<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 - Failure to optimize followed xors into seperate xors to avoid mov"
   href="https://bugs.llvm.org/show_bug.cgi?id=45774">45774</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Failure to optimize followed xors into seperate xors to avoid mov
          </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>Linux
          </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>Scalar Optimizations
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>gabravier@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>int f(int x, int y, int c)
{
    return (x - y - c) ^ x ^ y;
}

With -O3, GCC outputs this :

f:
  mov eax, edi
  xor edi, esi
  sub eax, esi
  sub eax, edx
  xor eax, edi
  ret

Clang outputs this :

f:
  mov eax, esi
  mov ecx, edi
  sub ecx, esi
  sub ecx, edx
  xor eax, edi
  xor eax, ecx
  ret</pre>
        </div>
      </p>


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      <ul>
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