[avr-gcc-list] __udivmodsi4 uses r1

[Lin Gu]

Hi,

I find that __udivmodsi4 (implemented in libgcc.S) uses r1
to store a non-zero value. Is there a specific reason for this?

This usage somehow breaks one of my programs which assume
r1 is always zero. Though it's easy to fix my program, I am wondering
why here r1 is used this way.

Cheers,

lin
--
Lin Gu
University of Virginia