#include "global.h"

s16 mulfx16(s16 x, s16 y)
{
    s32 result;

    result = x;
    result *= y;
    result /= 256;
    return result;
}

s16 mulfxn16(u8 s, s16 x, s16 y)
{
    s32 result;

    result = x;
    result *= y;
    result /= (1 << s);
    return result;
}

s32 mulfx32(s32 x, s32 y)
{
    s64 result;

    result = x;
    result *= y;
    result /= 256;
    return result;
}

s16 divfx16(s16 x, s16 y)
{
    if (y == 0)
    {
        return 0;
    }
    return (x << 8) / y;
}

s16 divfxn16(u8 s, s16 x, s16 y)
{
    if (y == 0)
    {
        return 0;
    }
    return (x << s) / y;
}

s32 divfx32(s32 x, s32 y)
{
    s64 _x;

    if (y == 0)
    {
        return 0;
    }
    _x = x;
    _x *= 256;
    return _x / y;
}

s16 invfx16(s16 y)
{
    s32 x;

    x = 0x10000;
    return x / y;
}

s16 invfxn16(u8 s, s16 y)
{
    s32 x;

    x = 0x100 << s;
    return x / y;
}

s32 invfx32(s32 y)
{
    s64 x;

    x = 0x10000;
    return x / y;
}