Comment 5 for bug 956979

On Fri, Mar 16, 2012 at 03:04:14PM -0000, Martin Sandve Alnæs wrote:
> On 16 March 2012 15:49, Johan Hake <email address hidden> wrote:
> > This is really a duplication of bug 897372, which compared FFc and SFC,
> > as SFC compiles the attached form just fine. The generated code is much
> > smaller. Talking with Martin, I get the impression that FFC does not use
> > the information UFL provides about the internal structure of the
> > different sub expressions. I got the impression that FFC lump the whole
> > expression into a large string.
>
> ... for arguments to MathFunctions that is, according to earlier
> comments from Kristian.
>
> Material models for biological tissue often have rather complex
> arguments to e.g. exp.
>
> But Johan, did you try _with_ ffc optimization? I believe that may
> improve the size of the generated code.

I thought the issue was the number of quadrature points used by FFC
trying to integrate the expression exactly. Does it not help to reduce
the quadrature order?

--
Anders

> Martin
>
>
> > Subdividing this string is probably
> > suboptimal compared to using the information already stored in UFL.
> >
> >
> > Title:
> >  FFC generate code which cannot be compiled
> >
> > Status in FEniCS Form Compiler:
> >  New
> >
> > Bug description:
> >  I have a viscoelastic biomechanics form which generate an .h file
> >  which is 45M large, with a single line length of 44M characters long.
> >  This wont compile with gcc. No optimization enabled at all.
> >
> > To manage notifications about this bug go to:
> > https://bugs.launchpad.net/ffc/+bug/956979/+subscriptions
>