[Bug target/79058] [7 Regression] ARM: internal compiler error: in extract_constrain_insn, at recog.c:2213

["vmakarov at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79058

--- Comment #28 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
(In reply to Vladimir Makarov from comment #27)
> (In reply to Vladimir Makarov from comment #26)
> > (In reply to Dominik Vogt from comment #24)
> > > While you're at it ... does it have the same or a similar cause as the Avr
> > > bug?
> > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78883
> > > 
> > > (A HImode quantity got allocated to r31+r32 (r31 is the last hardreg), in
> > > presence of a paradoxical subreg of memory.)
> > 
> > It might be.
> 
> Sorry, I was wrong.  The problem is still present for AVR.  I'll look at the
> AVR PR.  It seems an IRA problem too.

AVR still uses the old reload pass and this is its problem (I wrongly jumped to
the conclusion of about the IRA problem when I saw no output from LRA with
-fira-verbose=12).  I am not an expert of the old reload to be a help with this
AVR PR.