[kuro68k]

I don't buy it. If you need to shave some bytes the first thing you do is look at the map file or run a binary analysis tool to figure out what the best candidates for optimisation are.

And if your performance is poor the first thing you do is add some debug code to measure what is taking too long and where the biggest gains can be made.

The whole point of these tools is to make this stuff easy to find.