| From: | David Rowley <dgrowleyml(at)gmail(dot)com> |
|---|---|
| To: | Nathan Bossart <nathandbossart(at)gmail(dot)com> |
| Cc: | Ants Aasma <ants(dot)aasma(at)cybertec(dot)at>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, "Amonson, Paul D" <paul(dot)d(dot)amonson(at)intel(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Andres Freund <andres(at)anarazel(dot)de>, "Shankaran, Akash" <akash(dot)shankaran(at)intel(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, Matthias van de Meent <boekewurm+postgres(at)gmail(dot)com>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Popcount optimization using AVX512 |
| Date: | 2024-04-05 23:08:14 |
| Message-ID: | CAApHDvrqVoduZRNTct5yn_6e=i7TkqhzSxt96WQQDxEkgdGeWg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Sat, 6 Apr 2024 at 04:38, Nathan Bossart <nathandbossart(at)gmail(dot)com> wrote:
> This seems to provide a small performance boost, so I've incorporated it
> into v27.
Won't Valgrind complain about this?
+pg_popcount_avx512(const char *buf, int bytes)
+ buf = (const char *) TYPEALIGN_DOWN(sizeof(__m512i), buf);
+ val = _mm512_maskz_loadu_epi8(mask, (const __m512i *) buf);
David
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