[RFC Patch], PowerPC memory support pre-gcc9, patch #1
Michael Meissner
meissner@linux.vnet.ibm.com
Tue Mar 20 20:35:00 GMT 2018
On Tue, Mar 20, 2018 at 08:01:57AM -0500, Segher Boessenkool wrote:
> Hi! Some comments...
>
> On Wed, Mar 14, 2018 at 06:54:08PM -0400, Michael Meissner wrote:
> > The first patch in the series moves most of the reg_addr structure from
> > rs6000.c to rs6000-protos.h, so that in the next patch, we can start splitting
> > some of the address code to other files.
>
> Is that the correct header? It currently contains only function
> prototypes, and the name indicates that is what it should be.
>
> > 1) I was playing with making r12 be fixed with a new option (not in this
> > set of patches), and I noticed it wasn't reflected in the -mdebug=reg
> > debug dump, due to the debug dump being done before the conditional
> > registers are setup. I made the debug dump set conditional registers.
>
> Various ABIs use r12 for various things. It's also used for split stack.
> Besides that it is available for programs to do with as they please.
>
> > I likely will remove the undocumented toc-fusion all together, and eventually
> > rework the p8/p9 fusion support.
>
> Did it ever give any performance improvement?
>
> > 2018-03-14 Michael Meissner <meissner@linux.vnet.ibm.com>
> > * config/rs6000/rs6000-protos.h (regno_or_subregno): Add
> > declaration.
>
> There is a generic reg_or_subregno, how does this differ? If we need
> it please change the name so the difference is clear.
>
> It is very hard to review these patches. Please do patches that only
> move or rename things, not changing functionality, as separate patches
> (usually before everything else).
Ok, but if you want me to shove everything back into rs6000.c that simplifies
things. Some of the artiface is to support the reg_addr stuff in multiple
locations.
--
Michael Meissner, IBM
IBM, M/S 2506R, 550 King Street, Littleton, MA 01460-6245, USA
email: meissner@linux.vnet.ibm.com, phone: +1 (978) 899-4797
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