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

From: Ram Kumar Rengaswamy
Subject: [avr-gcc-list] Using register r0 and r1
Date: Tue, 12 Sep 2006 14:12:37 -0700

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 ?


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