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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - non-terminating loop at -Os causes clang to hang"
href="http://llvm.org/bugs/show_bug.cgi?id=15479">15479</a>
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<th>Summary</th>
<td>non-terminating loop at -Os causes clang to hang
</td>
</tr>
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<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>
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<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>
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<th>Reporter</th>
<td>dhazeghi@yahoo.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following code (derived from a test generated by csmith) causes
top-of-trunk clang to get stuck in an infinite loop when compiled at -Os or
higher. At -O1 or below, the compilation succeeds. This may be related for
15386 but that bug only triggers at -O2 or higher.
$ clang-trunk -v
clang version 3.3 (trunk 176687)
Target: x86_64-pc-linux-gnu
Thread model: posix
$ clang-trunk -O1 -c crash8.c
$ clang-trunk -Os -c crash8.c
<hangs>
$ cat crash8.c
int a, b;
int fn1 (int p1, unsigned char p2)
{
return p1 * p2;
}
int fn3();
void fn2 ()
{
int c;
for (;;)
{
c ^= a &= 1;
if (fn3 ())
c = 0;
else
b = b;
c = fn1 (b > 0, c);
}
}</pre>
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</p>
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