| From: | "Amonson, Paul D" <paul(dot)d(dot)amonson(at)intel(dot)com> |
|---|---|
| To: | Nathan Bossart <nathandbossart(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, David Rowley <dgrowleyml(at)gmail(dot)com>, "Andres Freund" <andres(at)anarazel(dot)de>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, "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: | 2024-03-29 17:25:14 |
| Message-ID: | BL1PR11MB5304D41D49B56986097713AFDC3A2@BL1PR11MB5304.namprd11.prod.outlook.com |
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| Lists: | pgsql-hackers |
> A counterexample is the CRC32C code. AFAICT we assume the presence of
> CPUID in that code (and #error otherwise). I imagine its probably safe to
> assume the compiler understands CPUID if it understands AVX512 intrinsics,
> but that is still mostly a guess.
If AVX-512 intrinsics are available, then yes you will have CPUID. CPUID is much older in the hardware/software timeline than AVX-512.
Thanks,
Paul
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