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

[林政宗 via cfe-dev]

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

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CODEGENOPT(UnrollLoops       , 1, 1) ///< Control whether loops are unrolled.
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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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