Re: [avr-gcc-list] Legal registers

[Russell Shaw]

Ron wrote:
> Hi All. Does it somewhere specify that avrgcc and its library routines
> should only use a subset of the AVR registers (say 0,1,18-31), or can
> the whole 32 be used if required? I ask because it would save a deal of
> pushing and popping in a preemptive os if you knew for sure register
> subset x would never be used.
>
> Ron Kreymborg

http://www.nongnu.org/avr-libc/user-manual/FAQ.html#faq_reg_usage