On Mon, Oct 23, 2000 at 08:33:23PM -0400, Uri Guttman wrote:
> as for ziggy's comments on the overload of builtins issue there could be
> a simple dispatch table used instead of direct calls.
I don't think you understand the issue. That's taking great pains
to unthread threaded bytecode once you've gone through the effort
to thread it in the first place.
If you're going to have indirect lookups, keep it localized. Adding
the "simple dispatch table" is adding more instructions (and memory
fetches, and cache flushes) where they're not needed, making the
optimization run slower than what it was trying to optimize.
Perl is just too dynamic to use threaded bytecode out of the box.
I'm with Dan. Make it an optional runtime for everyone who *chooses*
to live within the confines of threaded bytecode. It shouldn't be the
default runtime model because it is too broken.
Remember what Knuth said: premature optimization is the root of all evil.
Z.
