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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Loop to clear bits is not eliminated"
href="https://bugs.llvm.org/show_bug.cgi?id=37292">37292</a>
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<th>Summary</th>
<td>Loop to clear bits is not eliminated
</td>
</tr>
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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>
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<th>Status</th>
<td>NEW
</td>
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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>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>david.bolvansky@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Hello,
Loop in the function "test" can be eliminated.
unsigned test() {
unsigned a = 2;
unsigned bits = 1;
while (a != 0) {
a &= ~bits;
bits <<= 1;
}
return 0;
}
Also godbolt:
<a href="https://godbolt.org/g/DHoZdn">https://godbolt.org/g/DHoZdn</a> (intel icc can optimize this away)
Thanks</pre>
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