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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Performance regression when LTO is enabled"
href="http://llvm.org/bugs/show_bug.cgi?id=20004">20004</a>
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<th>Summary</th>
<td>Performance regression when LTO is enabled
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.4
</td>
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<th>Hardware</th>
<td>Macintosh
</td>
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<th>OS</th>
<td>MacOS X
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<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>LLVM Codegen
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>learnopengles@gmail.com
</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>Without LTO:
clang PerformanceTest.cpp dsp.cpp -std=c++11 -ffast-math -O3 -o PerformanceTest
Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
Target: x86_64-apple-darwin13.2.0
Thread model: posix
Iterations: 955
C results: 100,043,846 shorts per second.
With LTO:
clang PerformanceTest.cpp dsp.cpp -std=c++11 -ffast-math -flto -O3 -o
PerformanceTest
Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
Target: x86_64-apple-darwin13.2.0
Thread model: posix
Iterations: 586
C results: 61,349,033 shorts per second.
Code can be downloaded from here:
<a href="https://gist.github.com/learnopengles/004ff4eee75057ca006c">https://gist.github.com/learnopengles/004ff4eee75057ca006c</a></pre>
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