<html>
    <head>
      <base href="http://llvm.org/bugs/" />
    </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 --- - Infinite loop in AlwaysInliner pass"
   href="http://llvm.org/bugs/show_bug.cgi?id=18955">18955</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Infinite loop in AlwaysInliner pass
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>trunk
          </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>normal
          </td>
        </tr>

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

        <tr>
          <th>Component</th>
          <td>Interprocedural Optimizations
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>anthony.louis.eden@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Attached is a tarball of two LLVM code modules which are nearly identical. When
running

opt -O2 -o bad.bc bad.ll

opt rapidly consumes GiB's of memory and seems to run indefinitely (>10min).
When running

opt -O2 -o good.bc good.ll

opt exits quickly. The difference between the two modules is 599 removals of
the alwaysinline function attribute; therefore I believe the problem is in the
AlwaysInliner pass. I also wrote code to only run the AlwaysInliner pass, and
that produced the same result.

I have also experimentally observed this bug in the LLVM 3.4 and LLVM 3.0
releases.</pre>
        </div>
      </p>
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