mpn_add or mpn_add_n+MPN_COPY+MPN_INCR_U ?
tg at gmplib.org
Sun Jun 15 12:47:01 UTC 2014
nisse at lysator.liu.se (Niels Möller) writes:
Looks like mpn_add_n is an inline function defined in terms of
__GMP_AORS, which does carry propagation differently. With an inline
mpn_add, there's no good reason for it to have more overhead than
mpn_add_N + MPN_COPY + mpn_incr_u.
A critical typo there, you surely mean "Looks like mpn_add is an inline
> I'm tempted to substitute some mpn_add_1 in the code with COPY+INCR, or to
> write a new macro NOCARRY_MPN_ADD...
To me, the right way seems to be to improve the existing macrology used
I am sure these old things can be improved.
One reason for how the current mpn_add is implemented is that it is done
gmp.h and not gmp-impl.h. We thereby don't have access to the MPN_COPY*
Perhaps we could supply different mpn_add/mpn_sub in gmp-impl.h, but
then again we should perhaps not use these internally, since they might
hide optimisation opportuneties.
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