Not for games and other user facing software. Development effort is finite and the extra complexity that users (reasonably) now expect is worth more than another 10% performance.
The places where it has made economic sense for me to optimise has been high volume consumer electronics. In those cases, taking up a bit less code space means you can drop to a smaller sized flash part and save 30 cents on a $20 bill of materials (for example).
The places where it has made economic sense for me to optimise has been high volume consumer electronics. In those cases, taking up a bit less code space means you can drop to a smaller sized flash part and save 30 cents on a $20 bill of materials (for example).