On 02.07.2022 19:08, Waldek Hebisch wrote:
> On Sat, Jul 02, 2022 at 10:10:11PM +0800, Qian Yun wrote:
...
>
> What I would like to call:
> - matrix-matrix multiplication from BLAS
> - routines like solve, SVD, eigenvalue decomposition from Lapack
> - multiplication for polys over Z_p
>
> That is rather small number of routines (of order of 20). Generating
> signatures for them is not a problem. What remains to solve:
> - detecting if there is BLAS/Lapack available and if yes in
> which library (there are few competing BLAS libraries and
> Lapack may be configured to use any of them). To make
> things more "interesting" original BLAS and Lapack interface
> was in Fortran 77, there are now C wrappers
> - as I mentioned we need to solve problem of transfering data
> to foreign routines
>
> As I mentioned for sbcl we can use pinned objects, for Clozure CL
> and Clisp we need copy, for GCL ATM we just pass pointer to C
> side, but this is not guaranteed to work (basically we bet that
> GCL will not run its garbage collector during foreign call, which
> seem to work in current use. So the remaing part is avalability
> of BLAS/Lapack. In other words, problem is not FFI itself but
> managing dependencies. This affects binary distributions
> because BLAS/Lapack tend to use machine specific instructions
> (BLAS using say AVX will fail on machine without AVX instructions).
>
That sounds interesting.
There is also a very useful fortran to lisp translator (f2cl) available:
https://trac.common-lisp.net/f2cl/
https://trac.common-lisp.net/f2cl/wiki/GettingF2cl
http://quickdocs.org/f2cl/
"""
The easiest way to get F2CL is to use ​Quicklisp. You can just say
(ql:quickload :f2cl)
to get f2cl.
"""
I translated some examples (*)
(https://github.com/nilqed/f2cl/tree/master/packages/) some years ago (e.g.
BLAS) and it worked well, i.e. it seems easier to me to do lisp->spad than
c->spad.
(*) fortran sources partly from netlib.org
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