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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 (both 32-bit and 64-bit modes)"
href="http://llvm.org/bugs/show_bug.cgi?id=17076">17076</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>wrong code (SIGFPE) at -O3 on x86_64-linux-gnu (both 32-bit and 64-bit modes)
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<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>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<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>
<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 current clang trunk (as well as clang 3.2
and 3.3) on x86_64-linux-gnu at -O3 (in both 32-bit and 64-bit modes),
resulting in a SIGFPE.
It may be related to 17073, but this one also fails for 64-bit mode.
$ clang-trunk -v
clang version 3.4 (trunk 189735)
$ clang-trunk -O2 small.c
$ a.out
$ 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
Floating point exception (core dumped)
$
-----------------------------------------------
int printf (const char *, ...);
volatile int a, j, m, n;
int b, c, d, e, g, h, *i, k;
unsigned short f;
void foo ()
{
for (; c > -19; c--)
for (b = 0; b < 1; b++)
{
short l = a;
k = j = g | (0 <= (h |= 1));
l = f == 0 ? 1 : 1 / f;
e = ~(l + c);
for (d = 0; d; d = 1)
*i = 0;
}
}
int main ()
{
int o = 0;
if (n)
o = 1;
foo ();
for (; m; m++)
if (o)
printf ("%d\n", 0);
return 0;
}</pre>
</div>
</p>
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