Tim,
I think you are right, I answered too quickly. I'm still going on memory (having failed to learn from experience not to trust it :-), but I think bn math is only accessed via a debugflag switch, and then only a few fractal rtypes (mandelbrot/julia) that were implemented using it. I think it turned out there was no real need for bn math API, though in theory it was a bit faster than bf math.
Does that sound right?
Yes, up until the point where you added the USEBN define to fractalp.c. Perhaps you added it to test the bn math and forgot to comment it out before you committed the changes.
At any rate, we need to have it commented out so that WinFract can use the ap math for the mandel and julia types.
Except... Xfractint needs to use the bn math. I'll see if I can figure out how to get WinFract to use the bn math. Jonathan