<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 --- - SLSR pass takes too long on simple programs"
   href="https://llvm.org/bugs/show_bug.cgi?id=28721">28721</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>SLSR pass takes too long on simple programs
          </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>Scalar Optimizations
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>tstellar@gmail.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=16810" name="attach_16810" title="Reduced test case">attachment 16810</a> <a href="attachment.cgi?id=16810&action=edit" title="Reduced test case">[details]</a></span>
Reduced test case

Attached is an reduced test case which takes about ~9 seconds for the
straight-line scalar reduction (SLSR) pass on my very fast CPU.  I think this
is too long given that the test case only has around 60 instructions.

To reproduce:

opt -slsr -mtriple=amdgcn--amdhsa -mcpu=fiji slsr-reduced.ll</pre>
        </div>
      </p>
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