[llvm-bugs] [Bug 35110] New: [LazyCallGraph][Inliner] Large compile-time slow down when using new pass manager
llvm-bugs at lists.llvm.org
Fri Oct 27 12:52:53 PDT 2017
Bug ID: 35110
Summary: [LazyCallGraph][Inliner] Large compile-time slow down
when using new pass manager
OS: Windows NT
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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