[avr-gcc-list] Using register r0 and r1

[Ram Kumar Rengaswamy]

Hi,
     I am using registers r0 and r1 in a custom assembly routine  
within a large C application.
I save and restore r0 and r1 at the beginning and end of my routine.
I have a lot of interrupts in my application. Do the interrupts save  
and restore r0 and r1 as well (if they use them ?).
Also I read that r1 is assumed to be zero by all C code. Do the  
interrupt handlers explicitly save and clear r1 prior to using them ?

Thanks,
-Ram