DI mode in libgcc for 16-bit machines.

[Ian Lance Taylor]

Florent DEFAY <spira.inhabitant@gmail.com> writes:

> I am working on a new port. I have just compiled libgcc.
> The target is a 16-bit machine and I realize that libgcc contains
> functions for SI but not for DI.
>
> As the machine is 16-bit and HI instructions are all implemented in
> the machine descripton, I supposed
> that libgcc would build SI instructions using HI ones and DI
> instructions the same way.
>
> More over, extend and zero_extend patterns are implemented in all modes.
>
> Why are DI instructions not built in libgcc?
> Is there a solution to get it done?
> If not, what could/should I do ?

If you have already set LIB2_SIDITI_CONV_FUNCS=yes in your t-XXX file,
then you may need to do the rest manually.  Basically you want to define
LIBGCC2_UNITS_PER_WORD differently while compiling libgcc2 multiple
times.  That may require hacking libgcc/Makefile.in; I don't know if
there is any current support for it.

Ian