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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 - Add UB sanitizer for __builtin_assume a la -fsanitize=unreachable"
   href="https://bugs.llvm.org/show_bug.cgi?id=32162">32162</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Add UB sanitizer for __builtin_assume a la -fsanitize=unreachable
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

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

        <tr>
          <th>OS</th>
          <td>All
          </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>jacobsa@google.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>-fsanitize=unreachable allows discovering programmer mistakes in constructs
like the following:

    if (!expr) {
      __builtin_unreachable();
    }

As far as I'm aware, it *doesn't* cover the following construct, which is
functionally equivalent but which I'm told may perform better in optimized
builds:

    __builtin_assume(expr);

Should there be a sanitizer that covers this?</pre>
        </div>
      </p>


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