Re: -freg-struct-return?

H. Peter Anvin
2007-02-22T18:49:50Z

Andi Kleen wrote:
> On Thu, Feb 22, 2007 at 09:39:04AM -0800, Jeremy Fitzhardinge wrote:
>> H. Peter Anvin wrote:
>>> Sometimes returning small structures is really nice. If you can pass
>>> them in registers, it's often generates the fastest possible code;
>>> much better than using a pointer.
>> Yes, but specifically, are there any pieces of assembler which return
>> structures? It appears there are none (since Ingo got a booting
>> kernel), but there might be something obscure in some corner.
>
> When I did the x86-64 port I went over all assembler and I can't remember
> anything that did that. Of course there might be out of tree drivers
> that do, but they just have to fix it up.
>
> BTW would it make sense to have a special announcement list for such changes?
>

To some degree linux-arch would be a good list for it, but it's closed,
even to monitor.

-hpa