Date: Tue, 30 Jul 2024 22:01:50 -0500
From: Nathan Bossart <nathandbossart@gmail.com>
To: Andres Freund <andres@anarazel.de>
Cc: "Devulapalli, Raghuveer" <raghuveer.devulapalli@intel.com>,
	"Shankaran, Akash" <akash.shankaran@intel.com>,
	Tom Lane <tgl@sss.pgh.pa.us>, David Rowley <dgrowleyml@gmail.com>,
	Ants Aasma <ants.aasma@cybertec.at>,
	Alvaro Herrera <alvherre@alvh.no-ip.org>,
	"Amonson, Paul D" <paul.d.amonson@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>
Subject: Re: Popcount optimization using AVX512
Message-ID: <ZqmpHjuDlJSjoZVT@nathan>
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On Tue, Jul 30, 2024 at 07:43:08PM -0700, Andres Freund wrote:
> On 2024-07-30 21:01:31 -0500, Nathan Bossart wrote:
>> The main purpose of the XSAVE compiler check is to determine whether we
>> need to add -mxsave in order to use _xgetbv() [0].  If that wasn't a
>> factor, we could probably skip it.  Earlier versions of the patch used
>> inline assembly in the non-MSVC path to call XGETBV, which I was trying to
>> avoid.
> 
> My point is that _xgetbv() is made available by -mavx512vpopcntdq -mavx512bw
> alone, without needing -mxsave:

Oh, I see.  I'll work on a patch to remove that compiler check, then...

-- 
nathan