user42 at zip.com.au
Wed Oct 29 07:14:40 CET 2003
David McKen <cic_3_b at yahoo.com> writes:
> From what I understand function pointers are faster than having an
> if..then..else statement that would be evaluated every time an
> iteration occours.
Actually, some chips don't branch predict an indirect call, so you
might find the conditional a few cycles faster, if the condition is
non-random and hence amenable to branch prediction. Probaby too small
to measure the difference though. :)
> My question is looking at the results of the profiler can anyone
> suggest anything that might further speed up my program.
You can call mpn_modexact_1_odd instead of reaching mpn_mod_1, if you
don't mind getting into some undocumented/unsupported/etc internals.
remainder = __gmpn_modexact_1c_odd (up_counter->_mp_d,
More information about the gmp-discuss