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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Benchmark regression vs GCC: mcf"
href="https://bugs.llvm.org/show_bug.cgi?id=39196">39196</a>
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<th>Summary</th>
<td>Benchmark regression vs GCC: mcf
</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>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>paulsson@linux.vnet.ibm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>It seems that GCC manages to hoist a store inside a loop to a single store
after the loop, while clang stores in every iteration.
This seems to relate to concurrency and to the ability of the compiler to prove
that the value is stored at least once. For discussion and a reduced test case,
see: <a href="http://lists.llvm.org/pipermail/llvm-dev/2018-September/126281.html">http://lists.llvm.org/pipermail/llvm-dev/2018-September/126281.html</a>
The function is in pbeampp.c</pre>
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