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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Without late-vectorize, clang can run forever and uses ridiculous amounts of memory"
href="http://llvm.org/bugs/show_bug.cgi?id=17525">17525</a>
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<th>Summary</th>
<td>Without late-vectorize, clang can run forever and uses ridiculous amounts of memory
</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>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<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>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>dimitry@andric.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=11353" name="attach_11353" title="Testcase for ns_core memory exhaustion problem">attachment 11353</a> <a href="attachment.cgi?id=11353&action=edit" title="Testcase for ns_core memory exhaustion problem">[details]</a></span>
Testcase for ns_core memory exhaustion problem
I recently received a sample source file from a FreeBSD user, who observed
clang running forever, until all memory was exhausted and the process was
killed, while compiling a Mozilla WebRTC source file. This occurred with clang
3.3 release on the i386 arch, and *only* when compiling with -march=pentium3.
With more recent trunk versions I could not reproduce the problem, so I did
some bisecting, and the revision that 'fixed' it turned out to be r189858
("Enable late-vectorization by default"). However, this just changes the
default setting for late-vectorize, and when you turn it off, the problem can
still be reproduced with trunk r192062.
I reduced the sample to the attached testcase, which should be compiled with
the following flags:
clang -O3 -m32 -march=pentium3 -mllvm -late-vectorize=false -c
This makes clang run forever and eats up all RAM, until it crashes. Other
-march= settings do not exhibit this problem, e.g. pentium2, pentium4, core2,
etc all compile it quickly as expected, and use very little RAM.</pre>
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