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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Reassociate: nsw/nuw dropped when merging add into mul"
href="http://llvm.org/bugs/show_bug.cgi?id=21611">21611</a>
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<th>Summary</th>
<td>Reassociate: nsw/nuw dropped when merging add into mul
</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>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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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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</tr>
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<th>Reporter</th>
<td>david.majnemer@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>consider:
define i32 @triple_i(i32 %x) {
%1 = add nsw i32 %x, %x
%2 = add nsw i32 %1, %x
ret i32 %2
}
after running with opt -reassociate:
define i32 @triple_i(i32 %x) {
%factor = mul i32 %x, 3
ret i32 %factor
}</pre>
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