[llvm-dev] Opt vs Clang

[Johannes Doerfert via llvm-dev]

The opt flag does prevent opt from printing/saving the resulting IR. opt
will instead asks the passes to "print" a summary of what they did.

The clang flag enables and saves remarks
(https://clang.llvm.org/docs/UsersManual.html#options-to-emit-optimization-reports)
Remarks are printed by some passes while they perform their actions.



On 03/12, Ashwin Jose via llvm-dev wrote:
> What is the difference between the report generated by clang's
> -fsave-optimization-record flag and opt's -analyze flag?

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-- 

Johannes Doerfert
Researcher

Argonne National Laboratory
Lemont, IL 60439, USA

jdoerfert at anl.gov
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