<html>
    <head>
      <base href="http://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 --- - Detect unnecessary postfix ++ or --"
   href="http://llvm.org/bugs/show_bug.cgi?id=21908">21908</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Detect unnecessary postfix ++ or --
          </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>Windows NT
          </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>Static Analyzer
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>kremenek@apple.com
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>legalize@xmission.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>In code like this:

 1:    i = 32767 + read_help_topic(INTRO_AUTHORS, 0, 32767, screen_text);
 2:    screen_text[i++] = '\0';
 3:    i = 32767 + read_help_topic(INTRO_CREDITS, 0, 32767, credits);
 4:    credits[i++] = '\0';
 5:
 6:    j = 0;
 7:    authors.push_back(0);               /* find the start of each
credit-line */
 8:    for (i = 0; credits[i] != 0; i++)
 9:        if (credits[i] == 10)
10:            authors.push_back(i+1);
11:    authors.push_back(i);

The postfix ++ applied on lines 2 and 4 result in a modification to i that is
never read, but deadcode.DeadStores doesn't report this.

See attached source, lines 40-43 in intro.cpp</pre>
        </div>
      </p>
      <hr>
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