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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missing memmove detection with non constant size"
href="https://bugs.llvm.org/show_bug.cgi?id=51755">51755</a>
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<th>Summary</th>
<td>Missing memmove detection with non constant size
</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>
<tr>
<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>david.bolvansky@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>void missing_memmove_unsigned (unsigned N, char *a)
{
unsigned j = N;
while (j > 0) {
a[j] = a[j - 1];
--j;
}
}
void missing_memmove_signed(int N, char *a)
{
int j;
for (j = N; j > 0; j--)
a[j] = a[j - 1];
}
GCC can emit memmove missing_memmove_signed.
<a href="https://godbolt.org/z/noTn15Ejc">https://godbolt.org/z/noTn15Ejc</a></pre>
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</p>
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