[llvm-bugs] [Bug 40676] New: hang in llvm::SelectionDAG::computeKnownBits

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40676

            Bug ID: 40676
           Summary: hang in llvm::SelectionDAG::computeKnownBits
           Product: libraries
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: andrew at ziglang.org
                CC: llvm-bugs at lists.llvm.org

Created attachment 21459
  --> https://bugs.llvm.org/attachment.cgi?id=21459&action=edit
test.ll

This 27-line LLVM IR file causes a hang in LLVM 7.0.1 and LLVM 8.0.0rc2. It
would take me several hours and more hard drive space than I have to confirm
that it also causes a hang in trunk, but I strongly suspect that it remains an
active bug.

Repro: clang -c test.ll

Downstream issue report: https://github.com/ziglang/zig/issues/1932

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