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Marcin 'Qrczak' Kowalczyk wrote: >>I would be interested to hear why you might want to associate source >>location with other types of object. > > For example to report that it obviously has a wrong type, in an > implementation which tries to infer some types statically. > E.g. (apply f 5). I would associate this error with location of the call to apply. >>(b) You can distinguish small integers by having interned small >>integers be unboxed[**] and uninterned small integers be boxed. > > This complicates the implementation. It's silly to introduce > non-canonical representation of integers just for this reason.I think you are exagerating. If you support boxed bignums, then this approach does not significantly complicate the implementation.
>>[**] Boxed small integers are not necessarily a serious performance >>problem if you use a cache of very small integers. > > It's still some performance hit: > - The cache is much smaller than the range of unboxed numbers > - Reading the value has to dereference a pointer and use processor > cache > - There is no single representation used in various places where > values are known to fit in a machine word, e.g. vector indicesI benchmarked my Scheme with first boxed numbers with a cache and then with unboxed numbers. I found there was no significant difference. Of course, it depends on how often you hit the cache. I was using tak, which can stay completely in the cache.
Regards, Alan -- Dr Alan Watson Centro de Radioastronomía y Astrofísica Universidad Astronómico Nacional de México