Re: speed up unicode normalization quick check

On Wed, Oct 07, 2020 at 03:18:44PM +0900, Michael Paquier wrote:
I looked at this one again today, and applied it.  I looked at what
MSVC compiler was able to do in terms of optimizationswith
shift-and-add for multipliers, and it is by far not as good as gcc or
clang, applying imul for basically all the primes we could use for the
perfect hash generation.

> I have tested 0002 and 0003, that had better be merged together at the
> end, and I can see performance improvements with MSVC and gcc similar
> to what is being reported upthread, with 20~30% gains for simple
> data sample using IS NFC/NFKC.  That's cool.

For these two, I have merged both together and did some adjustments as
per the attached.  Not many tweaks, mainly some more comments for the
unicode header files as the number of structures generated gets
higher.