<html>
<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 - [LoopInterchange] Loops should not interchanged due to control flow"
href="https://bugs.llvm.org/show_bug.cgi?id=48057">48057</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[LoopInterchange] Loops should not interchanged due to control flow
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</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>Loop Optimizer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>chengeng5@huawei.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>$ clang -mllvm -enable-loopinterchange=true -O2 reproducer.c -w && ./a.out
0
$ clang -mllvm -enable-loopinterchange=false -O2 reproducer.c -w && ./a.out
5
$ clang -O0 reproducer.c -w && ./a.out
5
reproducer.c:
#include <stdio.h>
char b[][8] = {{}, {}, {}, {}, {5}, {}, 2, 3};
int c, d;
short e;
static char f() {
for (; c <= 7; c++) {
d = 4;
for (; d; d--)
b[d + 2][c] && (e = b[d][0]);
}
}
int main() {
f();
printf("%d\n", e);
}</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>