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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ExprMutAnalyzer considers all NoOp-casts for Arguments as 'adding const' and not treating them as mutation"
href="https://bugs.llvm.org/show_bug.cgi?id=51756">51756</a>
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<th>Summary</th>
<td>ExprMutAnalyzer considers all NoOp-casts for Arguments as 'adding const' and not treating them as mutation
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
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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
</td>
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<th>Component</th>
<td>Tooling
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>development@jonas-toth.eu
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>During testing of <a href="https://reviews.llvm.org/D54943">https://reviews.llvm.org/D54943</a> a new false positive in the
'ExprMutAnalyzer' was spotted.
Reproducer: <a href="https://godbolt.org/z/8EvsM3Eqe">https://godbolt.org/z/8EvsM3Eqe</a>
Variables that are passed as arguments to a function are not considered to be
mutated, if there is an implicit cast, that is 'NoOp' (in the assumption that
this is a cast to 'const <ARGTYPE>').
Applying the '__unaligned' attribute introduces such a cast.
This results in the false analysis that this variable is not modified, where in
fact it is.
'ExprMutAnalyzer.cpp, Line 295'</pre>
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