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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - wrong code (SIGFPE) on x86_64-linux-gnu (both 32-bit and 64-bit modes)"
href="http://llvm.org/bugs/show_bug.cgi?id=16729">16729</a>
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<tr>
<th>Summary</th>
<td>wrong code (SIGFPE) on x86_64-linux-gnu (both 32-bit and 64-bit modes)
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</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>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<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>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following code is miscompiled by the current clang trunk (as well as clang
3.3) on x86_64-linux-gnu at -O3 (also at -O2 for clang trunk) in both 32-bit
and 64-bit modes, resulting in a SIGFPE. This is a regression from clang 3.2.
$ clang-trunk -v
clang version 3.4 (trunk 187322)
Target: x86_64-pc-linux-gnu
Thread model: posix
$ clang-trunk -O2 small.c
$ a.out
Floating point exception (core dumped)
$ clang-trunk -O3 small.c
$ a.out
Floating point exception (core dumped)
$ clang-3.3 -O3 small.c
$ a.out
Floating point exception (core dumped)
$ clang-3.2 -O3 small.c
$ a.out
0
$
----------------------------------------------------
int printf (const char *, ...);
unsigned int *a[1], *c, **const d = &a[0];
int b, e, f;
int main ()
{
int g;
unsigned int **h = &c;
for (; f < 8; ++f)
{
e = h == d;
g = e == 0 ? 0 : 1 / e;
b |= g;
}
printf ("%d\n", 0);
return 0;
}</pre>
</div>
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