mpz reuse test takes too much time

[Niels Möller]

tg at gmplib.org (Torbjörn Granlund) writes:

> Please check that reuse.c whacks gcdext appropriately.

It doesn't check the cases where both input operands overlap some output
operands, e.g.,

	  mpz_gcdext (res1, res2, res3, res1, res3);

or

	  mpz_gcdext (res1, res2, res3, res2, res2);

Should it do that, or is it enough that the reuse tests overlap one
operand at a time? Doing all combinations everywhere does blow up the
number of tests a bit.

/Niels

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