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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - 22% performance degradation in SciMark2's Sparse matmult benchmark"
href="http://llvm.org/bugs/show_bug.cgi?id=22589">22589</a>
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<th>Summary</th>
<td>22% performance degradation in SciMark2's Sparse matmult benchmark
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.6
</td>
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<th>Hardware</th>
<td>Macintosh
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>howarth.mailing.lists@gmail.com
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>There is a serious 22% performance degradation in the code generated for the
Sparse matmult benchmark of SciMark2 in the 3.6 release branch clang compiler
as well as the current svn trunk clang compiler.
Building the sources from <a href="http://math.nist.gov/scimark2/scimark2_1c.zip">http://math.nist.gov/scimark2/scimark2_1c.zip</a> with...
make CFLAGS="-O3 -march=native"
on x86_64-apple-darwin14 reveals timings of...
998.439+/-0.482 for the clang 3.5.1 release compilers
1217.363+/-1.1004 for the clang 3.6 release branch compilers
This problem not to exist in current llvm/clang svn trunk.
989.315+/-0.686
I'll try to do a inverse-regression hunt in current trunk and see at what
recent commit the performance regression in the Sparse matmult benchmark
disappeared.</pre>
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