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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Miscompilation in Botan's SHA3 with optimization -O2 and -O3"
href="https://bugs.llvm.org/show_bug.cgi?id=51957">51957</a>
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<th>Summary</th>
<td>Miscompilation in Botan's SHA3 with optimization -O2 and -O3
</td>
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>12.0
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<th>Hardware</th>
<td>Macintosh
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<th>OS</th>
<td>MacOS X
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>llvm-bugzilla@renemeusel.de
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Clang 12 and Apple Clang 13 seem to cause a miscompilation for optimization
levels -O2 and -O3 in the C++ SHA3 implementation of the Botan library.
GitHub issue with detailed investigation steps and a minimal reproducer that
doesn't depend on Botan:
<a href="https://github.com/randombit/botan/issues/2802#issuecomment-926055635">https://github.com/randombit/botan/issues/2802#issuecomment-926055635</a>
GitHub pull request with a workaround:
<a href="https://github.com/randombit/botan/pull/2803">https://github.com/randombit/botan/pull/2803</a>
In the reproducing program, wrong results seem to surface in line 3 of
SHA3_round():
const uint64_t C2 = A[2] ^ A[7] ^ A[12] ^ A[17] ^ A[22];
for the given input values, the result in C2 would be too large to fit into a
64-bit signed integer. FWIW.</pre>
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