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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [CFGSimplification] Generate none optimized constant ADD operations"
href="http://llvm.org/bugs/show_bug.cgi?id=21473">21473</a>
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<th>Summary</th>
<td>[CFGSimplification] Generate none optimized constant ADD operations
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<th>Product</th>
<td>new-bugs
</td>
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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>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>Hao.Liu@arm.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
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</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=13285" name="attach_13285" title="CFGSimplification Test Case">attachment 13285</a> <a href="attachment.cgi?id=13285&action=edit" title="CFGSimplification Test Case">[details]</a></span>
CFGSimplification Test Case
To reproduce by following command lines:
clang -O3 -S -emit-llvm simple.c
llc -march=aarch64 < simple.ll -print-after-all
We can see that in AArch64 backend, CFGSimplification generate none optimized
ADDs as follows:
...
%inc.1.1 = add nsw i32 2, 1
...
%inc.2.1 = add nsw i32 %inc.1.1, 1
...
%inc.1.2 = add nsw i32 %inc.1.1, 2
...
Such ADDs can be replaced by constants 3, 4, 5.</pre>
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