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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - std::copy to memmove optimisation seems to not work."
href="https://bugs.llvm.org/show_bug.cgi?id=40575">40575</a>
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<th>Summary</th>
<td>std::copy to memmove optimisation seems to not work.
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<th>Product</th>
<td>libc++
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<th>Version</th>
<td>unspecified
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>denis.yaroshevskij@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<pre>std::copy has an optimization to memmove but it doesn't seem to work:
<a href="https://gcc.godbolt.org/z/a6lvSm">https://gcc.godbolt.org/z/a6lvSm</a> (no memmove)
I has real consequences:
libstdc++: <a href="http://quick-bench.com/vpLxYCWfverSzlWxFjwuXxELD8Q">http://quick-bench.com/vpLxYCWfverSzlWxFjwuXxELD8Q</a>
libc++: <a href="http://quick-bench.com/kfsPjkSo79hHiy0ZVrMCn7wU6Xw">http://quick-bench.com/kfsPjkSo79hHiy0ZVrMCn7wU6Xw</a></pre>
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