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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 merge loops with identi"
href="https://bugs.llvm.org/show_bug.cgi?id=45718">45718</a>
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<th>Summary</th>
<td>Failure to merge loops with identi
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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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>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Loop Optimizer
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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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>
</tr></table>
<p>
<div>
<pre>void f(int *__restrict a, int *__restrict b, size_t sz)
{
for (int i = 0; i < sz; ++i)
a[i] += b[i];
for (int i = 0; i < sz; ++i)
a[i] += b[i];
}
These two loops could be merged into a single one doing two additions per
iteration. ICC does this transformation, LLVM does not.
See also <a href="https://godbolt.org/z/YnCPNA">https://godbolt.org/z/YnCPNA</a></pre>
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