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Optimize popcount functions with ARM SVE intrinsics.

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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
This commit is contained in:
Nathan Bossart
2025-03-28 16:20:20 -05:00
parent 3c8e463b0d
commit 519338ace4
7 changed files with 475 additions and 6 deletions
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9
configure.ac
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@ -2070,6 +2070,15 @@ if test x"$host_cpu" = x"x86_64"; then
fi
fi
# Check for SVE popcount intrinsics
#
if test x"$host_cpu" = x"aarch64"; then
PGAC_SVE_POPCNT_INTRINSICS()
if test x"$pgac_sve_popcnt_intrinsics" = x"yes"; then
AC_DEFINE(USE_SVE_POPCNT_WITH_RUNTIME_CHECK, 1, [Define to 1 to use SVE popcount instructions with a runtime check.])
fi
fi
# Check for Intel SSE 4.2 intrinsics to do CRC calculations.
#
PGAC_SSE42_CRC32_INTRINSICS()