Plan for gc-improv merge

[Laurynas Biveinis]

2010/4/20 Richard Guenther <richard.guenther@gmail.com>:
> On Mon, Apr 19, 2010 at 4:43 PM, Laurynas Biveinis
[...]
>> from
>> foo *x = (foo *)ggc_alloc (sizeof (x));
>> to
>> foo *x = ggc_alloc_foo ();
[...]
> Sounds good to me.  With a typed interface we should know
> the alignment requirements of allocations and so can pack
> objects tighter - do your patches already do that?

No, they don't currently. My goal was to get the API conversion right,
then proceed with the further changes.

> Basically
> we pad any object larger than 8 bytes to multiples of 8 bytes
> even for say objects of size 12 bytes which wastes 50%
> of the storage as we do not know whether 4 byte alignment
> is enough.

This should be one of the low hanging fruits once the branch is merged.

Thanks,
-- 
Laurynas