Frame pointer using more than one register

[Richard Henderson]

> My question is - are there any other places like this, where GCC
> assumes (which is correct for most other targets, but wrong for AVR)
> that the frame pointer is a single hard register?

Almost certainly.

> If yes, it may be safer to change avr_hard_regno_mode_ok() to
> disallow QImode in r29 for now, to avoid similar bugs in the future...

Seems a reasonable workaround.


r~