Re: [PATCH] Turn on LRA on all targets

[Uros Bizjak <ubizjak@gmail.com>]

On Sun, Apr 23, 2023 at 6:48 PM Segher Boessenkool
<segher@kernel.crashing.org> wrote:
>
> This minimal patch enables LRA for all targets.  It does not clean up
> the target code, nor does it do anything to generic code: it just
> deletes all target definitions of TARGET_LRA_P.
>
> There are three kinds of changes:
>
> 1) Targets that already always have LRA, but that redefine the hook
> anyway.  These are gcn, pdp11, rx, sparc, vax, and xtensa.  Nothing
> really changes for these targets with this patch (but later patches
> will delete the superfluous hook implementations).
> 2) Targets that have LRA selectable.  Some of those are probably fine,
> since they default to using LRA (arc, mips, s390).  Two others don't
> though, maybe because there are problems (ft32 and sh).  I'd love to
> hear from all targets in this category what the status is, how easy it
> was to convert, etc.
> 3) Targets that as of yet never used LRA.  Many of those will be fine,
> but some others will need a little tuning, and a few might need some
> actual improvements to LRA itself.  These are cris, epiphany, fr30,
> frv, h8300, ia64, iq2000, lm32, m32c, m32r, m68k, mcore, microblaze,
> mmix, mn10300, msp430, nvptx, pa, rl78, stormy16, and visium.  We'll
> find out how many of those targets are ever tested, and how many of
> those work with LRA without further changes, and how well.
>
> I send this patch now so that people can start testing.  I don't plan to
> commit this for another week at least, for a week after GCC 13 release I
> guess?  How does that plan sound to people?

An old patch to enable Alpha is at

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66207

Uros.