GCD project status?

[Torbjörn Granlund]

We now have almost complete results for the latest hgcd2.c tweaks.

We have 5 div1 variants (as chosen by HGCD2_DIV1_METHOD).  There are
results and brief documentation here:

https://gmplib.org/devel/thres/HGCD2_DIV1_METHOD.html

About half of our test machines prefer '/', i.e., whatever word division
the compiler comes up with.  About one quarter prefers method 3, which
handles n / d < 8 with plain and branch-free code, but '/' for greater
divisors.  About one quarter prefers table-driven inverse-and-multiply,
which is in practice branch-free.

The even-numbered methods are clearly unpopular.

-- 
Torbjörn
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