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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - GVN Compile time 10% regression caused by revision 176408"
href="http://llvm.org/bugs/show_bug.cgi?id=15540">15540</a>
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<th>Summary</th>
<td>GVN Compile time 10% regression caused by revision 176408
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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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>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Core LLVM classes
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>yi.jiang.llvm@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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</tr></table>
<p>
<div>
<pre>Here is how we build the compiler,
1) We check out source revision 176407 and revision 176408 from trunk.
2) We configure and build the compiler.
The example is originated from TraverseSchema.cpp in 483.xalancbmk (SEPC2006)
We first generate -O0 .bc file and apply two opt respectively. Please see the
attachment common.ll.
$OPT -Os common.bc --time-passes -o /dev/null
Here is the result:
r176407
---User Time--- --System Time-- --User+System-- ---Wall Time--- ---
Name ---
0.1039 ( 14.7%) 0.0006 ( 2.3%) 0.1045 ( 14.3%) 0.1044 ( 14.3%)
Global Value Numbering
r176408
---User Time--- --System Time-- --User+System-- ---Wall Time--- ---
Name ---
0.1170 ( 16.2%) 0.0006 ( 2.4%) 0.1176 ( 15.7%) 0.1175 ( 15.7%)
Global Value Numbering
It shows more than 10% regression on this case.</pre>
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