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    <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 --- - Semantics of negative zero in fmin and fmax"
   href="http://llvm.org/bugs/show_bug.cgi?id=16728">16728</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Semantics of negative zero in fmin and fmax
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>3.3
          </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>-New Bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>ambrop7@gmail.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>Clang's implementation of fmin/fmax (and possibly other functions) treats
negative zero incompatibly with gcc, and inconsistent with regard to the order
of the arguments. Test case:

#include <math.h>
#include <stdio.h>
int main ()
{
    printf("%f %f %f %f\n", fmin(-0.0, 0.0), fmin(0.0, -0.0), fmax(-0.0, 0.0),
fmax(0.0, -0.0));
}

In gcc, the result is, as one might expect:
-0.000000 -0.000000 0.000000 0.000000

But in clang, it is:
0.000000 -0.000000 0.000000 -0.000000

Also note how fmin(-0.0, 0.0) is different from fmin(0.0, -0.0), same goes for
fmax.</pre>
        </div>
      </p>
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