On Tue, Jul 11, 2006 at 04:31:36PM -0700, Chip Salzenberg wrote:
>
> There's a PIR file already in svn somewhere in Parrot where a :immediate
> function is used to build a large table programmatically at compile time, so
> that at runtime it's already completely available. That's neat.
Yep. It'll probably doesn't effect the bench time much, but it's used in
examples/shootout/revcomp.pir:
# create tr table at compile-time
# tr{wsatugcyrkmbdhvnATUGCYRKMBDHVN}
# {WSTAACGRYMKVHDBNTAACGRYMKVHDBN};
.sub tr_00_init :immediate
...
.return(tr_array)
.end
> Now think about the alternatives if your goal is to have the table ready to
> go at runtime without any computational overhead at all, e.g. a CRC table.
I think tha main problem are side-effects and compile-time vs. run-time
differences in e.g. math libs. Maybe we can sanitize the evil thing a bit :-)
My mind is split WRT :immediate, heck, I did implement it, OTOH I can forsee
a lot of answers:
- "I'm reading a file within an :immediate Sub" -
- "Don't do that then"
leo
