<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 - lldb very slow single stepping rep stosb"
   href="https://bugs.llvm.org/show_bug.cgi?id=43091">43091</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>lldb very slow single stepping rep stosb
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>lldb
          </td>
        </tr>

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

        <tr>
          <th>Assignee</th>
          <td>lldb-dev@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>ntysdd@qq.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>jdevlieghere@apple.com, llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>When single stepping the asm instructions, I find lldb very slow when
encountering a (large) rep stosb.

The debugger essentially hung.

While I can use Ctrl-C to break the program into debugger, I still can't
continue debugging, because even I put a breakpoint on the next instruction,
and use the "c" command, it is still very slow.

However, if I don't try to single step the rep instruction, and directly put a
breakpoint on the next instruction and use "c", it's way faster.</pre>
        </div>
      </p>


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