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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - layer2/RepCylBond.cpp exposes compiler ICE for -O1 or higher without -fno-strict-aliasing"
href="https://bugs.llvm.org/show_bug.cgi?id=37280">37280</a>
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<th>Summary</th>
<td>layer2/RepCylBond.cpp exposes compiler ICE for -O1 or higher without -fno-strict-aliasing
</td>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>6.0
</td>
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<th>Hardware</th>
<td>Macintosh
</td>
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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>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>howarth.mailing.lists@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>The recent code for layer2/RepCylBond.cpp has exposed a clang compiler ICE on
Darwin.
7 warnings generated.
fatal error: error in backend: Unsupported expression in static initializer:
fsub (float 1.000000e+00, float undef)
clang: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 6.0.0 (tags/RELEASE_600/final)
Target: x86_64-apple-darwin17.5.0
Thread model: posix
InstalledDir: /opt/local/libexec/llvm-6.0/bin
This issue occurs reportedly is present with Xoode's clang circa OS X 10.9 and
is confirmed in llvm.org's clang since at least clang 4.0 up to clang 6.0. The
issue doesn't occur for the -O0 or no optimization flags but does occur for -O1
or higher. The compiler ICE is suppressed however if -fno-strict-aliasing is
passed to the compiler.</pre>
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</p>
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