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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Failure to detect abs pattern using multiplication"
href="https://bugs.llvm.org/show_bug.cgi?id=45691">45691</a>
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<th>Summary</th>
<td>Failure to detect abs pattern using multiplication
</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>
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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>Scalar Optimizations
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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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>unsigned r(int v)
{
return (1 | -(v < 0)) * v;
}
`r` is equivalent to `abs(v)`. LLVM does not make the transformation to an
`abs`.
Example of the optimization not being done : <a href="https://godbolt.org/z/9Lwxoc">https://godbolt.org/z/9Lwxoc</a></pre>
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