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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - wrong code at -Os and above on x86_64-linux-gnu (affecting trunk and 3.3)"
href="http://llvm.org/bugs/show_bug.cgi?id=17077">17077</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>wrong code at -Os and above on x86_64-linux-gnu (affecting trunk and 3.3)
</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>
<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 and clang 3.3 on
x86_64-linux-gnu at -Os and above in both 32-bit and 64-bit modes.
This is a regression from clang 3.2.
$ clang-trunk -v
clang version 3.4 (trunk 189735)
$ clang-trunk -O1 small.c
$ a.out
0
$ clang-trunk -Os small.c
$ a.out
1
$ clang-3.3 -Os small.c
$ a.out
1
$ clang-3.2 -Os small.c
$ a.out
0
$
-------------------------------------
int printf (const char *, ...);
int a[1], b, c;
int foo (int p)
{
return p == 0 ? 0 : 1 / p;
}
int main ()
{
int *d = &b;
if (foo (d != &a[0]))
{
int *e = &c;
int **f = &d;
*f = e;
}
*d = 1;
printf ("%d\n", b);
return 0;
}</pre>
</div>
</p>
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