postgres

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Nathan Bossart 519338ace4 Optimize popcount functions with ARM SVE intrinsics.

This commit introduces SVE implementations of pg_popcount{32,64}.
Unlike the Neon versions, we need an additional configure-time
check to determine if the compiler supports SVE intrinsics, and we
need a runtime check to determine if the current CPU supports SVE
instructions.  Our testing showed that the SVE implementations are
much faster for larger inputs and are comparable to the status
quo for smaller inputs.

Author: "Devanga.Susmitha@fujitsu.com" <Devanga.Susmitha@fujitsu.com>
Co-authored-by: "Chiranmoy.Bhattacharya@fujitsu.com" <Chiranmoy.Bhattacharya@fujitsu.com>
Co-authored-by: "Malladi, Rama" <ramamalladi@hotmail.com>
Reviewed-by: John Naylor <johncnaylorls@gmail.com>
Reviewed-by: Kirill Reshke <reshkekirill@gmail.com>
Discussion: https://postgr.es/m/010101936e4aaa70-b474ab9e-b9ce-474d-a3ba-a3dc223d295c-000000%40us-west-2.amazonses.com
Discussion: https://postgr.es/m/OSZPR01MB84990A9A02A3515C6E85A65B8B2A2%40OSZPR01MB8499.jpnprd01.prod.outlook.com

2025-03-28 16:20:20 -05:00

ax_pthread.m4

Update config/ax_pthread.m4 to latest upstream version.

2018-11-19 15:05:33 -05:00

c-compiler.m4

Optimize popcount functions with ARM SVE intrinsics.

2025-03-28 16:20:20 -05:00

c-library.m4

Simplify checking for xlocale.h

2024-10-01 07:23:45 -04:00

check_decls.m4

Fix configure's AC_CHECK_DECLS tests to work correctly with clang.