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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 - clang crashes with "-mllvm -enable-newgvn": Only PHI nodes may reference their own value!"
href="https://bugs.llvm.org/show_bug.cgi?id=37455">37455</a>
</td>
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<tr>
<th>Summary</th>
<td>clang crashes with "-mllvm -enable-newgvn": Only PHI nodes may reference their own value!
</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>helloqirun@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>It happens at -O2 and above.
$ clang-trunk -v
clang version 7.0.0 (trunk 332220)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
$ clang-trunk -mllvm -enable-newgvn -O2 abc.c
Only PHI nodes may reference their own value!
%mul35 = mul nsw i64 %mul35, %conv34
fatal error: error in backend: Broken function found, compilation aborted!
clang-7: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 7.0.0 (trunk 332220)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
clang-7: note: diagnostic msg: PLEASE submit a bug report to
<a href="https://bugs.llvm.org/">https://bugs.llvm.org/</a> and include the crash backtrace, preprocessed source,
and associated run script.
clang-7: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-7: note: diagnostic msg: /tmp/abc-5f6f17.c
clang-7: note: diagnostic msg: /tmp/abc-5f6f17.sh
clang-7: note: diagnostic msg:
********************
$ cat abc.c
long a, e;
char b;
short c, d;
long *f;
void fn1() {
char g = 6;
char *h = &g;
if (c) {
short *i = &d;
for (; d;)
*h = 3;
for (; a;) {
long j;
if (b)
for (;;) {
e = (j *= c) * (*i ?: *f);
for (; h; h++)
;
*i = 1;
l1:;
}
if (0 >= (0 != (c | g)))
goto l1;
}
}
}</pre>
</div>
</p>
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