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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 at -Os and above on x86_64-linux-gnu"
href="http://llvm.org/bugs/show_bug.cgi?id=16605">16605</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>wrong code at -Os and above on x86_64-linux-gnu
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<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 clang trunk (as well as clang 3.2 and 3.3)
on x86_64-linux-gnu at -Os and above.
$ clang-trunk -v
clang version 3.4 (trunk 186068)
Target: x86_64-pc-linux-gnu
Thread model: posix
$
$ clang-trunk -Os reduced.c
$ a.out; echo $?
1
$ clang-trunk -O1 reduced.c
$ a.out; echo $?
0
$ clang-3.3 -Os reduced.c
$ a.out; echo $?
1
$ clang-3.2 -Os reduced.c
$ a.out; echo $?
1
$
---------------------------------------------------
int a = -1, b;
unsigned int foo (int p) { return p; }
int main ()
{
if ((b = 1 % foo (a)) > a)
return 0;
return 1;
}</pre>
</div>
</p>
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