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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - missed opportunities in reassociation or instcombine"
href="http://llvm.org/bugs/show_bug.cgi?id=22357">22357</a>
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<th>Summary</th>
<td>missed opportunities in reassociation or instcombine
</td>
</tr>
<tr>
<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>
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<th>Status</th>
<td>NEW
</td>
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<tr>
<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
</td>
</tr>
<tr>
<th>Reporter</th>
<td>wujingyue@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=13742" name="attach_13742" title="IR for the example">attachment 13742</a> <a href="attachment.cgi?id=13742&action=edit" title="IR for the example">[details]</a></span>
IR for the example
void foo(int a, int b, int c, int *x, int *y) {
*x = (a + b);
*y = (a + 2) + b;
}
I would love to see the above example be optimized to:
void foo(int a, int b, int c, int *x, int *y) {
int t = a + b;
*x = t;
int t2 = t + 2;
*y = t2;
}
However, this is not happening with the current LLVM.
I wonder how we can add this enhancement. It seems related to reassociation,
instcombine, and maybe even GVN?
Jingyue</pre>
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