[llvm-bugs] [Bug 39124] New: ppc64el assertion failure in llvm::AsmPrinter::EmitJumpTableEntry

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39124

            Bug ID: 39124
           Summary: ppc64el assertion failure in
                    llvm::AsmPrinter::EmitJumpTableEntry
           Product: libraries
           Version: 7.0
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: PHHargrove at lbl.gov
                CC: llvm-bugs at lists.llvm.org

Created attachment 20938
  --> https://bugs.llvm.org/attachment.cgi?id=20938&action=edit
Compilation output including backtrace

The following assertion failure has been seen with llvm-7.0.0:

clang-7:
/home/phargrov/llvm-7.0.0.src/lib/CodeGen/AsmPrinter/AsmPrinter.cpp:1759: void
llvm::AsmPrinter::EmitJumpTableEntry(const llvm::MachineJumpTableInfo*, const
llvm::MachineBasicBlock*, unsigned int) const: Assertion `MBB &&
MBB->getNumber() >= 0 && "Invalid basic block"' failed.

However, 4.0, 5.0 and 6.0 show the same, while 3.7 and 3.8 do not.

The same code does not generate any such failure on (at least) x86, x86-64,
arm, aarch64, sparc64 (for various 4.0, 5.0 or 6.0 versions).

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