<html>
    <head>
      <base href="https://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 --- - -O3 on AMD Phenom causes long compilation time"
   href="https://llvm.org/bugs/show_bug.cgi?id=25981">25981</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>-O3 on AMD Phenom causes long compilation time
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>new-bugs
          </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>new bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>dcb314@hotmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=15538" name="attach_15538" title="C source code">attachment 15538</a> <a href="attachment.cgi?id=15538&action=edit" title="C source code">[details]</a></span>
C source code

The attached file, when compiled with clang trunk revision 256486,
fails to compile in 20 minutes CPU time on a 3.5GHz AMD Phenom.

-O2 takes 2.4 seconds.

clang version 3.8 with -O3 takes 1.8 seconds.</pre>
        </div>
      </p>
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