[cfe-dev] how does clang control whether the unroll-loop pass work or not by default?

[Michael Kruse via cfe-dev]

For the legacy pass manager (the default), the code can be found in
lib/Transforms/IPO/PassManagerBuilder.cpp, function
PassManagerBuilder::populateModulePassManager

Michael

Am Do., 26. März 2020 um 08:03 Uhr schrieb 林政宗 via cfe-dev
<cfe-dev at lists.llvm.org>:
>
> Hi, there.
>
> I want to figure out how the unroll-loop pass is controlled by clang. which option or struct in the source code tell the unroll-loop pass to work or not to work?
> include/clang/Basic/CodeGenOptions.def
> ----------------------------------------------------------------------------------------
> CODEGENOPT(UnrollLoops       , 1, 1) ///< Control whether loops are unrolled.
> -----------------------------------------------------------------------------------------
> I tried to modify the above option. The second "1" is "0" initially. I modified the original "0" to "1". But clang would do the unroll-loop pass whether it is "0" or "1".
> I wonder how clang instructs the unroll-loop pass to work or not to work?
>
> Thanks,
> Jerry
>
>
>
>
>
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