<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 - Non-canonical loop nest not diagnosed"
   href="https://bugs.llvm.org/show_bug.cgi?id=45233">45233</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Non-canonical loop nest not diagnosed
          </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>Windows NT
          </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>OpenMP
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>llvm@meinersbur.de
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Consider the following program:

int main() {
#pragma omp for collapse(2)
  for (int i = 0; i < 128; i += 1)
    for (int j = 0; j < 128; j += i)
      ;

  return 0;
}


According to the OpenMP specification, the incr must be:

<span class="quote">> An integer expression that is loop invariant with respect to the outermost</span >
associated loop

However, clang consumes this loop without error diagnostic.</pre>
        </div>
      </p>


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