Horton

Re: Popcount optimization using AVX512

Alvaro Herrera <alvherre@alvh.no-ip.org>

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From: Alvaro Herrera <alvherre@alvh.no-ip.org>
To: "Amonson, Paul D" <paul.d.amonson@intel.com>
Cc: Nathan Bossart <nathandbossart@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>, David Rowley <dgrowleyml@gmail.com>, Andres Freund <andres@anarazel.de>, "Shankaran, Akash" <akash.shankaran@intel.com>, Noah Misch <noah@leadboat.com>, Matthias van de Meent <boekewurm+postgres@gmail.com>, "pgsql-hackers@lists.postgresql.org" <pgsql-hackers@lists.postgresql.org>
Date: 2024-03-28T22:10:33Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Fix __attribute__((target(...))) usage.

  2. Use __attribute__((target(...))) for AVX-512 support.

  3. Fix code for probing availability of AVX-512.

  4. Optimize visibilitymap_count() with AVX-512 instructions.

  5. Optimize pg_popcount() with AVX-512 instructions.

  6. Inline pg_popcount() for small buffers.

  7. Avoid function call overhead of pg_popcount() in syslogger.c.

  8. Refactor code for setting pg_popcount* function pointers.

  9. Inline pg_popcount{32,64} into pg_popcount().

  10. Remove MSVC scripts

  11. Use ARMv8 CRC instructions where available.

  12. Use Intel SSE 4.2 CRC instructions where available.

On 2024-Mar-28, Amonson, Paul D wrote:

> > -----Original Message-----
> > From: Nathan Bossart <nathandbossart@gmail.com>
> > Sent: Thursday, March 28, 2024 2:39 PM
> > To: Amonson, Paul D <paul.d.amonson@intel.com>
> > 
> > * The latest patch set from Paul Amonson appeared to support MSVC in the
> >   meson build, but not the autoconf one.  I don't have much expertise here,
> >   so the v14 patch doesn't have any autoconf/meson support for MSVC, which
> >   I thought might be okay for now.  IIUC we assume that 64-bit/MSVC builds
> >   can always compile the x86_64 popcount code, but I don't know whether
> >   that's safe for AVX512.
> 
> I also do not know how to integrate MSVC+Autoconf, the CI uses
> MSVC+Meson+Ninja so I stuck with that.

We don't do MSVC via autoconf/Make.  We used to have a special build
framework for MSVC which parsed Makefiles to produce "solution" files,
but it was removed as soon as Meson was mature enough to build.  See
commit 1301c80b2167.  If it builds with Meson, you're good.

-- 
Álvaro Herrera               48°01'N 7°57'E  —  https://www.EnterpriseDB.com/
"[PostgreSQL] is a great group; in my opinion it is THE best open source
development communities in existence anywhere."                (Lamar Owen)