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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ctpop/popcount missing folds"
href="https://bugs.llvm.org/show_bug.cgi?id=41337">41337</a>
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<th>Summary</th>
<td>ctpop/popcount missing folds
</td>
</tr>
<tr>
<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>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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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>david.bolvansky@gmail.com
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</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>unsigned popcount_bitrev(unsigned x) {
unsigned a = __builtin_bitreverse32(x);
return __builtin_popcount(a);
}
Since popcount returns number of set bits, we can simplify it to popcount(x).
Same for bswap, I think.</pre>
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