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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Miscompilation of functiona call at -Os and above"
href="http://llvm.org/bugs/show_bug.cgi?id=16069">16069</a>
</td>
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<th>Summary</th>
<td>Miscompilation of functiona call at -Os and above
</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>All
</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>
<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 code is miscompiled by clang trunk on x86_64-linux-gnu at -Os and
above, resulting in a SIGFPE when foo() is called.
$ clang-trunk -v
clang version 3.4 (trunk 182209)
Target: x86_64-pc-linux-gnu
Thread model: posix
$ clang-trunk -O1 test.c
$ ./a.out
$ clang-trunk -Os test.c
$ ./a.out
Floating point exception (core dumped)
$
------------
int *a, b, *c, d;
int foo (short p, int q)
{
return q == 0 || (p != 0 && q == 1) ? p : 1 % q;
}
int main ()
{
c = &d;
*c = ((int)&a) == 0;
b = foo (0, d);
return 0;
}</pre>
</div>
</p>
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