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

[Weddington, E. <Eri...@at...>]

We could probably do the same as AVR GCC for now. I'll check with some other people to see what would perhaps be the most ideal. 

> -----Original Message-----
> From: John Myers [mailto:ato...@gm...] 
> Sent: Wednesday, November 03, 2010 6:20 PM
> To: Borja Ferrer
> Cc: avr...@li...
> Subject: Re: [avr-llvm-devel] Load / Store
> 
> 
> 	- 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.
> 
> 
>