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

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List:       llvm-bugs
Subject:    [llvm-bugs] [Bug 39124] New: ppc64el assertion failure in llvm::AsmPrinter::EmitJumpTableEntry
From:       via llvm-bugs <llvm-bugs () lists ! llvm ! org>
Date:       2018-09-28 22:54:48
Message-ID: bug-39124-206 () http ! bugs ! llvm ! org/
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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@nondot.org
          Reporter: PHHargrove@lbl.gov
                CC: llvm-bugs@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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Date: Fri, 28 Sep 2018 15:54:48 -0700
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<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - ppc64el assertion failure in llvm::AsmPrinter::EmitJumpTableEntry"
   href="https://bugs.llvm.org/show_bug.cgi?id=39124">39124</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>ppc64el assertion failure in llvm::AsmPrinter::EmitJumpTableEntry
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>libraries
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>7.0
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Common Code Generator Code
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedbugs&#64;nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>PHHargrove&#64;lbl.gov
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs&#64;lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=20938" \
name="attach_20938" title="Compilation output including backtrace">attachment \
20938</a> <a href="attachment.cgi?id=20938&amp;action=edit" title="Compilation output \
including backtrace">[details]</a></span> 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 &amp;&amp;
MBB-&gt;getNumber() &gt;= 0 &amp;&amp; &quot;Invalid basic block&quot;' 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).</pre>
        </div>
      </p>

      <hr>
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