Re: [sv-ec] Problems with Appendix D - "Linked List"

Doesn't a queue sometimes have more overhead in terms of simulation performance?

If additions and deletions mainly occur at the ends of the "list" then
a queue may be as efficient, but if a lot of operations take place
in the middle of the list, I would expect the linked list to be more
efficient, since elements are being moved around.

Neil



Gordon Vreugdenhil wrote On 04/03/06 13:49,:
> In Appendix D, List is described as being a 'include of a set of
> parameterized class definitions.  This appears to be a flawed
> approach due to how parameterized class specializations are
> defined in 7.23.
> 
> Consider:
> 
> ------  file p.sv
>      package pkg;
>      'include <List.svh>
>      function void dump_list(input List#(int) thelist);
>        ...
>      endfunction
>      endpackage
> 
> ------ file top.sv
> 
>      module top;
>         import pkg::*;
> 
>         'include <List.svh>
>         List#(int) mylist;
>           ....
>         initial  pkg::dump_list(mylist);
>      endmodule
> 
> This will fail.  The **included** parameterized class
> definitions create two "universes" of incompatible types;
> the specialization inside top and the one inside pkg are
> different types.  Moving the 'include in top.sv outside
> of the module still doesn't help since then the
> parameterized class (and its specializations) are bound
> to the $unit and are not shared with the ones in
> package pkg.
> 
> 
> It isn't obvious that List is really needed in SV;
> queues have closely related functionality that it doesn't
> seem that List presents that much additional functionality --
> a few additional methods (swap, etc) but it isn't obvious
> that we should retain it at all.
> 
> If we do want to retain List, at the very least the List type
> should move to package std so that the type specializations
> can be usefully shared through the design (which I expect was
> the  original intent).
> 
> Gord

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Neil Korpusik                                     Tel: 408-720-4852
Senior Staff Engineer                             Fax: 408-720-4850
Frontend Technologies - ASICs & Processors (FTAP)
Sun Microsystems
email: neil.korpusik@sun.com
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