Re: sparc64 changes and generic backend patches

[Richard Henderson <rth at cygnus dot com>]

> > Sun May  3 14:31:16 1998  Richard Henderson               
> >
> >         * reload.c (find_reloads): Don't prohibit reloading into registers
> >         smaller than the word size.                                        
>
> If you do that, you have to make sure that subregging works for these
> kinds of reloads.                                                       

I don't think I understand what you are getting at.  What sort of RTL
are you thinking of?  The case I am trying to solve is as simple as

	(set (reg:SF $f0) (reg:SF 1234))

> This looks to me like you have to change subregging to count addressable
> units instead of words.  That'll be a lot of changes, but sooner or
> later we need them anyways, IMO.

Yes, Jim and I have discussed this problem before.  It will take
a lot of work, but it should be done eventually.  In the mean time
I think I'll have to turn on CLASS_CANNOT_CHANGE_SIZE for the Sparc
FP regs so as to avoid some subregging problems that yet remain.

> You should probably try to coordinate with Richard Kenner to avoid a   
> split on this issue.

I suppose.  Though with the large-scale changes (warning fixes, genrtl)
we already have installed, it would seem we are already approching the
practical limit on sane merging.


r~