[Bug target/94538] [10 Regression] ICE: in extract_constrain_insn_cached, at recog.c:2223 (insn does not satisfy its constraints) with -mcpu=cortex-m23 -mslow-flash-data

[wilco at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94538

--- Comment #7 from Wilco <wilco at gcc dot gnu.org> ---
(In reply to Wilco from comment #4)
> (In reply to Zdenek Sojka from comment #3)
> > (In reply to Wilco from comment #2)
> > > This was introduced by commit e24f6408d so only in GCC10.
> > 
> > Thank you for checking this!
> > 
> > I am quite sure this fails in gcc-9 as well:
> ...
> > Perhaps the offending commit, or part of it, was backported to gcc-9 as well?
> 
> It's possible it was recently backported and our GCC9 builds don't yet have
> it. But that whole patch is badly broken and introduces multiple issues...

Adding Christophe. I'm thinking the best approach right now is to revert given
-mpure-code doesn't work at all on Thumb-1 targets - it still emits literal
pools, switch tables etc. That's not pure code!