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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - [AArch64] 403050abcc091260be2e8f58484e7a39c0782b47 increased Spill/Reload/ by 5 times" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D24171&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=-72aCF-i-W5CS7H3RX5n1zTTcCMpfN8PSBfoS02BtS8&s=d59_xaYWIk7b8rd3CwuAxsZhB86B3v43l7BKDTK9wGA&e=">24171</a>
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<th>Summary</th>
<td>[AArch64] 403050abcc091260be2e8f58484e7a39c0782b47 increased Spill/Reload/ by 5 times
</td>
</tr>
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<th>Product</th>
<td>tools
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>opt
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
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<th>Reporter</th>
<td>lawrence@codeaurora.org
</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>For open source bzip2/decompress.c
The following commit
commit 403050abcc091260be2e8f58484e7a39c0782b47
Author: Daniel Berlin <<a href="mailto:dberlin@dberlin.org">dberlin@dberlin.org</a>>
Date: Tue Feb 3 20:37:08 2015 +0000
Allow PRE to insert no-cost phi nodes
git-svn-id: <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_svn_llvm-2Dproject_llvm_trunk-26-2364-3B228024&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=-72aCF-i-W5CS7H3RX5n1zTTcCMpfN8PSBfoS02BtS8&s=aK7nmGOiifvRQsh4BPJhS768BWReJSNnr1MM3C49SEY&e=">https://llvm.org/svn/llvm-project/llvm/trunk@228024</a>
91177308-0d34-0410-b5e6-96231b3b80d8
Transformed a lot of
x= GEP base, constant, constant
==>
x.pre = PHI .......
Which introduced two new long live range (base is live anyway) for each of
those GEP.
Bzip2/decompress originally has a lot of long live range already, this
transformation brought in even more, which increased the number of Spill/Reload
from 5xx to 3xxx.</pre>
</div>
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