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Posted to issues-all@impala.apache.org by "Daniel Becker (Jira)" <ji...@apache.org> on 2023/04/24 12:04:00 UTC
[jira] [Updated] (IMPALA-12086) Fix BitUtil::CountLeadingZeros for zero
[ https://issues.apache.org/jira/browse/IMPALA-12086?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Daniel Becker updated IMPALA-12086:
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Description: BitUtil::CountLeadingZeros uses {{builtin_clz()}} and {{_builtin_clzll()}} to return the number of zeros in a value. Calling these functions with 0 is undefined, so CountLeadingZeros should check for zero and only call these functions if the argument is non-zero. (was: BitUtil::CountLeadingZeros uses {{__builtin_clz()}} and {{__builtin_clzll() }}to return the number of zeros in a value. Calling these functions with 0 is undefined, so CountLeadingZeros should check for zero and only call these functions if the argument is non-zero.)
> 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, so CountLeadingZeros should check for zero and only call these functions if the argument is non-zero.
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