On Mon, 2005-05-02 at 08:58 +0200, Leopold Toetsch wrote:
The vtable functions C<isa> and C<does>, which take now a string, are a bit heavy-weighted and might get an extension in the log run that take an integer flag.
Unless this happens, this would be a HUGE performance hit. After all, Sv*OK is called all over the place in the Perl 5 code, including many places where performance is an issue.
Here is some example P5 source from pp_pow in pp.c:
I presume that Ponie eventually will run Parrot opcodes. pp_pow() is like all these functions part of the perl runloop. Therefore it'll be
infix .MMD_POW, P1, P2, P3
which will do a MM dispatch depending on (P1, P2). That's all. No flags needed.
If you're writing a compiler from scratch, I can see that being mostly true. However, in trying to port Perl 5 guts over to Parrot, there's a lot of code that relies on knowing what's going on (e.g. if a value has ever been a number, etc.)
Most of the guts are called from the runloop. But there is of course XS code that messes with SV internals.
leo
