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+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** 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, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#ifndef QMLJS_MATH_H
+#define QMLJS_MATH_H
+
+#include <qglobal.h>
+
+#ifndef QMLJS_LLVM_RUNTIME
+#  include <QtCore/qnumeric.h>
+#endif // QMLJS_LLVM_RUNTIME
+#include <cmath>
+
+#if defined(Q_CC_GNU)
+#define QMLJS_READONLY __attribute((const))
+#else
+#define QMLJS_READONLY
+#endif
+
+QT_BEGIN_NAMESPACE
+
+namespace QV4 {
+
+#if !defined(QMLJS_LLVM_RUNTIME) && defined(Q_CC_GNU) && defined(Q_PROCESSOR_X86)
+
+static inline QMLJS_READONLY Value add_int32(int a, int b)
+{
+    quint8 overflow = 0;
+    int aa = a;
+
+    asm ("addl %2, %1\n"
+         "seto %0"
+    : "=q" (overflow), "=r" (aa)
+         : "r" (b), "1" (aa)
+         : "cc"
+    );
+    if (!overflow)
+        return Value::fromInt32(aa);
+    return Value::fromDouble((double)a + (double)b);
+}
+
+static inline QMLJS_READONLY Value sub_int32(int a, int b)
+{
+    quint8 overflow = 0;
+    int aa = a;
+
+    asm ("subl %2, %1\n"
+         "seto %0"
+    : "=q" (overflow), "=r" (aa)
+         : "r" (b), "1" (aa)
+         : "cc"
+    );
+    if (!overflow)
+        return Value::fromInt32(aa);
+    return Value::fromDouble((double)a - (double)b);
+}
+
+static inline QMLJS_READONLY Value mul_int32(int a, int b)
+{
+    quint8 overflow = 0;
+    int aa = a;
+
+    asm ("imul %2, %1\n"
+         "setc %0"
+         : "=q" (overflow), "=r" (aa)
+         : "r" (b), "1" (aa)
+         : "cc"
+    );
+    if (!overflow)
+        return Value::fromInt32(aa);
+    return Value::fromDouble((double)a * (double)b);
+}
+
+#else
+
+static inline QMLJS_READONLY Value add_int32(int a, int b)
+{
+    qint64 result = a + b;
+    if (result > INT_MAX || result < INT_MIN)
+        return Value::fromDouble(result);
+    return Value::fromInt32(static_cast<int>(result));
+}
+
+static inline QMLJS_READONLY Value sub_int32(int a, int b)
+{
+    qint64 result = a - b;
+    if (result > INT_MAX || result < INT_MIN)
+        return Value::fromDouble(result);
+    return Value::fromInt32(static_cast<int>(result));
+}
+
+static inline QMLJS_READONLY Value mul_int32(int a, int b)
+{
+    qint64 result = a * b;
+    if (result > INT_MAX || result < INT_MIN)
+        return Value::fromDouble(result);
+    return Value::fromInt32(static_cast<int>(result));
+}
+
+#endif // defined(QMLJS_INLINE_MATH)
+
+}
+
+QT_END_NAMESPACE
+
+#ifdef QMLJS_READONLY
+#undef QMLJS_READONLY
+#endif
+
+#endif // QMLJS_MATH_H