[RS6000] Don't pass -many to the assembler

[Segher Boessenkool]

On Wed, May 22, 2019 at 12:56:15PM +0930, Alan Modra wrote:
> On Tue, May 21, 2019 at 09:48:10AM -0500, Segher Boessenkool wrote:
> > (Is Power5 2.4?  Not 2.2?)
> 
> Yes, I think power5 was 2.02, but I haven't looked at cpu and arch
> books to verify exactly what power5 and power5+ was.

My notes say p5 is 2.02 and p5+ is 2.04.

> Note that gas
> lumps power5 and power5+ in one category so "power5" from
> rs6000_machine_from_flags means power5+ too.

Gotcha, good to know.

GCC can unfortunately not lump the two together, or code compiled for
Power5 will not necessarily work on a Power5 anymore.  For the few
people who care, but hey.

> This change was based on the fact that "friz" and other similar
> instructions enabled by gcc with TARGET_FPRND are enabled in gas by
> "-mpower5", "-mpwr5", or "-mpwr5x".  ("-mpower5+" isn't a valid gas
> option.)  rs6000-cpus.def puts OPTION_MASK_FPRND in ISA_2_4_MASKS, so
> ISA_2_4_MASKS is the one to use in deciding to pass "-mpower5" to
> gas.

FPRND is power5+, 2.04.

> > -mdejagnu-cpu=power7 should make the -mno-* things unnecessary I think?
> 
> No, it doesn't.  The -mno- options are to counter options added by
> check_vect_support_and_set_flags based on hardware detection.

Yeah, I realised that later...  Some later email I think.

It seems that check_vect_support_and_set_flags will need some work (or
the tests using it).


Segher