mps32 was Re: upcoming snapshot and 4.6.2
gregory.menke at gsfc.nasa.gov
gregory.menke at gsfc.nasa.gov
Tue Sep 28 17:17:31 UTC 2004
Ralf Corsepius writes:
> On Tue, 2004-09-28 at 17:14, gregory.menke at gsfc.nasa.gov wrote:
> > Ralf Corsepius writes:
> > >
> > > The essential question to me is:
> > > Is -mips32 compiled code compatible to -mips1 compiled code?
> > >
> >
> > IIRC, the changes are principally #ifdefs to influence cpu_asm related
> > register stuff, not gcc code generation issues. The mips32 question
> > arises infrequently enough that I keep forgetting the details.
> AFAIS from the patches in GNATS, you remember correctly.
>
> > I
> > think the upshot is -mips1 or -mips3 is still required to make gcc do
> > the right stuff, mips32 is there to force R4000 registers in cases
> > where they're required. Anyone, please correct me if I'm
> > mis-remembering.
> Well, I suspect a compatibility problem between "gcc -mips32" rsp
> "-arch=mips32" and your patches.
I think this means we have an unfortunate coincidence in naming.
> Your patches rely on "#define __mips32". Current mips-rtems-gcc only
> supports and implies -mips1.
> => If I understand correctly, you assume using gcc -mips1 -D__mips32.
>
> "gcc -mips32" rsp. "gcc -arch=mips32" implicitly changes code generation
> to mips32 and #defines __mips32 rsp. #defines __mips32__.
>
> So, what I actually was asking is: Does the mips-RTEMS code with your
> changes applied support -mips32?
The mips32 people need to weigh in on this one. My understanding was
that normal gcc code generation was sufficient- meaning no -mips32.
> If so, it would be worth considering adding a -mips32 multilib variant
> to gcc (at least for rtems4.7), if not, I'd prefer to see your patches
> changed to not using -D__mips32, because this can be ambiguous and might
> conflict with the flags being implied by "gcc -mips32"
>
> (All defines starting with double underscores are reserved)
Agreed. Since its half done with PR601, would it be reasonable to get
all the __mips32 stuff in, then change it all to something else?
>
> PS: All PM, I tried send to your GSFC email address bounce. Until now
> I've tried 3 different sending addresses (even trying to notify your
> postmaster fails). I'd therefore suggest you to refrain from using your
> GSFC email address in public in future, because people can't reply to
> you. Sorry, but I feel saying this is inevitable.
I was hoping it was a transient problem. I just called the GSFC
networking people, they would like a copy of the bounce. If you could
email it w/ headers to "gregm-news at toadmail.com", I'll forward it to
them and we can do some diagnostics on this end. Apparently, this
shouldn't be happening.... Sorry for the bother.
Gregm
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