On Sun, May 8, 2016 at 7:46 PM, Thomas Munro
<thomas.munro@enterprisedb.com> wrote:
> My aim with this thread was mainly reducing code duplication and
> needless code: perhaps at least the other ideas in the attached
> sketch, namely using ffs instead of the rightmost_one_pos table loop
> and consolidation of popcount into a reusable API (without trying to
> get hardware support) could be worth polishing for the next CF?
> Annoyingly, it seems Windows doesn't have POSIX/SUSv2 ffs, though
> apparently it can reach that instruction with MSVC intrinsic
> _BitScanReverse or MingW __builtin_ffs.
I think my_log2() is the same thing as one of ffs() and fls() - I can
never keep those straight. It seems like it wouldn't he hard to clean
things up at least that much.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
