Re: gcc -m68060 option in kernel Makefiles

[Frank Wille <frank%phoenix.owl.de@localhost>]

Ignatios Souvatzis wrote:

> Hm, what does Amiga have? Back then, I knew what I did - which I don't 
> do any longer by heart, and I'm 400 km away from my 68060 book.
> 
> I seem to recall that -m68060 is fine as long as you don't do floating
> point stuff (same as 68040, btw!) or MMU, and we don't do FP stuff
> in kernel C code, and gcc doesn't do MMU stuff, so it wouldn't make
> a difference.
> 
> The FPU stuff is explicit limited precision arithmetic - contrary to
> setting the precision and then do the generic operations, which is 
> what you have to do with the 68881 or 68882.
> 
> Do I recall correctly?

IIRC...

- The 64/32 integer division (DIV?.L Dn,Dr:Dq) has to be emulated.
- The 32*32->64 bit integer multiplication (MUL?.L) has to be emulated.

-- 
    _  Frank Wille (frank%phoenix.owl.de@localhost)
 _ //  http://sun.hasenbraten.de/~frank/
 \X/   Phx @ #AmigaGer