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<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>
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<th>Summary</th>
<td>unnecessary push/pop in small function
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: ARM
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>jay.foad@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<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>
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