[Ecls-list] Ecl version of with-float-traps-masked and vector-sap?

[Juan Jose Garcia-Ripoll]

On Wed, Feb 8, 2012 at 6:59 AM, Raymond Toy <toy.raymond at gmail.com> wrote:

> Does ecl have the equivalent of cmucl's (and sbcl's)
> with-float-traps-masked


Not yet. This can be implemented using SI::TRAP-FPE

(defmacro with-float-traps-masked (&body body)
   `(let ((%trap-bits (si::trap-fpe 'cl:last t)))
     (unwind-protect
       (progn (si::trap-fpe %trap-bits nil) , at body)
      (si::trap-fpe %trap-bits t))))


> and vector-sap?
>

Hmm, is this for the CFFI? Because it is going to depend very much on what
VECTOR-SAP has to return. For UFFI you have
SI::MAKE-FOREIGN-DATA-FROM-ARRAY which takes an array and returns an UFFI
pointer. Alternatively, C-INLINE may be easily used to retrieve the pointer
in a C format.

Oh, I also need the equivalent of without-gcing.
>

You only need them to keep the arrays from gc, but this can be ensured by
simply storing the arrays in special or local variables. ECL never moves
data around: it relies on conservative garbage collectors.


> I'm looking at trying to get matlisp to run with ecl, and now that
> someone has contributed an ffi using cffi, I thought getting matlisp
> working with ecl would be nice.


That would indeed be very nice.

Juanjo

-- 
Instituto de Física Fundamental, CSIC
c/ Serrano, 113b, Madrid 28006 (Spain)
http://juanjose.garciaripoll.googlepages.com
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