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Re: GMP on IA64-HPUX
On Mon, Dec 05, 2005 at 07:57:43AM -0800, Steve Ellcey wrote:
> > > > So, in short, my questions are: is gmp-4.1.4 supposed to work on
> > > > ia64-hpux?
> > > >
> > > > No, it is not. It might be possible to get either the LP64 or
> > > > the ILP32 ABI to work, but even that requires the workaround you
> > > > mention. Don't expect any HP compiler to compile GMP correctly
> > > > though, unless you switch off optimization.
> > > >
> >
> > If it's really compiler problems, this is one more reason for pulling
> > gmp to the toplevel gcc, so it can be built with a sane compiler.
> >
> > Richard.
>
> FYI: What I do to compile gmp on IA64 HP-UX is to configure gmp with
> '--host=none --target=none --build=none'. This avoids all the target
> specific code. I am sure the performance stinks this way but since it
> is used by the compiler and not in the run-time I haven't found it to be
> a problem. Of course I don't compile any big fortran programs either.
GMP/MPFR are used only in frontend (primarily for constant folding
and Fortran array indices). The types that use GMP/MPFR are converted
in the trans-*.c files to types appropriate for the underlying hardware.
We at most need 128-bits of precision, and I believe the hardware
specific GMP code is most useful for thousands of bits of precision.
In other words, the performance impact is probably not that substantial.
--
Steve