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

[HutchinsonAndy]

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. 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.






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