diff -r 000000000000 -r 1918ee327afb tests/benchmarks/qregexp/main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/benchmarks/qregexp/main.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,290 @@
+/****************************************************************************
+**
+** 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 <QDebug>
+#include <QRegExp>
+#include <QString>
+
+#include <qtest.h>
+
+
+class tst_qregexp : public QObject
+{
+    Q_OBJECT
+private slots:
+    void escape_old();
+    void escape_old_data() { escape_data(); }
+    void escape_new1();
+    void escape_new1_data() { escape_data(); }
+    void escape_new2();
+    void escape_new2_data() { escape_data(); }
+    void escape_new3();
+    void escape_new3_data() { escape_data(); }
+    void escape_new4();
+    void escape_new4_data() { escape_data(); }
+private:
+    void escape_data();
+};
+
+
+static void verify(const QString &quoted, const QString &expected)
+{
+    if (quoted != expected)
+        qDebug() << "ERROR:" << quoted << expected;
+}
+
+void tst_qregexp::escape_data()
+{
+    QTest::addColumn<QString>("pattern");
+    QTest::addColumn<QString>("expected");
+
+    QTest::newRow("escape 0") << "Hello world" << "Hello world";
+    QTest::newRow("escape 1") << "(Hello world)" << "\\(Hello world\\)";
+    { 
+        QString s;
+        for (int i = 0; i < 10; ++i)
+            s += "(escape)";
+        QTest::newRow("escape 10") << s << QRegExp::escape(s);
+    }
+    { 
+        QString s;
+        for (int i = 0; i < 100; ++i)
+            s += "(escape)";
+        QTest::newRow("escape 100") << s << QRegExp::escape(s);
+    }
+}
+
+void tst_qregexp::escape_old()
+{
+    QFETCH(QString, pattern);
+    QFETCH(QString, expected);
+
+    QBENCHMARK {
+        static const char meta[] = "$()*+.?[\\]^{|}";
+        QString quoted = pattern;
+        int i = 0;
+
+        while (i < quoted.length()) {
+            if (strchr(meta, quoted.at(i).toLatin1()) != 0)
+                quoted.insert(i++, QLatin1Char('\\'));
+            ++i;
+        }
+
+        verify(quoted, expected);
+    }
+}
+
+void tst_qregexp::escape_new1()
+{
+    QFETCH(QString, pattern);
+    QFETCH(QString, expected);
+
+    QBENCHMARK {
+        QString quoted;
+        const int count = pattern.count();
+        quoted.reserve(count * 2);
+        const QLatin1Char backslash('\\');
+        for (int i = 0; i < count; i++) {
+            switch (pattern.at(i).toLatin1()) {
+            case '$':
+            case '(':
+            case ')':
+            case '*':
+            case '+':
+            case '.':
+            case '?':
+            case '[':
+            case '\\':
+            case ']':
+            case '^':
+            case '{':
+            case '|':
+            case '}':
+                quoted.append(backslash);
+            }
+            quoted.append(pattern.at(i));
+        }
+        verify(quoted, expected);
+    }
+}
+
+void tst_qregexp::escape_new2()
+{
+    QFETCH(QString, pattern);
+    QFETCH(QString, expected);
+
+    QBENCHMARK {
+        int count = pattern.count();
+        const QLatin1Char backslash('\\');
+        QString quoted(count * 2, backslash);
+        const QChar *patternData = pattern.data();
+        QChar *quotedData = quoted.data();
+        int escaped = 0;
+        for ( ; --count >= 0; ++patternData) {
+            const QChar c = *patternData;
+            switch (c.unicode()) {
+            case '$':
+            case '(':
+            case ')':
+            case '*':
+            case '+':
+            case '.':
+            case '?':
+            case '[':
+            case '\\':
+            case ']':
+            case '^':
+            case '{':
+            case '|':
+            case '}':
+                ++escaped;
+                ++quotedData;
+            }
+            *quotedData = c;
+            ++quotedData;
+        }
+        quoted.resize(pattern.size() + escaped); 
+
+        verify(quoted, expected);
+    }
+}
+
+void tst_qregexp::escape_new3()
+{
+    QFETCH(QString, pattern);
+    QFETCH(QString, expected);
+
+    QBENCHMARK {
+        QString quoted;
+        const int count = pattern.count();
+        quoted.reserve(count * 2);
+        const QLatin1Char backslash('\\');
+        for (int i = 0; i < count; i++) {
+            switch (pattern.at(i).toLatin1()) {
+            case '$':
+            case '(':
+            case ')':
+            case '*':
+            case '+':
+            case '.':
+            case '?':
+            case '[':
+            case '\\':
+            case ']':
+            case '^':
+            case '{':
+            case '|':
+            case '}':
+                quoted += backslash;
+            }
+            quoted += pattern.at(i);
+        }
+
+        verify(quoted, expected);
+    }
+}
+
+
+static inline bool needsEscaping(int c)
+{
+    switch (c) {
+    case '$':
+    case '(':
+    case ')':
+    case '*':
+    case '+':
+    case '.':
+    case '?':
+    case '[':
+    case '\\':
+    case ']':
+    case '^':
+    case '{':
+    case '|':
+    case '}':
+        return true;
+    }
+    return false;
+}
+
+void tst_qregexp::escape_new4()
+{
+    QFETCH(QString, pattern);
+    QFETCH(QString, expected);
+
+    QBENCHMARK {
+        const int n = pattern.size();
+        const QChar *patternData = pattern.data();
+        // try to prevent copy if no escape is needed
+        int i = 0;
+        for (int i = 0; i != n; ++i) {
+            const QChar c = patternData[i];
+            if (needsEscaping(c.unicode()))
+                break;
+        }
+        if (i == n) {
+            verify(pattern, expected);
+            // no escaping needed, "return pattern" should be done here.
+            return;
+        }
+        const QLatin1Char backslash('\\');
+        QString quoted(n * 2, backslash);
+        QChar *quotedData = quoted.data();
+        for (int j = 0; j != i; ++j) 
+            *quotedData++ = *patternData++;
+        int escaped = 0;
+        for (; i != n; ++i) {
+            const QChar c = *patternData;
+            if (needsEscaping(c.unicode())) {
+                ++escaped;
+                ++quotedData;
+            }
+            *quotedData = c;
+            ++quotedData;
+            ++patternData;
+        }
+        quoted.resize(n + escaped); 
+        verify(quoted, expected);
+        // "return quoted"
+    }
+}
+QTEST_MAIN(tst_qregexp)
+
+#include "main.moc"