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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/05/16 10:51:52 UTC

[GitHub] [arrow] cyb70289 commented on a diff in pull request #13112: ARROW-16478: [C++] Refine cpu info detection

cyb70289 commented on code in PR #13112:
URL: https://github.com/apache/arrow/pull/13112#discussion_r873586429


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cpp/src/parquet/level_conversion.cc:
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@@ -137,7 +137,9 @@ void DefLevelsToBitmap(const int16_t* def_levels, int64_t num_def_levels,
   // is deleted in a follow-up release.
   if (level_info.rep_level > 0) {
 #if defined(ARROW_HAVE_RUNTIME_BMI2)
-    if (CpuInfo::GetInstance()->HasEfficientBmi2()) {
+    const CpuInfo* ci = CpuInfo::GetInstance();
+    // BMI2 (pext, pdep) is only efficient on Intel X86 processors.

Review Comment:
   Restored `HasEfficientBmi2`.



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