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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Performance degradations of several tests from eembc.2.0 suite and Coremark suite on x86 Avoton-1.7 due to ‘[SimplifyCFG] Be more aggressive’"
href="http://llvm.org/bugs/show_bug.cgi?id=22616">22616</a>
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<th>Summary</th>
<td>Performance degradations of several tests from eembc.2.0 suite and Coremark suite on x86 Avoton-1.7 due to ‘[SimplifyCFG] Be more aggressive’
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Scalar Optimizations
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>sergey.k.okunev@gmail.com
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<th>CC</th>
<td>david.l.kreitzer@intel.com, denis.briltz@intel.com, elena.demikhovsky@intel.com, james.molloy@arm.com, llvmbugs@cs.uiuc.edu, michael.m.kuperstein@intel.com, sergos.gnu@gmail.com, zia.ansari@intel.com
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>While our performance testing regressions on tests rgbcmykv2 (more than 20%),
mp4decod, mp2enf32, mp2enfix from eembc.2.0 suite and Coremark test were
detected. Bisect analysis showed LLVM revision 229099 is responsible for these
degradations. This revision enabled ‘[SimplifyCFG] Be more aggressive’ as
described in comments.
commit c76bff0715a253321a33287d8dc319e08f6fee8b
Author: James Molloy <<a href="mailto:james.molloy@arm.com">james.molloy@arm.com</a>>
Date: Fri Feb 13 10:48:30 2015 +0000
[SimplifyCFG] Be more aggressive
Up the phi node folding threshold from a cheap "1" to a meagre "2".
Update tests for extra added selects and slight code churn.
git-svn-id: <a href="https://llvm.org/svn/llvm-project/llvm/trunk@229099">https://llvm.org/svn/llvm-project/llvm/trunk@229099</a>
91177308-0d34-0410-b5e6-96231b3b80d8</pre>
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