[jira] [Work started] (IMPALA-12314) Revisit pre-compiled IR at O1

["Michael Smith (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-12314?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on IMPALA-12314 started by Michael Smith.
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> Revisit pre-compiled IR at O1
> -----------------------------
>
>                 Key: IMPALA-12314
>                 URL: https://issues.apache.org/jira/browse/IMPALA-12314
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Backend
>            Reporter: Michael Smith
>            Assignee: Michael Smith
>            Priority: Major
>
> From https://github.com/apache/impala/blob/4.2.0/be/CMakeLists.txt#L298-L300
> {quote}
> We enable basic optimizations (-O1) to reduce the IR size and speed up runtime JIT. Empirically, the runtime JIT produces slightly better code when starting with IR that was optimized at -O1. Higher optimization levels tend to bloat the code.
> {quote}
> This evaluation was done with LLVM 3.3. We're now on LLVM 5, and this evaluation may no longer hold. Revisit whether this makes sense or whether another option (O2, Os, O3) may make more sense.



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