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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Extremely slow compilation of static array"
href="http://llvm.org/bugs/show_bug.cgi?id=22171">22171</a>
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<th>Summary</th>
<td>Extremely slow compilation of static array
</td>
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<th>Product</th>
<td>clang
</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>Linux
</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>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>kartynnik@gmail.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=13655" name="attach_13655" title="The Makefile for generating and measuring test cases">attachment 13655</a> <a href="attachment.cgi?id=13655&action=edit" title="The Makefile for generating and measuring test cases">[details]</a></span>
The Makefile for generating and measuring test cases
A static array is initialized with structs containing unordered_sets that are
modified by member functions in place. The compilation takes 4 minutes when
there are 100 elements in the array, and I had not enough patience to wait for
the end of the compilation with 800 elements (in out code base, from where I
have narrowed this down, the compilation of a single file had finished only
after 7+ hours!).
For your convenience, attached is a Makefile that generates a source with a
given amount of elements in the array and measures the compile time for the
given compiler and optimization level, for example:
make COUNT=100 COMPILER=g++ OLEVEL=3
will create _generated100.cpp with 100 elements in the static array and measure
the time it takes g++ -O3 to compile it (on my machine, that is 1 sec).
The defaults are: 800 for COUNT, clang++ for COMPILER, 2 for OLEVEL.
The script requires m4.</pre>
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