I will answer your questions one at a time.
1. Yes it understands the scope and call positions of functions for the optimizations

2. Yes you can control the optimizations completely.

3. I understand this I was responding to the posters first question.

Bryan Whitton

erik malund wrote:
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1) Does the compressor "know" that a routine buried 4 levels deep from an interrupt can not be shared with a routine called from main();
2) can you flag the compressor to balance throughput and size to your liking (e.g. you want to save 211 bytes but not have too big an effect on throughput).
3) The only derivatives w/o movx, I recall are those that cannot access external data memory, and have no internal edata, so what would you want it for.

Have fun,

Erik