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#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