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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Lowering of atomic ops doesn't reuse registers"
href="http://llvm.org/bugs/show_bug.cgi?id=18890">18890</a>
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<th>Summary</th>
<td>Lowering of atomic ops doesn't reuse registers
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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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>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: X86
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>joerg@NetBSD.org
</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=12084" name="attach_12084" title="Test case">attachment 12084</a> <a href="attachment.cgi?id=12084&action=edit" title="Test case">[details]</a></span>
Test case
Compile the attached test program with -O2 for amd64. Observe that the assembly
is not using known zero value of %rax for the xchg, but creating a new register
for that purpose.
Problem applies to other __sync_* builtins as well.</pre>
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