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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Make std::fill_n use memset_pattern*() for pod types of the right size"
href="https://llvm.org/bugs/show_bug.cgi?id=27206">27206</a>
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<th>Summary</th>
<td>Make std::fill_n use memset_pattern*() for pod types of the right size
</td>
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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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>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>ahatanak@gmail.com
</td>
</tr>
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<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>libc++ should use memset_pattern when the input is right (== 4/8/16, type is
pod, target iterator is a pointer) instead of using a loop.
For example, clang/llvm currently emits a loop for fill_n in the following
example:
$ cat test.cpp
struct S {
int i;
};
S v[256];
void foo(const S &s) {
fill_n(v,256,s); // use memset_pattern4(v,&s,256*4) here
}</pre>
</div>
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