[Python-Dev] Idea for a fast calling convention
tismer at stackless.com
Mon Mar 1 08:04:37 EST 2004
Michael Hudson wrote:
> Christian Tismer <tismer at stackless.com> writes:
>>p.s.: I believe some automatic source analysis and rewrite might pay
>>off in other areas as well. Grepping through the sources, there are
>>still very many similar patterns of PyArg_ParseTupleXXX calls, which
>>could be replaced by less general, optimized versions. This would
>>even *not* cause code bloat, since all those calling sequences would
>>be smaller than now.
> Well, yes. C sucks seriously for things like this, though. It's
> frankly embarassing that *every* time, say, ''.split() is called, some
> silly string is being parsed. Unclear what to do about this (excpet
> PyPy, I guess).
Why not a switch over the arg tuple size?
Or do you mean, this happens in so many different places that
it would be tedious to change that by hand.
Sure, we should not try to morph Pytho into PyPy in the first
But maybe some runtime analysis with a modified version
of PyArg_Parse... things, we could see how often which
format string appears, and how often which optional paths
are used, as a hint for hand optimisation.
I could do that with Stackless, btw. For Win32, I have a few
introspection tools which can do C stack analysis from
a debug build and find out what is being called. They were meant
for later C stack synthesis, which never worked, but this would
give them some use, again.
ciao - chris
Christian Tismer :^) <mailto:tismer at stackless.com>
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