[LLVMbugs] [Bug 18955] New: Infinite loop in AlwaysInliner pass

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18955

            Bug ID: 18955
           Summary: Infinite loop in AlwaysInliner pass
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Interprocedural Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: anthony.louis.eden at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Attached is a tarball of two LLVM code modules which are nearly identical. When
running

opt -O2 -o bad.bc bad.ll

opt rapidly consumes GiB's of memory and seems to run indefinitely (>10min).
When running

opt -O2 -o good.bc good.ll

opt exits quickly. The difference between the two modules is 599 removals of
the alwaysinline function attribute; therefore I believe the problem is in the
AlwaysInliner pass. I also wrote code to only run the AlwaysInliner pass, and
that produced the same result.

I have also experimentally observed this bug in the LLVM 3.4 and LLVM 3.0
releases.

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