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<head>
<base href="https://bugs.llvm.org/">
</head>
<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 -O3 with -fexperimental-new-pass-manager"
href="https://bugs.llvm.org/show_bug.cgi?id=35025">35025</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>wrong code at -O3 with -fexperimental-new-pass-manager
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</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>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>Tested with trunk rev. 316262.
$ clangpolly -v
clang version 6.0.0 (<a href="http://llvm.org/git/clang.git">http://llvm.org/git/clang.git</a>
a6d3ef724655a64ac137945615d3ff002c4f7993) (<a href="http://llvm.org/git/llvm.git">http://llvm.org/git/llvm.git</a>
3aad6fd98b60114347bcfdeaeded7987ec5b629e)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/su/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
$
$ clangpolly -fexperimental-new-pass-manager -O2 -w small.c; ./a.out
2
2
$
$ clangpolly -fexperimental-new-pass-manager -O3 -w small.c; ./a.out
2
0
$
-------------------------------------------------------------
int printf (const char *, ...);
int a, b, c, d, e, *f, **g = &f, ***k = &g, h, j, l, o, p;
short i[2], m, n;
int r (int s)
{
return a < 0 || s ? s : s << a;
}
static void t (int *s)
{
for (e = 0; e < 5; e++)
{
int *u = &b;
for (j = 0; j < 2; j++)
i[j] = 0;
for (l = 0; l < 2; l++)
{
int *v = &c;
**k = s;
for (d = 0; d < 5; d++)
for (m = 0; m < 2; m++)
{
short *w = &n;
(i[m] |= j) <= (*w |= *u = r ((short) (*v |= 6) >> h));
o = *s;
if (o)
break;
}
}
}
}
void x ()
{
int *q = &b;
t (q);
}
int main ()
{
x ();
for (; p < 2; p++)
printf ("%d\n", i[0]);
return 0;
}</pre>
</div>
</p>
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