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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Failure to optimize out dead part of store when followed by smaller overlapping store"
href="https://bugs.llvm.org/show_bug.cgi?id=52087">52087</a>
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<th>Summary</th>
<td>Failure to optimize out dead part of store when followed by smaller overlapping store
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>gabravier@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>void foo(char *__restrict a, char *__restrict b, char *__restrict c)
{
memcpy(a, b, 128);
memcpy(a, c, 64);
}
This can be optimized to this:
void foo2(char *__restrict a, char *__restrict b, char *__restrict c)
{
memcpy(a + 64, b + 64, 64);
memcpy(a, c, 64);
}
This optimization is done by GCC, but not by LLVM.</pre>
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