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

Raymond Toy toy.raymond at gmail.com
Wed Feb 8 21:00:34 UTC 2012

On Wed, Feb 8, 2012 at 12:38 PM, Juan Jose Garcia-Ripoll

>>>> 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.
>> Thanks for the tips.  I'm not very familiar with cffi or uffi.
>> Basically, vector-sap needs to return something that can be made into a
>> pointer for a foreign function to use as the address of an array/vector.
> I do not know how MATLISP invokes BLAS or equivalent functions. If you
> need a pointer, then you need to know in which format MATLISP needs it.

The pointer is a C style pointer to a vector of double-floats.

> I had a look at MATLISP. It is probably not unconceivable to translate it
> all to ECL's FFI constructs. Seems that all the fortran interface is in one
> file (ffi-*.lisp) and generates code automatically. Producing the
> associated C code would be easy and more efficient.
I don't doubt this, but since I'm not at all familiar with ecl's ffi, I'd
like to leverage cffi to do all the dirty work.

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