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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - wrong code at -O1 and above with -fPIC on x86_64-linux-gnu"
href="https://bugs.llvm.org/show_bug.cgi?id=51683">51683</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>wrong code at -O1 and above with -fPIC on x86_64-linux-gnu
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>zhendong.su@inf.ethz.ch
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>[653] % clangtk -v
clang version 14.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
705d00578128c6089fe05adb175a5306f46c695c)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /local/suz-local/opfuzz/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
[654] %
[654] % clangtk -O1 small.c; ./a.out
[655] %
[655] % clangtk -O1 -fPIC small.c
[656] % ./a.out
Segmentation fault
[657] %
[657] % cat small.c
int printf(const char *, ...);
int a = -2094967296, b = 6, h, i;
char c;
static const int d, *e[2] = {&d, &d};
int f;
unsigned g = 1;
int main() {
int j, k = ~a;
L:;
unsigned m = (2 / ~c) / g;
int o = c = m % b;
if (g >= o && c) {
printf("%d", f);
for (; h; h++)
printf("0");
i = *e[j];
goto L;
}
if (b < 6)
j++;
if (k <= 0)
goto L;
return 0;
}</pre>
</div>
</p>
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