Re: Remove traces of long in dynahash.c

On Thu, Aug 21, 2025 at 12:53:09AM -0400, Tom Lane wrote:
> If you prefer to regard this as an independent issue, that's okay with
> me ... but it's touching most of the same lines of code, so it seems
> to me that it'd be about as easy to deal with both items at once.

I'd rather do that after a second look at the whole picture as this
led to an accumulation of bullet points. The long->int64 switch was
looking OK on its own and I have applied it.

Attached is the second piece of refactoring, where I have introduced a
couple more APIs in pg_bitutils.h (cross-checked the resulting
computations of the old and new routines with some quick hacks, in
case, and they matched):
pg_nextpower2_32_bound, replacing next_pow2_int
pg_nextpower2_64_bound, replacing next_pow2_int64
pg_ceil_log2_64_bound, replacing my_log2()
pg_ceil_log2_32_bound, not used, present for symmetry.

An extra thing is a suggested change for pg_nextpower2_32(), to use a
uint64 instead of a uint32 as argument, which is caused by
next_pow2_int64() and next_pow2_int(), that both used int64
previously.

There's likely some opinion differences according to one's taste;
that's my idea of the refactoring to remove the duplication.
--
Michael