[LLVMbugs] [Bug 20642] New: [SLP] Assertion `(ScalarToTreeEntry.count(U) || (std::find(UserIgnoreList.begin(), UserIgnoreList.end(), U) != UserIgnoreList.end())) && "Replacing out-of-tree value with undef"' failed

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20642

            Bug ID: 20642
           Summary: [SLP] Assertion `(ScalarToTreeEntry.count(U) ||
                    (std::find(UserIgnoreList.begin(),
                    UserIgnoreList.end(), U) != UserIgnoreList.end())) &&
                    "Replacing out-of-tree value with undef"' failed
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Loop Optimizer
          Assignee: unassignedbugs at nondot.org
          Reporter: joerg at NetBSD.org
                CC: isanbard at gmail.com, llvmbugs at cs.uiuc.edu,
                    richard-llvm at metafoo.co.uk
    Classification: Unclassified

Created attachment 12889
  --> http://llvm.org/bugs/attachment.cgi?id=12889&action=edit
Test case

Build the attached test case with -O2 for amd64.

This is a regression compared to clang 3.4 and the code is simple enough that
it is likely to hit in the wild.

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