dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Thu, May 26, 2011 at 12:44:56PM +0200, Martin Sandve Alnæs wrote:
> On 26 May 2011 12:36, Anders Logg <logg@xxxxxxxxx> wrote:
> > On Thu, May 26, 2011 at 12:12:22PM +0200, Martin Sandve Alnæs wrote:
> >> What is the prefix in this line?
> >>
> >>             (self._compiled_form, module, self.form_data, prefix) = \
> >>                 jit(form,
> >>                     form_compiler_parameters,
> >>                     common_cell)
> >
> > It's the prefix used by the JIT compiler for the generated code files.
> > For FFC, it is set to
> >
> >  prefix = "ffc_form_" + jit_object.signature()
>
> Why is it returned from jit? What is it used for?

It is used in the FFC JIT compiler for elements. This relies on
creating the simplest possible form and then extracting the element
from it. It wasn't needed before, but turned out to be very useful
(perhaps even necessary) during the recent redesign of the JIT
compiler we went through with the preprocess/caching issues.

--
Anders