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Torsten Ruger 2014-06-16 19:43:42 +02:00
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crystal/optimisations.md
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@ -33,14 +33,14 @@ Well, yes it does, but maybe not more than once: We can conceivably store the re
structure as that would defeat the purpose. structure as that would defeat the purpose.
In fact there could be several caching strategies, possibly for different use cases, possibly determined by actual run-time In fact there could be several caching strategies, possibly for different use cases, possibly determined by actual run-time
measurements, but for now I just destribe a simeple one using Data-Blocks, Dlocks. measurements, but for now I just destribe a simeple one using Data-Blocks, Plocks.
So at a call-site, we know the name of the function we want to call, and the object we want to call it on, and so have to So at a call-site, we know the name of the function we want to call, and the object we want to call it on, and so have to
find the actual function object, and by that the actual call address. In abstract terms we want to create a switch with find the actual function object, and by that the actual call address. In abstract terms we want to create a switch with
3 cases and a default. 3 cases and a default.
So the code is something like, if first cache hit, call first cache , .. times three and if not do the dynamic lookup. So the code is something like, if first cache hit, call first cache , .. times three and if not do the dynamic lookup.
The Dlock can store those cache hits inside the code. So then we "just" need to get the cache loaded. The Plock can store those cache hits inside the code. So then we "just" need to get the cache loaded.
Initializing the cached values is by normal lazy initialization. Ie we check for nil and if so we do the dynamic lookup, and store the result. Initializing the cached values is by normal lazy initialization. Ie we check for nil and if so we do the dynamic lookup, and store the result.