<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 --- - Poor code generated for double conditional"
   href="http://llvm.org/bugs/show_bug.cgi?id=15946">15946</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Poor code generated for double conditional
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>libraries
          </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>Backend: X86
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>jmuizelaar@mozilla.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>gcc gives:
        xor    %eax,%eax
        ucomisd %xmm0,%xmm1
        seta   %al
        retq

clang gives:
    ucomisd    %xmm0,%xmm1
    seta    %al
    movzbl    %al,%eax
    ret

<a href="https://bugzilla.mozilla.org/show_bug.cgi?id=869525#c6">https://bugzilla.mozilla.org/show_bug.cgi?id=869525#c6</a> gives some more
justification for this optimization.</pre>
        </div>
      </p>
      <hr>
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