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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Loop miscompile"
href="https://bugs.llvm.org/show_bug.cgi?id=37823">37823</a>
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<th>Summary</th>
<td>Loop miscompile
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>6.0
</td>
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<th>Hardware</th>
<td>Macintosh
</td>
</tr>
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<th>OS</th>
<td>MacOS X
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>ks@claylabs.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=20434" name="attach_20434" title="Program to trigger bug in Clang">attachment 20434</a> <a href="attachment.cgi?id=20434&action=edit" title="Program to trigger bug in Clang">[details]</a></span>
Program to trigger bug in Clang
I've attached a relatively simple program that triggers a miscompile. The
program logic should be straight-forward. I'm fairly certain there is no
undefined behavior.
When compiling with -O2 or -O3, the wrong output is produced. The generated
program also triggers an error with valgrind.
When compiling the attached program with -O0, the correct output is produced,
and there are no errors with valgrind.
I've tested with LLVM 6.0 and also with Xcode 9.4.1. The OS is High Sierra.</pre>
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