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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - memset not generated for ** array zero-initialization"
href="https://bugs.llvm.org/show_bug.cgi?id=52143">52143</a>
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<th>Summary</th>
<td>memset not generated for ** array zero-initialization
</td>
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<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>
<tr>
<th>Keywords</th>
<td>beginner
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Loop Optimizer
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>pavel.iliin@arm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>clang at -O2 missed opportunity to generate memset for
unsigned** a;
void foo( int max )
{
for (int i = 0; i <= max; ++i)
{
a[i] = 0;
}
}
and left the loop, while gcc succeeded to do this:
X86-64 <a href="https://godbolt.org/z/oK59vf66n">https://godbolt.org/z/oK59vf66n</a>
AArch64 <a href="https://godbolt.org/z/G53W1vz7W">https://godbolt.org/z/G53W1vz7W</a></pre>
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</p>
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