[llvm-bugs] [Bug 35110] New: [LazyCallGraph][Inliner] Large compile-time slow down when using new pass manager

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35110

            Bug ID: 35110
           Summary: [LazyCallGraph][Inliner] Large compile-time slow down
                    when using new pass manager
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Interprocedural Analyses
          Assignee: unassignedbugs at nondot.org
          Reporter: mcrosier at codeaurora.org
                CC: llvm-bugs at lists.llvm.org

While testing the new pass manager we identified a case where one input file
regressed in compile-time by ~548x.

The primary issue appears to be the call to
LazyCallGraph::RefSCC::insertTrivialRefEdge() in the Inliner.  If the verify()
call is removed from insertTrivialRefEdge() the regression is greatly reduced.

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