Horton

Re: add AVX2 support to simd.h

Nathan Bossart <nathandbossart@gmail.com>

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From: Nathan Bossart <nathandbossart@gmail.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: John Naylor <johncnaylorls@gmail.com>, Ants Aasma <ants@cybertec.at>, pgsql-hackers@postgresql.org
Date: 2024-03-27T01:36:16Z
Lists: pgsql-hackers

Commits

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  1. Improve style of pg_lfind32().

  2. Fix compiler warning for pg_lfind32().

  3. Micro-optimize pg_lfind32().

  4. Introduce helper SIMD functions for small byte arrays

  5. Optimize xid/subxid searches in XidInMVCCSnapshot().

On Tue, Mar 26, 2024 at 06:55:54PM -0500, Nathan Bossart wrote:
> On Tue, Mar 26, 2024 at 07:28:24PM -0400, Tom Lane wrote:
>> A significant fraction of the buildfarm is issuing warnings about
>> this.
> 
> Thanks for the heads-up.  Will fix.

Done.  I'll keep an eye on the farm.

I just did the minimal fix for now, i.e., I moved the new label into the
SIMD section of the function.  I think it would be better stylistically to
move the one-by-one logic to an inline helper function, but I didn't do
that just in case it might negatively impact performance.  I'll look into
this and will follow up with another patch if it looks good.

-- 
Nathan Bossart
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