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diff --git a/tests/benchmarks/corelib/tools/qstringbuilder/main.cpp b/tests/benchmarks/corelib/tools/qstringbuilder/main.cpp
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+++ b/tests/benchmarks/corelib/tools/qstringbuilder/main.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2011 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 module 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+// Select one of the scenarios below
+#define SCENARIO 1
+
+#if SCENARIO == 1
+// this is the "no harm done" version. Only operator% is active,
+// with NO_CAST * defined
+#define P %
+#undef QT_USE_FAST_OPERATOR_PLUS
+#undef QT_USE_FAST_CONCATENATION
+#define QT_NO_CAST_FROM_ASCII
+#define QT_NO_CAST_TO_ASCII
+#endif
+
+
+#if SCENARIO == 2
+// this is the "full" version. Operator+ is replaced by a QStringBuilder
+// based version
+// with NO_CAST * defined
+#define P +
+#define QT_USE_FAST_OPERATOR_PLUS
+#define QT_USE_FAST_CONCATENATION
+#define QT_NO_CAST_FROM_ASCII
+#define QT_NO_CAST_TO_ASCII
+#endif
+
+#if SCENARIO == 3
+// this is the "no harm done" version. Only operator% is active,
+// with NO_CAST * _not_ defined
+#define P %
+#undef QT_USE_FAST_OPERATOR_PLUS
+#undef QT_USE_FAST_CONCATENATION
+#undef QT_NO_CAST_FROM_ASCII
+#undef QT_NO_CAST_TO_ASCII
+#endif
+
+#if SCENARIO == 4
+// this is the "full" version. Operator+ is replaced by a QStringBuilder
+// based version
+// with NO_CAST * _not_ defined
+#define P +
+#define QT_USE_FAST_OPERATOR_PLUS
+#define QT_USE_FAST_CONCATENATION
+#undef QT_NO_CAST_FROM_ASCII
+#undef QT_NO_CAST_TO_ASCII
+#endif
+
+
+#include <qbytearray.h>
+#include <qdebug.h>
+#include <qstring.h>
+#include <qstringbuilder.h>
+
+#include <qtest.h>
+
+#include <string>
+
+#define COMPARE(a, b) QCOMPARE(a, b)
+//#define COMPARE(a, b)
+
+#define SEP(s) qDebug() << "\n\n-------- " s "  ---------";
+
+#define LITERAL "some string literal"
+
+class tst_qstringbuilder : public QObject
+{
+    Q_OBJECT
+
+public:
+    tst_qstringbuilder()
+      : l1literal(LITERAL),
+        l1string(LITERAL),
+        ba(LITERAL),
+        string(l1string),
+        stdstring(LITERAL),
+        stringref(&string, 2, 10),
+        achar('c'),
+        r2(QLatin1String(LITERAL LITERAL)),
+        r3(QLatin1String(LITERAL LITERAL LITERAL)),
+        r4(QLatin1String(LITERAL LITERAL LITERAL LITERAL)),
+        r5(QLatin1String(LITERAL LITERAL LITERAL LITERAL LITERAL))
+    {}
+
+
+public:
+    enum { N = 10000 };
+
+    int run_traditional()
+    {
+        int s = 0;
+        for (int i = 0; i < N; ++i) {
+#if 0
+            s += QString(l1string + l1string).size();
+            s += QString(l1string + l1string + l1string).size();
+            s += QString(l1string + l1string + l1string + l1string).size();
+            s += QString(l1string + l1string + l1string + l1string + l1string).size();
+#endif
+            s += QString(achar + l1string + achar).size();
+        }
+        return s;
+    }
+
+    int run_builder()
+    {
+        int s = 0;
+        for (int i = 0; i < N; ++i) {
+#if 0
+            s += QString(l1literal P l1literal).size();
+            s += QString(l1literal P l1literal P l1literal).size();
+            s += QString(l1literal P l1literal P l1literal P l1literal).size();
+            s += QString(l1literal P l1literal P l1literal P l1literal P l1literal).size();
+#endif
+            s += QString(achar % l1literal % achar).size();
+        }
+        return s;
+    }
+
+private slots:
+
+    void separator_0() {
+        qDebug() << "\nIn each block the QStringBuilder based result appear first "
+            "(with a 'b_' prefix), QStringBased second ('q_' prefix), std::string "
+            "last ('s_' prefix)\n";
+    }
+
+    void separator_1() { SEP("literal + literal  (builder first)"); }
+
+    void b_2_l1literal() {
+        QBENCHMARK { r = l1literal P l1literal; }
+        COMPARE(r, r2);
+    }
+    #ifndef QT_NO_CAST_FROM_ASCII
+    void b_l1literal_LITERAL() {
+        QBENCHMARK { r = l1literal P LITERAL; }
+        COMPARE(r, r2);
+    }
+    #endif
+    void q_2_l1string() {
+        QBENCHMARK { r = l1string + l1string; }
+        COMPARE(r, r2);
+    }
+
+
+    void separator_2() { SEP("2 strings"); }
+
+    void b_2_string() {
+        QBENCHMARK { r = string P string; }
+        COMPARE(r, r2);
+    }
+    void q_2_string() {
+        QBENCHMARK { r = string + string; }
+        COMPARE(r, r2);
+    }
+    void s_2_string() {
+        QBENCHMARK { stdr = stdstring + stdstring; }
+        COMPARE(stdr, stdstring + stdstring);
+    }
+
+
+    void separator_2c() { SEP("2 string refs"); }
+
+    void b_2_stringref() {
+        QBENCHMARK { r = stringref % stringref; }
+        COMPARE(r, QString(stringref.toString() + stringref.toString()));
+    }
+    void q_2_stringref() {
+        QBENCHMARK { r = stringref.toString() + stringref.toString(); }
+        COMPARE(r, QString(stringref % stringref));
+    }
+
+
+    void separator_2b() { SEP("3 strings"); }
+
+    void b_3_string() {
+        QBENCHMARK { r = string P string P string; }
+        COMPARE(r, r3);
+    }
+    void q_3_string() {
+        QBENCHMARK { r = string + string + string; }
+        COMPARE(r, r3);
+    }
+    void s_3_string() {
+        QBENCHMARK { stdr = stdstring + stdstring + stdstring; }
+        COMPARE(stdr, stdstring + stdstring + stdstring);
+    }
+
+    void separator_2e() { SEP("4 strings"); }
+
+    void b_4_string() {
+        QBENCHMARK { r = string P string P string P string; }
+        COMPARE(r, r4);
+    }
+    void q_4_string() {
+        QBENCHMARK { r = string + string + string + string; }
+        COMPARE(r, r4);
+    }
+    void s_4_string() {
+        QBENCHMARK { stdr = stdstring + stdstring + stdstring + stdstring; }
+        COMPARE(stdr, stdstring + stdstring + stdstring + stdstring);
+    }
+
+
+
+    void separator_2a() { SEP("string + literal  (builder first)"); }
+
+    void b_string_l1literal() {
+        QBENCHMARK { r = string % l1literal; }
+        COMPARE(r, r2);
+    }
+    #ifndef QT_NO_CAST_FROM_ASCII
+    void b_string_LITERAL() {
+        QBENCHMARK { r = string P LITERAL; }
+        COMPARE(r, r2);
+    }
+    void b_LITERAL_string() {
+        QBENCHMARK { r = LITERAL P string; }
+        COMPARE(r, r2);
+    }
+    #endif
+    void b_string_l1string() {
+        QBENCHMARK { r = string P l1string; }
+        COMPARE(r, r2);
+    }
+    void q_string_l1literal() {
+        QBENCHMARK { r = string + l1string; }
+        COMPARE(r, r2);
+    }
+    void q_string_l1string() {
+        QBENCHMARK { r = string + l1string; }
+        COMPARE(r, r2);
+    }
+    void s_LITERAL_string() {
+        QBENCHMARK { stdr = LITERAL + stdstring; }
+        COMPARE(stdr, stdstring + stdstring);
+    }
+
+
+    void separator_3() { SEP("3 literals"); }
+
+    void b_3_l1literal() {
+        QBENCHMARK { r = l1literal P l1literal P l1literal; }
+        COMPARE(r, r3);
+    }
+    void q_3_l1string() {
+        QBENCHMARK { r = l1string + l1string + l1string; }
+        COMPARE(r, r3);
+    }
+    void s_3_l1string() {
+        QBENCHMARK { stdr = stdstring + LITERAL + LITERAL; }
+        COMPARE(stdr, stdstring + stdstring + stdstring);
+    }
+
+
+    void separator_4() { SEP("4 literals"); }
+
+    void b_4_l1literal() {
+        QBENCHMARK { r = l1literal P l1literal P l1literal P l1literal; }
+        COMPARE(r, r4);
+    }
+    void q_4_l1string() {
+        QBENCHMARK { r = l1string + l1string + l1string + l1string; }
+        COMPARE(r, r4);
+    }
+
+
+    void separator_5() { SEP("5 literals"); }
+
+    void b_5_l1literal() {
+        QBENCHMARK { r = l1literal P l1literal P l1literal P l1literal P l1literal; }
+        COMPARE(r, r5);
+    }
+
+    void q_5_l1string() {
+        QBENCHMARK { r = l1string + l1string + l1string + l1string + l1string; }
+        COMPARE(r, r5);
+    }
+
+
+    void separator_6() { SEP("4 chars"); }
+
+    void b_string_4_char() {
+        QBENCHMARK { r = string + achar + achar + achar + achar; }
+        COMPARE(r, QString(string P achar P achar P achar P achar));
+    }
+
+    void q_string_4_char() {
+        QBENCHMARK { r = string + achar + achar + achar + achar; }
+        COMPARE(r, QString(string P achar P achar P achar P achar));
+    }
+
+    void s_string_4_char() {
+        QBENCHMARK { stdr = stdstring + 'c' + 'c' + 'c' + 'c'; }
+        COMPARE(stdr, stdstring + 'c' + 'c' + 'c' + 'c');
+    }
+
+
+    void separator_7() { SEP("char + string + char"); }
+
+    void b_char_string_char() {
+        QBENCHMARK { r = achar + string + achar; }
+        COMPARE(r, QString(achar P string P achar));
+    }
+
+    void q_char_string_char() {
+        QBENCHMARK { r = achar + string + achar; }
+        COMPARE(r, QString(achar P string P achar));
+    }
+
+    void s_char_string_char() {
+        QBENCHMARK { stdr = 'c' + stdstring + 'c'; }
+        COMPARE(stdr, 'c' + stdstring + 'c');
+    }
+
+
+    void separator_8() { SEP("string.arg"); }
+
+    void b_string_arg() {
+        const QString pattern = l1string + QString::fromLatin1("%1") + l1string;
+        QBENCHMARK { r = l1literal P string P l1literal; }
+        COMPARE(r, r3);
+    }
+
+    void q_string_arg() {
+        const QString pattern = l1string + QLatin1String("%1") + l1string;
+        QBENCHMARK { r = pattern.arg(string); }
+        COMPARE(r, r3);
+    }
+
+    void q_bytearray_arg() {
+        QByteArray result;
+        QBENCHMARK { result = ba + ba + ba; }
+    }
+
+
+    void separator_9() { SEP("QString::reserve()"); }
+
+    void b_reserve() {
+        QBENCHMARK {
+            r.clear();
+            r = string P string P string P string;
+        }
+        COMPARE(r, r4);
+    }
+    void b_reserve_lit() {
+        QBENCHMARK {
+            r.clear();
+            r = string P l1literal P string P string;
+        }
+        COMPARE(r, r4);
+    }
+    void s_reserve() {
+        QBENCHMARK {
+            r.clear();
+            r.reserve(string.size() + string.size() + string.size() + string.size());
+            r += string;
+            r += string;
+            r += string;
+            r += string;
+        }
+        COMPARE(r, r4);
+    }
+    void s_reserve_lit() {
+        QBENCHMARK {
+            r.clear();
+            //r.reserve(string.size() + qstrlen(l1string.latin1())
+            //    + string.size() + string.size());
+            r.reserve(1024);
+            r += string;
+            r += l1string;
+            r += string;
+            r += string;
+        }
+        COMPARE(r, r4);
+    }
+
+private:
+    const QLatin1Literal l1literal;
+    const QLatin1String l1string;
+    const QByteArray ba;
+    const QString string;
+    const std::string stdstring;
+    const QStringRef stringref;
+    const QLatin1Char achar;
+    const QString r2, r3, r4, r5;
+
+    // short cuts for results
+    QString r;
+    std::string stdr;
+};
+
+QTEST_MAIN(tst_qstringbuilder)
+
+#include "main.moc"