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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": error in backend: Found 2 in/out CFI information errors."
href="https://bugs.llvm.org/show_bug.cgi?id=35253">35253</a>
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</tr>
<tr>
<th>Summary</th>
<td>clang crashes with "-mllvm -enable-newgvn": error in backend: Found 2 in/out CFI information errors.
</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>Linux
</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 with newgvn enabled. Clang trunk works fine.
$ clang-trunk -v
clang version 6.0.0 (trunk 317674)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
$ clang-trunk -mllvm -enable-newgvn -O2 abc.c
abc.c:7:13: warning: | has lower precedence than ==; == will be evaluated first
[-Wparentheses]
b &= p1 | c == p1;
^~~~~~~~~
abc.c:7:13: note: place parentheses around the '==' expression to silence this
warning
b &= p1 | c == p1;
^
( )
abc.c:7:13: note: place parentheses around the | expression to evaluate it
first
b &= p1 | c == p1;
^
( )
abc.c:27:10: warning: expression result unused [-Wunused-value]
*h || 0;
~~ ^ ~
*** The incoming offset of a successor is inconsistent. ***
- function: fn2
- basic block: BB#5 for.body9.split (0x8d28088)
Successor BB#6 has incoming offset (8), while BB#5 has outgoing offset (16).
*** The outgoing offset of a predecessor is inconsistent. ***
- function: fn2
- basic block: BB#6 for.end13 (0x8d28148)
Predecessor BB#5 has outgoing offset (16), while BB#6 has incoming offset (8).
fatal error: error in backend: Found 2 in/out CFI information errors.
clang-6.0: error: clang frontend command failed with exit code 70 (use -v to
see invocation)
clang version 6.0.0 (trunk 317674)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
clang-6.0: note: diagnostic msg: PLEASE submit a bug report to
<a href="http://llvm.org/bugs/">http://llvm.org/bugs/</a> and include the crash backtrace, preprocessed source, and
associated run script.
clang-6.0: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-6.0: note: diagnostic msg: /tmp/abc-c70957.c
clang-6.0: note: diagnostic msg: /tmp/abc-c70957.sh
clang-6.0: note: diagnostic msg:
********************
$ cat abc.c
long a;
short b;
int d;
void fn1(char p1) {
int c = a = 1;
for (; a <= 77; a++) {
b &= p1 | c == p1;
if (b)
p1 | (c = 0) ? a = 5335016568 : 0;
}
}
void fn2() {
char e;
for (; d;) {
long f;
fn1(a <= 0);
for (; a <= 9;)
if (0) {
int *g;
l1:
*g = 2;
}
for (; f <= 8;) {
char *h = &e;
goto l1;
l2:
*h || 0;
}
}
goto l2;
}</pre>
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