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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 --- - PowerPC DAG Pattern Instruction Selection Slowdown in LLVM 3.7"
href="https://llvm.org/bugs/show_bug.cgi?id=25153">25153</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>PowerPC DAG Pattern Instruction Selection Slowdown in LLVM 3.7
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>3.7
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>matt.davis@pgroup.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=15059" name="attach_15059" title="Optimized llvm ir test">attachment 15059</a> <a href="attachment.cgi?id=15059&action=edit" title="Optimized llvm ir test">[details]</a></span>
Optimized llvm ir test
I have noted a considerable slowdown from llvm 3.5 regarding llc processing
optimized files. Compiling the attached .llvm file went from ~15 seconds to ~3
minutes.
LLVM 3.7
--------
Compile: llvm/3.7/bin/llc test.ll -mcpu=native -O2 -o test.s -time-passes
Total: 3 Minutes with 190.9secs User Time in PowerPC DAG->DAG Pattern
Instruction Selection
Compile: llvm/3.7/bin/llc test_opt.llvm -mcpu=native -O2 -o test.s -time-passes
Total: 6 Seconds with 5.4secs User Time in PowerPC DAG->DAG Pattern
Instruction Selection
LLVM 3.5
--------
Compile: llvm/3.5/bin/llc test.ll -mcpu=native -O2 -o test.s -time-passes
Total: 15 Seconds with 14.5secs User Time in PowerPC DAG->DAG Pattern
Instruction Selection
Compile: llvm/3.5/bin/llc test_opt.llvm -mcpu=native -O2 -o test.s -time-passes
Total: 1.3 Seconds with 1.01secs User Time in PowerPC DAG->DAG Pattern
Instruction Selection</pre>
</div>
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