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Asked: 2026-05-27T16:59:23+00:00

I was reading through this document http://llvm.org/docs/WritingAnLLVMPass.html , where in I came across CallGraphSCCPass

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I was reading through this document http://llvm.org/docs/WritingAnLLVMPass.html, where in I came across CallGraphSCCPass. I searched for SCC abbreviation, but wasn’t able to find one. What does SCC stand for? Where can I read more about it?

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  1. Editorial Team

    According to The LLVM Lexicon, It stands for “strongly connected component“.

    The source-code comments explain it this way:

    Because there may be cycles in the call graph, passes of this type operate on the call-graph in SCC order: that is, they process function bottom-up, except for recursive functions, which they process all at once.

    (But the only reason I was able to find the lexicon is that I figured out that they must mean “strongly connected component”, and then I Googled for that phrase on site:llvm.org to confirm. It doesn’t seem to be prominently linked.)

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