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    <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 - Sanitizer + -O3 stalls in LLVM backend"
   href="https://bugs.llvm.org/show_bug.cgi?id=42889">42889</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Sanitizer + -O3 stalls in LLVM backend
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>8.0
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

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

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

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

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

        <tr>
          <th>Component</th>
          <td>LLVM Codegen
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>dominik.strasser@onespin.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=22339" name="attach_22339" title="Source code stalling the compiler">attachment 22339</a> <a href="attachment.cgi?id=22339&action=edit" title="Source code stalling the compiler">[details]</a></span>
Source code stalling the compiler

compiling the attached source (admittedly large, it is a bison output) runs for
hours in the backend.

Looking at the clang backtrace suggests that
llvm::RegAllocBase::allocatePhysRegs
could be the problematic code area.</pre>
        </div>
      </p>


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