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Posted to jira@arrow.apache.org by "Krisztian Szucs (Jira)" <ji...@apache.org> on 2021/10/18 10:34:00 UTC

[jira] [Created] (ARROW-14361) [C++] Define a MAX default value for ARROW_SIMD_LEVEL

Krisztian Szucs created ARROW-14361:
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             Summary: [C++] Define a MAX default value for ARROW_SIMD_LEVEL
                 Key: ARROW-14361
                 URL: https://issues.apache.org/jira/browse/ARROW-14361
             Project: Apache Arrow
          Issue Type: New Feature
          Components: C++
            Reporter: Krisztian Szucs
             Fix For: 7.0.0


In order to enable {{ARROW_HAVE_NEON}} CMake flag on ARM architectures {{ARROW_SIMD_LEVEL}} option must be set to not {{"NONE"}}, see https://github.com/apache/arrow/blob/master/cpp/cmake_modules/SetupCxxFlags.cmake#L444

The default value for {{ARROW_SIMD_LEVEL}} is {{SSE4_2}} which is a bit misleading on ARM64, it should rather be {{NEON}} which is not listed as a valid option for {{ARROW_SIMD_LEVEL}}. We may have a {{"MAX"}} default value similarly to the  {{ARROW_RUNTIME_SIMD_LEVEL}} option, see https://github.com/apache/arrow/blob/master/cpp/cmake_modules/DefineOptions.cmake#L115

Original github comment: https://github.com/apache/arrow/pull/11433#discussion_r729852835

cc [~yibocai] [~apitrou] 



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