[Ecls-list] building maxima

Raymond Toy toy.raymond at gmail.com
Wed Feb 8 05:55:16 UTC 2012

On 2/3/12 3:33 AM, Juan Jose Garcia-Ripoll wrote:
> On Fri, Feb 3, 2012 at 1:40 AM, Raymond Toy <toy.raymond at gmail.com
> <mailto:toy.raymond at gmail.com>> wrote:
>     1. You have to check after reading the string to see what it
>     contains.  (I guess a very small compile-time cost.)
> Indeed the cost is very small and can be included in the routine that
> reads the string into the buffer.
>     2. Because I didn't think any lisp did that, but it's not illegal
>     to do so.
>     3. It's a burden on the user if the type of a constant string
>     depends on what's in it.  Being illiterate, I only know ASCII, so,
>     perhaps this isn't a problem in practice.
> I implemented this because after I introduced Unicode all programs
> began using 4 times more memory than non-unicode versions of it. It is
> natural: symbols, strings, code, all data can be either base-string or
> extended-strings and if the core does not try to save space,
> everything defaults to the most expensive version.

Indeed.  This is one reason why cmucl uses utf-16 strings.   For most
users this is not a problem because most characters are in the BMP.

> I had a look at f2cl's code and the following code would more or less
> fix it. There might be simpler ways, such as looking only at PARAMETER
> statements, but my fortran is a bit rusty and I do not know f2cl so
> well. Note also that one possible optimization could be to use
> LOAD-TIME-VALUE around COERCE, for those lisps that would not
> precompute the COERCE statement.

Thanks for this fix.  I was looking for something a bit deeper in the
guts of f2cl, but this will probably be fine for now.


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