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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - loop and casting causes clang to hang at -O2"
href="http://llvm.org/bugs/show_bug.cgi?id=15738">15738</a>
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<th>Summary</th>
<td>loop and casting causes clang to hang at -O2
</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>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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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>LLVM Codegen
</td>
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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>
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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>The following testcase causes current clang trunk to go into and infinite loop
(hang) when compiled at -O2 and above.
$ clang -v
clang version 3.3 (trunk 179371)
Target: x86_64-pc-linux-gnu
Thread model: posix
$ clang -O1 -c small.c
$ clang -O2 -c small.c
^C
$ cat small.c
struct
{
int f0;
}
a;
int b, c, d, e;
void fn1 ();
void fn2 ()
{
fn1 ();
}
void
fn1 ()
{
int *f = &c, *g = &a.f0;
*g = (int)f;
b = 0;
for (; b != 60; ++b)
{
e = (*g > (d = 0)) % 5;
*g = 0 == e - *g * 80;
}
}</pre>
</div>
</p>
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