GCC global, local, register variables

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Hi All,

Is there some general advice about minimizing code space via global, local, or register variables in GCC AVR.

I'd like to use register variables but I can't find any info on which are free to use and which shouldn't be touched...

I scanned the Atmel app note on efficient C coding but some of their tricks don't work namely to put things in structures rather than individual variables. This actually produced larger code.

TIA,

Chris