> The port don't have to disable subregs in legitimate_address_p.

They don't have not to disable them either, they do what's better for them.

> So, the current avr_legitimate_address_p is correct.

It's just making impossible to compile some code.

> May be it's GCC core bug ?

It's more of a reload limitation, it cannot find any spill register.

-- 
Eric Botcazou

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