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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - wrong code at -O2 on x86_64-linux-gnu"
href="https://bugs.llvm.org/show_bug.cgi?id=50621">50621</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>wrong code at -O2 on x86_64-linux-gnu
</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>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>qrzhang@gatech.edu
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>It appears to be a recent regression.
$ clang-trunk -v
clang version 13.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
61a2d6bfe48cf3da4b95d1383bf866690287f8e8)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
$ clang-trunk abc.c ; ./a.out
0
$ clang-trunk -O2 abc.c ; ./a.out
1
$ cat abc.c
short b, e;
int c, d, g;
int f[] = {2, 6, 0, 4};
void(h)();
int main() {
short a[] = {3, 2, 3};
f[2] = h || b;
for (; g <= 1; g++) {
e = 3;
for (; e; e--) {
d = 1;
if (a[g] < f[e])
d = a[g + 1] = c;
else
break;
}
}
printf("%d\n", d);
}</pre>
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</p>
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