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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - std::copy() calls memmove on nontrivially-copyable type"
href="https://llvm.org/bugs/show_bug.cgi?id=28527">28527</a>
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<th>Summary</th>
<td>std::copy() calls memmove on nontrivially-copyable type
</td>
</tr>
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<th>Product</th>
<td>libc++
</td>
</tr>
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<th>Version</th>
<td>3.8
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>All Bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>aaron@aaronballman.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Consider the following snippet:
#include <algorithm>
int main() {
volatile int *v1[100];
volatile int *v2[100];
std::copy(v1, v1 + 100, v2);
}
This results in a call to memmove() rather than copying individual volatile
elements of the array (<a href="https://godbolt.org/g/b0fv3R">https://godbolt.org/g/b0fv3R</a>). This should be handled a
bit more kindly, since volatile-qualified types are not trivially-copyable
types ([basic.types]p9 states in part: "Cv-unqualified scalar types, trivially
copyable class types (Clause 9), arrays of such types, and nonvolatile
const-qualified versions of these types (3.9.3) are collectively called
trivially copyable types.").</pre>
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</p>
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