[Python-Dev] Possible optimization for LOAD_FAST ?
stutzbach at google.com
Tue Jan 4 23:15:18 CET 2011
On Tue, Jan 4, 2011 at 9:33 AM, Lukas Lueg <lukas.lueg at googlemail.com>wrote:
> The keys are immutable anyway so the instances of PyDict could manage
> a opaque value (in fact, a counter) that changes every time a new
> value is written to any key. Once we get a reference out of the dict,
> we can can do very fast lookups by passing the key, the reference we
> know from the last lookup and our last state. The lookup returns a new
> reference and the new state.
> If the dict has not changed, the state doesnt change and the reference
> is simply taken from the passed value passed to the lookup. That way
> the code remains the same no matter if the dict has changed or not.
I have had similar ideas in the past but have never found time to explore
them. The same mechanism could also be used to speed up attribute access on
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