<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 dead code in a loop"
   href="http://llvm.org/bugs/show_bug.cgi?id=18490">18490</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Detect  dead code in a loop
          </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>All
          </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>Frontend
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>daniel@zuster.org
          </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>Clang should detect and warn about the dead code in the following loop, either
from regular flow analysis warnings (if we can do it cheap enough), but if not
that then from the static analyzer:
--
$ cat t.c
void f0(int);
void f1() {
  int first = 1;
  for (int i = 0; i < 5; ++i) {
    if (first) continue;
    f0(i);
    first = 0;
  }
}
$ clang -c -Weverything --analyze t.c

--</pre>
        </div>
      </p>
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