Re:Assembly coding on 68k
The compilers on Amiga and AROS for 68k suck rotten eggs. They generate terrible code, in other words. I write code in C and AmigaE but still there's no way to get sensible results without inline Assembly. If writing chipset specific code, the portions that happen in the main loop should be hand-tuned even if the first draft was in a high level language.
I have Hollywood 6.0 but I wouldn't think of using it for a 68k Amiga because it compiles just-in-time. If I were going to target 68k, I'd require ahead-of-time (load-time on user's machine) or static (on developer's machine) compilation or some combination of the two.