 60) << QString::fromRawData(ptr + 3, 60);
+
+    QTest::newRow("aligned-aligned-4n+1")
+            << QString::fromRawData(ptr, 61) << QString::fromRawData(ptr + 2, 61);
+    QTest::newRow("aligned-unaligned-4n+1")
+            << QString::fromRawData(ptr, 61) << QString::fromRawData(ptr + 1, 61);
+    QTest::newRow("unaligned-unaligned-4n+1")
+            << QString::fromRawData(ptr + 1, 61) << QString::fromRawData(ptr + 3, 61);
+
+    QTest::newRow("aligned-aligned-4n-1")
+            << QString::fromRawData(ptr, 59) << QString::fromRawData(ptr + 2, 59);
+    QTest::newRow("aligned-unaligned-4n-1")
+            << QString::fromRawData(ptr, 59) << QString::fromRawData(ptr + 1, 59);
+    QTest::newRow("unaligned-unaligned-4n-1")
+            << QString::fromRawData(ptr + 1, 59) << QString::fromRawData(ptr + 3, 59);
+
+    QTest::newRow("aligned-aligned-2n")
+            << QString::fromRawData(ptr, 58) << QString::fromRawData(ptr + 2, 58);
+    QTest::newRow("aligned-unaligned-2n")
+            << QString::fromRawData(ptr, 58) << QString::fromRawData(ptr + 1, 58);
+    QTest::newRow("unaligned-unaligned-2n")
+            << QString::fromRawData(ptr + 1, 58) << QString::fromRawData(ptr + 3, 58);
+}
+
+void tst_QString::fromUtf8() const
+{
+    QFile file(SRCDIR "utf-8.txt");
+    if (!file.open(QFile::ReadOnly)) {
+        qFatal("Cannot open input file");
+        return;
+    }
+    QByteArray data = file.readAll();
+    const char *d = data.constData();
+    int size = data.size();
+
+    QBENCHMARK {
+        QString::fromUtf8(d, size);
+    }
+}
+
+QTEST_MAIN(tst_QString)
+
+#include "main.moc"