You would like to return doubles to d0/d1 in any case, right ?
Right.
- Returning to fp0 is a bit faster. But since most of the stuff should be inlined, does it matter ?
Usually, the safer solution is the best...
Exactly. And it isn't that faster, as you mention, important stuff is inlined and one fmove wont hurt anybody.
Thanks for explanation of math-68881.h, it does seem like a good idea to include, I agree.