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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 - __builtin_popcount(~a) & 1 - > __builtin_popcount(a) & 1"
href="https://bugs.llvm.org/show_bug.cgi?id=50096">50096</a>
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<th>Summary</th>
<td>__builtin_popcount(~a) & 1 - > __builtin_popcount(a) & 1
</td>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<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>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<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>
<tr>
<th>Reporter</th>
<td>david.bolvansky@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>----------------------------------------
define i32 @src(i32 %0) noread nowrite nofree {
%1:
%2 = xor i32 %0, 4294967295
%3 = ctpop i32 %2
%4 = and i32 %3, 1
ret i32 %4
}
=>
define i32 @tgt(i32 %0) noread nowrite nofree {
%1:
%2 = ctpop i32 %0
%3 = and i32 %2, 1
ret i32 %3
}
Transformation seems to be correct!
<a href="https://godbolt.org/z/hGoxxYYd6">https://godbolt.org/z/hGoxxYYd6</a></pre>
</div>
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