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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 in CFLAA on x86_64-linux-gnu (with either "-mllvm -use-cfl-aa=anders" or "-mllvm -use-cfl-aa=steens")"
href="https://bugs.llvm.org/show_bug.cgi?id=33410">33410</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>wrong code at -O1 and above in CFLAA on x86_64-linux-gnu (with either "-mllvm -use-cfl-aa=anders" or "-mllvm -use-cfl-aa=steens")
</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>
<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>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>su@cs.ucdavis.edu
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>This one seems interesting as it affects all versions from 3.9.x to trunk and
both "anders" and "steens", so I'm reporting it.
$ clang -v
clang version 5.0.0 (trunk 305165) (llvm/trunk 305163)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.4.0
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6.0.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.0.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$
$ clang -O1 -w small.c; ./a.out
0
$
$ clang -O1 -mllvm -use-cfl-aa=steens -w small.c; ./a.out
Aborted (core dumped)
$ clang -O1 -mllvm -use-cfl-aa=anders -w small.c; ./a.out
Aborted (core dumped)
$
-----------------------------------------------
int printf (const char *, ...);
int a, b, c, *d, *e, *g = &c, i, ***j, k;
static int ****f;
int **volatile h = &g;
void fn1 (int);
int fn2 ()
{
fn1 (0);
if (b >= 0)
return i;
while (1)
*e = *d = 0;
}
void fn1 (int q)
{
int *n = 0, **o[7] = { &n };
for (; k < 2; k++)
{
j = &o[6];
*h = n;
if (g)
__builtin_abort ();
}
if (q)
{
***f;
int *****p = &f;
if (p[3])
;
}
}
int main ()
{
fn2 ();
printf ("%d\n", a);
return 0;
}</pre>
</div>
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