[llvm-bugs] [Bug 25897] New: MemoryDependenceAnalysis scales badly

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25897

            Bug ID: 25897
           Summary: MemoryDependenceAnalysis scales badly
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Global Analyses
          Assignee: unassignedbugs at nondot.org
          Reporter: joerg at NetBSD.org
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 15503
  --> https://llvm.org/bugs/attachment.cgi?id=15503&action=edit
Reduced test case

Compile the attached test case with -O2. Observe nearly all time spend in GVN
and more specifically, MemoryDependenceAnalysis and
getNonLocalPointerDepFromBB.
Originally test case is significantly larger and doesn't finish in any
reasonable time frame.

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