Re: Use compiler intrinsics for bit ops in hash

On Fri, Jan 31, 2020 at 04:59:18PM +0100, David Fetter wrote:
> On Wed, Jan 15, 2020 at 03:45:12PM -0800, Jesse Zhang wrote:
> > On Tue, Jan 14, 2020 at 2:09 PM David Fetter <david(at)fetter(dot)org> wrote:
> > > > The changes in hash AM and SIMPLEHASH do look like a net positive
> > > > improvement. My biggest cringe might be in pg_bitutils:
> > > >
> > > > 1. Is ceil_log2_64 dead code?
> > >
> > > Let's call it nascent code. I suspect there are places it could go, if
> > > I look for them. Also, it seemed silly to have one without the other.
> > >
> >
> > While not absolutely required, I'd like us to find at least one
> > place and start using it. (Clang also nags at me when we have
> > unused functions).
>
> Done in the expanded patches attached.

These bit-rotted a little, so I've updated them.

Best,
David.
--
David Fetter <david(at)fetter(dot)org> http://fetter.org/
Phone: +1 415 235 3778

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