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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang hangs at -O2 on infinite loop"
href="http://llvm.org/bugs/show_bug.cgi?id=15921">15921</a>
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<th>Summary</th>
<td>clang hangs at -O2 on infinite loop
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>LLVM Codegen
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dhazeghi@yahoo.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following testcase causes current clang trunk to hang, when compiled at -O2
or higher optimization level.
$ clang -v
clang version 3.3 (trunk 181189)
Target: x86_64-pc-linux-gnu
Thread model: posix
$ clang -Os test.c
$ clang -O2 test.c
<hangs>
$ cat test.c
short a;
int b;
void fn1 (short *p1)
{
b = 15;
for (; b != -15; b = b - 1)
a = *p1 * *p1;
}
int main ()
{
for (;;)
fn1 (&a);
return 0;
}</pre>
</div>
</p>
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