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      <base href="http://llvm.org/bugs/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - unnecessary push/pop in small function"
   href="http://llvm.org/bugs/show_bug.cgi?id=16882">16882</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>unnecessary push/pop in small function
          </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>Backend: ARM
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>jay.foad@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>Created <span class=""><a href="attachment.cgi?id=11034" name="attach_11034" title="C source for testcase">attachment 11034</a> <a href="attachment.cgi?id=11034&action=edit" title="C source for testcase">[details]</a></span>
C source for testcase

On the attached test case I get:

$ clang -target armv6 -O2 -fomit-frame-pointer -S mul.c -o -
...
mul:
    push    {lr}
    smull    r0, r1, r1, r0
    teq    r1, r0, asr #31
    popeq    {lr}
    bxeq    lr
    bl    overflow

The push and popeq instructions are completely unnecessary.

I'm using LLVM and Clang built from svn r188366.</pre>
        </div>
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