[Bug target/115726] [avr] Wrong code with __memx and local register variables

[gjl at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115726

--- Comment #2 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #1)
> It seems to work on x86_64 for

It's an AVR issue and how avr.md::mov<mode> is expanding loads from 24-bit
address-space.