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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Failure to optimize out indirect access to unused variable"
href="https://bugs.llvm.org/show_bug.cgi?id=49001">49001</a>
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<th>Summary</th>
<td>Failure to optimize out indirect access to unused variable
</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>
</tr>
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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>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>gabravier@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>void f(bool x)
{
int a, b;
*(x ? &a : &b) = 0;
}
This can be optimized to doing nothing. This transformation is done by GCC, but
not by LLVM.
Godbolt comparison here: <a href="https://godbolt.org/z/8Grfjd">https://godbolt.org/z/8Grfjd</a>
(I think an alive2 link would be useless here, considering it's not really
applicable to this kind of stuff)</pre>
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</p>
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