The bug is in your mpir_bincoef subroutine where you use a routine that
returns a double as follows:
ret = mpz_get_d(result);
to set a 64-bit value in ret:
Since a double on Windows has a 53 bit mantissa, this will give wrong
values for 64-bit values with longer bit lengths than this.
If you add:
#include <stdint.h>
to the file and then replace the above line with
ret = mpz_get_ux(result);
it will, I think, work as expected.
Brian
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