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On Sep 24, 2013, at 9:58 , Eliot Miranda <eliot.miranda@gmail.com> wrote:

On Mon, Sep 23, 2013 at 3:10 PM, Nicolas Cellier <nicolas.cellier.aka.nice@gmail.com> wrote:

Isn't Eliot just implementing this feature, having a segment of non relocatable objects?

Sort of. �Spur will allow any object in old space to stay still, and through become can move any object to old space very simply. �So instead of having a special fixed space segment it has a best-bit compaction algorithm that doesn't slide objects, but moves them into holes. �With this kind of compaction it is very easy to leave objects put.

A further advantage of Spur is that objects have 64-bit alignment so passing arrays to e.g. code using sse instructions, won't cause potential alignment faults.

Not to be a drag, but SSE operations have 16-byte alignment requirement.

With 8-byte aligmnent of first indexable slot, you'd still need to use aligned loads/stores.