https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115817

--- Comment #6 from Dmytro Bagrii <dimich.dmb at gmail dot com> ---
(In reply to Georg-Johann Lay from comment #5)

Thank you for explanation.

> LDI cannot be used since it only allows R16...R31.

I meant do not treat 0 as a special value and use LDI R24,0x00 The same as for
other values.
Now I see it requires GCC to treat ISR code generation as a special case on
another level, which is not implemented.

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