Re: [avr-gcc-list] register allocation - something not right

[Russell Shaw]

address@hidden wrote:
> I'll create a patch when I've added some more meat to the improvements.
>
> Those that cant wait can try replacing "order_2" definition about line 4766 in 
> avr.c  with
>
>  static const int order_2[] = {
>     22,23,
>     24,25,
>     18,19,
>     20,21,
>     26,27,
>     30,31,
>     16,17,
>     2,3,4,5,6,7,8,9,10,11,12,13,14,15,
>     28,29,
>     1,0,
>     32,33,34,35
>   };
>
>
> and rebuilding (make install).
> This is the register allocation order for the compile option -morder2.

-morder doesn't seem to be a listed compiler switch (man avr-gcc).

> So nothing will or should happen unless you add that as a compile option in your make file. Makes 
it easy to compare results.
> Note library routines wont be affected unless you re-create libgcc etc.
>
> Please post improvements (or otherwise!). The change will favor large operands 
> such as longs and floats so pls indicate what flavor of code you are using.