I want to convert the for loop in the following code into assembly but i am not sure how to start. An explanation of how to do it and why it works would be appreciated.

I am using VS2010, C++, writing for the x86. The code is as follows:

for (n = 0; norm2 < 4.0 && n < N; ++n) 
{
    __asm{
    ///a*a - b*b + x
        fld a // a
        fmul st(0), st(0) // aa
        fld b // b aa
        fmul st(0), st(0) // bb aa
        fsub // (aa-bb) // st(0) - st(1)
        fld x // x (aa-bb)
        fadd // (aa-bb+x)

    /// 2.0*a*b + y;
        fld d // d (aa-bb+x)
        fld a // d a (aa-bb+x)
        fmul // ad (aa-bb+x)
        fld b // b ad (aa-bb+x)
        fmul // abd (aa-bb+x)
        fld y // y adb (aa-bb+x)
        fadd // b:(adb+y) a:(aa-bb+x)

        fld st(0) //b b:(adb+y) a:(aa-bb+x)
        fmul st(0), st(0) // bb b:(adb+y) a:(aa-bb+x)
        fld st(2) // a bb b:(adb+y) a:(aa-bb+x)
        fmul st(0), st(0) // aa bb b:(adb+y) a:(aa-bb+x)
        fadd // aa+bb b:(adb+y) a:(aa-bb+x)
        fstp norm2 // store aa+bb to norm2, st(0) is popped.
        fstp b
        fstp a
    }
}