div_qr_1 interface

[Niels Möller]

Torbjorn Granlund <tg at gmplib.org> writes:

> nisse at lysator.liu.se (Niels Möller) writes:
>
>   These sizes aren't exercised by div_qr_1.
>
> The plain test code?  Then I suppose it should be fixed...

I think t-div calls mpn_div_qr_1 for all reasonable small sizes. But
that function doesn't always call mpn_div_qr_1n_pi1, depending on
thresholds, and the up-front handling of the high quotient limb.

Separate tests for mpn_div_qr_1n_pi1 would be needed to improve
coverage.

/Niels
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