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    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <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>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[CFGSimplification] Generate none optimized constant ADD operations
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>new-bugs
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>new bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>Hao.Liu@arm.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <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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