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This significantly improves performance when a number exceeds 2**(W_TYPE_SIZE - 1) and is the product of a prime less than FIRST_OMITTED_PRIME and another prime less than 2**(W_TYPE_SIZE - 1). On my platform, for example, it doubled the speed of factoring 4999 * (2**128 - 159). * src/factor.c (mp_size, mp_finish_in_single): New functions. (mp_factor_using_division, mp_factor_using_pollard_rho): Finish using single precision when possible. * tests/factor/factor.pl (lt-5000-times-128-bit): New test.