Re: [PATCH] SPARC: add mcpu=leon3v7 target

[Daniel Hellstrom <daniel at gaisler dot com>]

Hi,


On 10/02/2014 11:22 PM, Eric Botcazou wrote:
> [Sorry for the long delay]
>
> > The LEON3/4 soft-core CPU has support for both SPARCv7 and SPARCv8 that
> > is configurable at design time. The majority of the LEON3 ASICs are v8
> > compatible, however when designing an as small LEON3 as possible, v7
> > without FPU is frequently used.
> >
> > The current GCC leon3 support implies the SPARCv8 instruction set
> > which is not compatible with SPARCv7. Relying on the standard SPARCv7
> > (-mcpu=v7) target for a LEON3-V7 is not feasible since the atomic
> > instruction (CAS) can not be generated by standard v7 target. This
> > is also a problem for binaries aiming to be compatible with all LEON3/4
> > processors.
> >
> >   * config.gcc (sparc*-*-*): Accept mcpu=leon3v7 processor
> >   * doc/invoke.texi (SPARC options): add mcpu=leon3v7 comment
> >   * config/sparc/leon.md (leon3_load, leon_store, leon_fp_*):
> >     handle leon3v7 as leon3
> >   * config/sparc/sparc-opts.h (enum processor_type): Add PROCESSOR_LEON3V7
> >   * config/sparc/sparc.c (sparc_option_override): add leon3v7 support
> >   * config/sparc/sparc.h (TARGET_CPU_leon3v7): new define
> >   * config/sparc/sparc.md (cpu): add leon3v7
> >   * config/sparc/sparc.opt (enum processor_type): Add leon3v7
> OK for all branches (it should apply everywhere I think).

I have sent an updated patch just now. In case -Aleon does not exist it should select -Av7 instead of -Av8.
> I don't remember if I already asked... does Aeroflex/Gaisler have a copyright
> assignment on file for GCC?  If so, do you also want to have SVN write access?
Yes, we have. Just verified that with the FSF. It would be a nice for us to have write access to the sparc parts.

Thanks!
Daniel