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Posted to issues-all@impala.apache.org by "Daniel Becker (Jira)" <ji...@apache.org> on 2023/04/24 12:26:00 UTC
[jira] [Work started] (IMPALA-12086) Fix BitUtil::CountLeadingZeros for zero
[ https://issues.apache.org/jira/browse/IMPALA-12086?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Work on IMPALA-12086 started by Daniel Becker.
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> Fix BitUtil::CountLeadingZeros for zero
> ---------------------------------------
>
> Key: IMPALA-12086
> URL: https://issues.apache.org/jira/browse/IMPALA-12086
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Reporter: Daniel Becker
> Assignee: Daniel Becker
> Priority: Major
> Fix For: Impala 4.3.0
>
>
> BitUtil::CountLeadingZeros uses {{builtin_clz()}} and {{_builtin_clzll()}} to return the number of zeros in a value. Calling these functions with 0 is undefined (see https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html), so CountLeadingZeros should check for zero and only call these functions if the argument is non-zero.
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