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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 - [LoopInterchange] Tightly nested checking issue"
href="https://bugs.llvm.org/show_bug.cgi?id=48113">48113</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[LoopInterchange] Tightly nested checking issue
</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 -Os -mllvm -enable-loopinterchange=true issue.c && ./a.out
9
clang -Os -mllvm -enable-loopinterchange=false issue.c && ./a.out
3
issue.c:
#include <stdio.h>
char a, d;
int b[][2];
char c[][9];
char *e;
static unsigned f;
short g;
static long h() {
for (; f <= 2; f++) {
char *i = &d;
int j = 0;
for (; j <= 2; j++)
b[j][1] = c[j][f];
++*i;
if (a)
g = *e;
}
}
int main() {
h();
printf("%lX\n", d);
}</pre>
</div>
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