Re: add AVX2 support to simd.h

John Naylor <johncnaylorls@gmail.com>

From: John Naylor <johncnaylorls@gmail.com>

To: Nathan Bossart <nathandbossart@gmail.com>

Cc: Ants Aasma <ants@cybertec.at>, pgsql-hackers@postgresql.org

Date: 2024-01-05T02:03:39Z

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 →

Improve style of pg_lfind32().
- 7188a7806d20 17.0 landed
Fix compiler warning for pg_lfind32().
- 1f42337be535 17.0 landed
Micro-optimize pg_lfind32().
- 7644a7340c8a 17.0 landed
Introduce helper SIMD functions for small byte arrays
- 9f225e992bed 17.0 cited
Optimize xid/subxid searches in XidInMVCCSnapshot().
- 37a6e5df3713 16.0 cited

On Wed, Jan 3, 2024 at 10:29 PM Nathan Bossart <nathandbossart@gmail.com> wrote:
> If the requirement is that normal builds use AVX2, then I fear we will be
> waiting a long time.  IIUC the current proposals (building multiple
> binaries or adding a configuration option that maps to compiler flags)
> would still be opt-in,

If and when we get one of those, I would consider that  a "normal"
build. Since there are no concrete proposals yet, I'm still waiting
for you to justify imposing an immediate maintenance cost for zero
benefit.