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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - pcsa.f and csa.f from xplor-nih compile ~100x too slowly using -fplugin-arg-dragonegg-llvm-option=-vectorize"
href="http://llvm.org/bugs/show_bug.cgi?id=15222">15222</a>
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<th>Summary</th>
<td>pcsa.f and csa.f from xplor-nih compile ~100x too slowly using -fplugin-arg-dragonegg-llvm-option=-vectorize
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<th>Product</th>
<td>dragonegg
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>Macintosh
</td>
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<th>OS</th>
<td>MacOS X
</td>
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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
</td>
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<th>Component</th>
<td>New Bugs
</td>
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<tr>
<th>Assignee</th>
<td>baldrick@free.fr
</td>
</tr>
<tr>
<th>Reporter</th>
<td>howarth@nitro.med.uc.edu
</td>
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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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<pre>Created <span class=""><a href="attachment.cgi?id=9989" name="attach_9989" title="test cases exposing the vectorization bottleneck">attachment 9989</a> <a href="attachment.cgi?id=9989&action=edit" title="test cases exposing the vectorization bottleneck">[details]</a></span>
test cases exposing the vectorization bottleneck
The attached code from xplor-nih takes an abnormally long time to compile with
-fplugin-arg-dragonegg-llvm-option=-vectorize under dragonegg...
% time de-gfortran47 -c pcsa.f -Ofast
-fplugin-arg-dragonegg-llvm-option=-vectorize -fdefault-integer-8
-ffixed-line-length-120 -fno-second-underscore
80.241u 0.237s 1:20.49 99.9% 0+0k 0+22io 0pf+0w
% time de-gfortran47 -c csa.f -Ofast
-fplugin-arg-dragonegg-llvm-option=-vectorize -fdefault-integer-8
-ffixed-line-length-120 -fno-second-underscore
285.138u 0.573s 4:45.73 99.9% 0+0k 0+13io 0pf+0w
compared to the normal compilation without vectorization...
% time de-gfortran47 -c pcsa.f -Ofast -fdefault-integer-8
-ffixed-line-length-120 -fno-second-underscore
0.560u 0.043s 0:00.60 100.0% 0+0k 0+20io 0pf+0w
% time de-gfortran47 -c csa.f -Ofast -fdefault-integer-8
-ffixed-line-length-120 -fno-second-underscore
0.842u 0.059s 0:00.90 98.8% 0+0k 0+10io 0pf+0w
These may be good test cases for finding bottlenecks in the current vectorizor
code. Note that stock gfortran 4.7.2 compiles this same code with vectorization
very rapidly...
% time gfortran-fsf-4.7 -c pcsa.f -Ofast -fdefault-integer-8
-ffixed-line-length-120 -fno-second-underscore
1.187u 0.049s 0:01.29 94.5% 0+0k 1+20io 528pf+0w
% time gfortran-fsf-4.7 -c csa.f -Ofast -fdefault-integer-8
-ffixed-line-length-120 -fno-second-underscore
2.459u 0.083s 0:02.54 99.6% 0+0k 0+8io 0pf+0w
Tested on x86_64-apple-darwin12 with llvm/dragonegg svn at r174816.</pre>
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