Re: [avr-llvm-devel] Load / Store

[John M. <ato...@gm...>]

> - If ptrs were 8 bits we could have a reg class with r26, r28 and r30 for
> st/ld and the compiler would be able to choose between this class what reg
> to use. However we have to stick with reg pairs so we have to think how to
> overcome this, if we dont use reg classes will we have to decide which pair
> has to be used manually in each operation??.
> Also notice that we should try to avoid using X to access struct members or
> whatever because it doesnt support doing "X+<offs>" so we have to see how to
> handle different addressing modes, favouring Y or Z in such cases etc.
>

The avr-gcc ABI uses the Y ptr for the stack frame so that would leave the Z
ptr as the favored pointer.