<html>
    <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 - Fix ldrexd/strexd miscompilation in the ARM backend on Cortex-M"
   href="https://bugs.llvm.org/show_bug.cgi?id=49047">49047</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Fix ldrexd/strexd miscompilation in the ARM backend on Cortex-M
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>11.0
          </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>enhancement
          </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>aykevanlaethem@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Blocks</th>
          <td>48902
          </td>
        </tr></table>
      <p>
        <div>
        <pre>I discovered an issue in the ARM backend: it was emitting ldrexd/strexd
instructions even for Cortex-M microcontrollers which don't have these
instructions.

This is fixed in
<a href="https://reviews.llvm.org/rGaecdf15cc7f866180dc769265b8183cad34bb33a">https://reviews.llvm.org/rGaecdf15cc7f866180dc769265b8183cad34bb33a</a>. It would
be great to have this fix in LLVM 12 too (I discovered this issue only a few
days after the branch).</pre>
        </div>
      </p>

        <div id="referenced">
          <hr style="border: 1px dashed #969696">
          <b>Referenced Bugs:</b>
          <ul>
              <li>
                [<a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [meta] 12.0.0 Release Blockers"
   href="https://bugs.llvm.org/show_bug.cgi?id=48902">Bug 48902</a>] [meta] 12.0.0 Release Blockers
              </li>
          </ul>
        </div>
        <br>

      <hr>
      <span>You are receiving this mail because:</span>

      <ul>
          <li>You are on the CC list for the bug.</li>
      </ul>
    </body>
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