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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - PowerPC code gen bug in 3.8. invalid elimination of store"
href="https://llvm.org/bugs/show_bug.cgi?id=27138">27138</a>
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<th>Summary</th>
<td>PowerPC code gen bug in 3.8. invalid elimination of store
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>3.8
</td>
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<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
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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>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>eric.schweitz@pgroup.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</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=16132" name="attach_16132" title="code that exposes a store elimination bug">attachment 16132</a> <a href="attachment.cgi?id=16132&action=edit" title="code that exposes a store elimination bug">[details]</a></span>
code that exposes a store elimination bug
The bugged .ll example shows a floating-point value of 4.0 being stored,
loaded, and multiplied by 0.2. The value 0.8 is then printed as output by LLVM
3.7. In LLVM 3.8, the output is 0.0. It appears that the store of 4.0 is
erroneously eliminated.
To expose the bug the following commands were used:
llc -O0 -o bug.s bug.ll
as bug.s -o bug.o
clang bug.o -O0 -o bug.out
./bug.out
0.000000</pre>
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