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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 - Failure to optimize strcpy to memcpy when result of strlen is available"
href="https://bugs.llvm.org/show_bug.cgi?id=47145">47145</a>
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<th>Summary</th>
<td>Failure to optimize strcpy to memcpy when result of strlen is available
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</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>
</tr></table>
<p>
<div>
<pre>char *f(char *p, char *r)
{
char buf[10000];
if (strlen(p) > 10000)
return NULL;
strcpy(buf, p);
return strdup(buf);
}
The strcpy here could be optimized to `memcpy` using the result of `strlen(p)`
that has already been computed. This transformation is done by GCC, but not by
LLVM.</pre>
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