divappr tests

[Niels Möller]

Torbjorn Granlund <tg at gmplib.org> writes:

> I think you slightly pessimises things by no longer keeping the top
> remainder limb in a register.  I very carefully optimized that code,
> including that aspect.

I don't think I changed that. It's just for the final case, just before
returning, where I do

   udiv_qr_3by2 (q, np[1], np[0], n1, np[1], np[0], d1, d0, dinv);

rather than

   udiv_qr_3by2 (q, n1, n0, n1, np[1], np[0], d1, d0, dinv);
   np[1] = n1;
   np[0] = n0;

The macro uses temporaries _r1 and _r0 and does the copying at the end.
If this change affects register allocation I don't know, but at least
the operations and values should be identical.

Regards,
/Niels

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