[Freepooma-devel] Re:Efficiently replicating slices?

[ron hylton]

Richard,

Are the duplicate slices going to remain duplicate?  If so you could write 
an engine that wraps a single non-redundant slice and refers all accesses to 
it.

If the copies might change independently you could in principle do 
copy-on-write but this is getting complicated and the efficiency will depend 
on the details of what you're doing.   I think there's an engine that does 
something along the lines of providing demand-zero slices, maybe you could 
use or modify this.

You could also use this technique only on the right-hand side of the 
assignment.  This would save the explicit loop but probably wouldn't help 
performance unless the compiler could see what was going on and was very 
clever about rearranging loops.

Ron