[OE-core] [PATCH 1/2] tune-riscv: Add support for hard and soft float

[Alistair Francis]

On Wed, Nov 6, 2019 at 11:33 PM Nathan Rossi <nathan at nathanrossi.com> wrote:
>
> On Thu, 7 Nov 2019 at 09:34, Adrian Bunk <bunk at stusta.de> wrote:
> >
> > On Wed, Nov 06, 2019 at 10:18:18AM -0800, Alistair Francis wrote:
> > >...
> > > +TUNE_CCARGS_riscv64 .= "${@bb.utils.contains('TUNE_FEATURES', 'riscv64-f', ' -mabi=lp64d', ' -mabi=lp64', d)}"
> > > +TUNE_CCARGS_riscv32 .= "${@bb.utils.contains('TUNE_FEATURES', 'riscv32-f', ' -mabi=ilp32f', ' -mabi=ilp32', d)}"
> > >...
> >
> > That looks wrong, what would you put in TUNE_FEATURES
> > for -mabi=lp64f when -mabi=lp64d is called riscv64-f?
> >
> > Also note that this is only the floating point calling convention,
> > whether the compiler emits floating point instructions is defined
> > by -march.
> >
> > It would be good if this would start with a plan how to handle
> > all possible combination of RISC-V ISA extensions, ideally better
> > than the arm mess.
>
> I am keen to see this as well, since I am currently directly
> hardcoding -march/-mabi in the machine conf.
>
> It would be nice to see the ISA tunes available in oe-core, even if
> that is just the tune features and not predefined tunes (e.g. like
> microblaze).

I think this idea as well. Some generic way of generating tunes from
ISA stings would be great!

Does anyone have any ideas on the best way to do this?

Alistair

>
> Regards,
> Nathan
>
> >
> > cu
> > Adrian
> >
> > --
> >
> >        "Is there not promise of rain?" Ling Tan asked suddenly out
> >         of the darkness. There had been need of rain for many days.
> >        "Only a promise," Lao Er said.
> >                                        Pearl S. Buck - Dragon Seed
> >
> > --
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