<html>
    <head>
      <base href="https://llvm.org/bugs/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [guards] GVN/NewGVN should propagate guard conditions"
   href="https://llvm.org/bugs/show_bug.cgi?id=31523">31523</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[guards] GVN/NewGVN should propagate guard conditions
          </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>listmail@philipreames.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>GVN currently does not have any handling for the llvm.experimental.guard
intrinsics.  It does support assumes.  We should extend the handling to
propagate equalities from guards as well.

As a trivial example:
guard (a != null);
...
guard (a != null); // can be removed

Note that we also need to add the same handling to the new memory SSA based
NewGVN.</pre>
        </div>
      </p>
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