Ralf Hemmecke wrote:
>
> didn't you say that SingleInteger and Integer have the same (LISP)
> representation if the range is in -2^n .. 2^n (n=23?).
> On a 64 bit machine the n is probably bigger.
>
> But anyway, wouldn't be Rep==Integer in HashState do the job of being OK
> for 32 and 64 bit machines if we only access the SingleInteger range of
> a 64 bit machine?
>From correctness point of view Integer as Rep is fine. OTOH you
get performace drop for two reasons:
1) Lisp compiler has to implement basic operations via
library calls (because it can now longer assume that simple
machine operation will do the job)
2) if you exceed range of SingleInteger you pay costs of
memory allocation.
For best performance 'combine' should be implemented as
a Lisp macro (then it can be inlined).
--
Waldek Hebisch
[email protected]
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