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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - r29 is used before being saved"
href="http://bugs.llvm.org/show_bug.cgi?id=32292">32292</a>
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<th>Summary</th>
<td>r29 is used before being saved
</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>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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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: PowerPC
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>timshen91@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=18104" name="attach_18104" title="Preprocessed adler32.c from zlib">attachment 18104</a> <a href="attachment.cgi?id=18104&action=edit" title="Preprocessed adler32.c from zlib">[details]</a></span>
Preprocessed adler32.c from zlib
When compiling adler32 in zlib, in the produced assembly:
~ % ~/sandbox/llvm/bin/clang -O2 -target powerpc64le-linux-gnu -S adler32.pre.c
-o - | grep '\b29\b'
li 29, 0
ori 5, 29, 65521
std 29, -24(1) # 8-byte Folded Spill
sub 29, 6, 0
rldicl 29, 29, 63, 1
add 0, 29, 0
ld 29, -24(1) # 8-byte Folded Reload
"li 29, 0" is not dominated by "std 29, -24(1)". r29 is callee-saved, and this
code clobbers r29's original value.</pre>
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