<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 --- - ud2 instruction is generated with LTO"
   href="https://llvm.org/bugs/show_bug.cgi?id=24596">24596</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>ud2 instruction is generated with LTO
          </td>
        </tr>

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

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

        <tr>
          <th>Reporter</th>
          <td>santosh.zanjurne@amd.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=14784" name="attach_14784" title="llvm ir">attachment 14784</a> <a href="attachment.cgi?id=14784&action=edit" title="llvm ir">[details]</a></span>
llvm ir

clang generates ud2 when attached IR is compiled with LTO.


$ clang -flto  test.ll -shared -o t.so -fpic -m64
$ objdump -D  t.so | grep ud2
 855:   0f 0b                   ud2
$

The issue is not seen without LTO.</pre>
        </div>
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