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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - wrong code (SIGFPE) at -O3 on x86_64-linux-gnu (in 32-bit mode)"
href="http://llvm.org/bugs/show_bug.cgi?id=17073">17073</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>wrong code (SIGFPE) at -O3 on x86_64-linux-gnu (in 32-bit mode)
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>su@cs.ucdavis.edu
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following code is miscompiled by the current clang trunk, clang 3.2, and
clang 3.3 on x86_64-linux-gnu at -O3 in 32-bit mode, resulting in a SIGFPE.
$ clang-trunk -v
clang version 3.4 (trunk 189735)
$ clang-trunk -m32 -O2 small.c
$ a.out
$ clang-trunk -m32 -O3 small.c
$ a.out
Floating point exception (core dumped)
$ clang-3.3 -m32 -O3 small.c
$ a.out
Floating point exception (core dumped)
$ clang-3.2 -m32 -O3 small.c
$ a.out
Floating point exception (core dumped)
$ clang-trunk -m64 -O3 small.c
$ a.out
$
------------------------------------
int a, b, d, e, *f = &b, g, i;
char c;
int
foo (int p1, long long p2)
{
return p2 == 0 ? 0 : p1 % p2;
}
void
bar (int p)
{
lbl:
if (*f)
g = 0;
int **l = &f;
*l = 0;
for (; i < 1; i++)
{
if (i)
goto lbl;
if (foo (2, d || p))
{
int **m = &f;
*m = &e;
}
}
}
int
main ()
{
bar (&c == (void *)&a);
return 0;
}</pre>
</div>
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