Heh, heh! DOOM eh??
Doom does NOT use an FPU! The original never did and neither does any Amiga port. The game is written to use fixed point math not floats.
And why you'd want to play a lame Amiga port at 320x200 at about 5-10fps on an 030 when you can play GLDoom / ZDoom / prBoom on a PC/Mac at 1280x1024 75fps I dunno, you'd have to be BONKERS!