[llvm-bugs] [Bug 27486] New: [InductiveRangeCheckElimination] invalidates domtree and hits asserts w/ XDEBUG

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27486

            Bug ID: 27486
           Summary: [InductiveRangeCheckElimination] invalidates domtree
                    and hits asserts w/ XDEBUG
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: gberry at codeaurora.org
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

The following lit tests hit asserts in verifyDomTree when LLVM is compiled w/
XDEBUG:

    LLVM :: Transforms/IRCE/decrementing-loop.ll
    LLVM :: Transforms/IRCE/multiple-access-no-preloop.ll
    LLVM :: Transforms/IRCE/only-upper-check.ll
    LLVM :: Transforms/IRCE/single-access-no-preloop.ll
    LLVM :: Transforms/IRCE/single-access-with-preloop.ll
    LLVM :: Transforms/IRCE/with-parent-loops.ll

Sample output:

DominatorTree is not up to date!
Computed:
=============================--------------------------------
Inorder Dominator Tree: DFSNumbers invalid: 7 slow queries.
  [1] %entry {0,9}
    [2] %exit {7,8}
    [2] %loop.preheader {4294967295,4294967295}
      [3] %loop {1,6}
        [4] %in.bounds {2,3}
          [5] %exit.loopexit {4294967295,4294967295}
        [4] %out.of.bounds {4,5}

Actual:
=============================--------------------------------
Inorder Dominator Tree: 
  [1] %entry {0,23}
    [2] %loop.preheader {1,20}
      [3] %loop.preloop {2,7}
        [4] %in.bounds.preloop {3,6}
          [5] %preloop.exit.selector {4,5}
      [3] %preloop.pseudo.exit {8,15}
        [4] %mainloop {9,14}
          [5] %loop {10,13}
            [6] %in.bounds {11,12}
      [3] %exit.loopexit {16,17}
      [3] %out.of.bounds {18,19}
    [2] %exit {21,22}
#0 0x00000000017f7158 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/local/mnt/gberry/test/build-xdbg/llvm/bin/opt+0x17f7158)
#1 0x00000000017f5946 llvm::sys::RunSignalHandlers()
(/local/mnt/gberry/test/build-xdbg/llvm/bin/opt+0x17f5946)
#2 0x00000000017f7c86 SignalHandler(int)
(/local/mnt/gberry/test/build-xdbg/llvm/bin/opt+0x17f7c86)
#3 0x00007fe1e4d44cb0 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0xfcb0)
#4 0x00007fe1e3f090d5 gsignal
/build/eglibc-rrybNj/eglibc-2.15/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:64:0
#5 0x00007fe1e3f0c83b abort
/build/eglibc-rrybNj/eglibc-2.15/stdlib/abort.c:93:0
#6 0x00000000013dd53a llvm::DominatorTree::verifyDomTree() const
(/local/mnt/gberry/test/build-xdbg/llvm/bin/opt+0x13dd53a)
#7 0x0000000001414f69 llvm::PMDataManager::verifyPreservedAnalysis(llvm::Pass*)
(/local/mnt/gberry/test/build-xdbg/llvm/bin/opt+0x1414f69)
#8 0x0000000001048ce7 llvm::LPPassManager::runOnFunction(llvm::Function&)
(/local/mnt/gberry/test/build-xdbg/llvm/bin/opt+0x1048ce7)
#9 0x0000000001418698 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/local/mnt/gberry/test/build-xdbg/llvm/bin/opt+0x1418698)
#10 0x00000000014188db llvm::FPPassManager::runOnModule(llvm::Module&)
(/local/mnt/gberry/test/build-xdbg/llvm/bin/opt+0x14188db)
#11 0x0000000001418d98 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/local/mnt/gberry/test/build-xdbg/llvm/bin/opt+0x1418d98)
#12 0x000000000063b74e main
(/local/mnt/gberry/test/build-xdbg/llvm/bin/opt+0x63b74e)
#13 0x00007fe1e3ef476d __libc_start_main
/build/eglibc-rrybNj/eglibc-2.15/csu/libc-start.c:258:0
#14 0x0000000000626cad _start
(/local/mnt/gberry/test/build-xdbg/llvm/bin/opt+0x626cad)
Stack dump:
0.    Program arguments: /local/mnt/gberry/test/build-xdbg/llvm/./bin/opt -irce
-S 
1.    Running pass 'Function Pass Manager' on module '<stdin>'.
2.    Running pass 'Loop Pass Manager' on function '@decrementing_loop'

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