<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 - clang crashes on valid code at -O2 and -O3: fatal error: error in backend: Broken function found, compilation aborted!"
href="https://bugs.llvm.org/show_bug.cgi?id=41004">41004</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang crashes on valid code at -O2 and -O3: fatal error: error in backend: Broken function found, compilation aborted!
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</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>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>su@cs.ucdavis.edu
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>This appears to be a recent regression (tested with trunk revision 355665).
$ cltrunk -v
clang version 9.0.0 (<a href="http://llvm.org/git/clang.git">http://llvm.org/git/clang.git</a>
60510251f0c7e121e59a5477103c53e69833ca56) (<a href="http://llvm.org/git/llvm.git">http://llvm.org/git/llvm.git</a>
bbf63cf4c3d836f8aa59d84cd010b80896d37493)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/su/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.4.0
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/6.0.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.0.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$
$ cltrunk -Os small.c
$
$ cltrunk -O2 small.c
Instruction does not dominate all uses!
%math = extractvalue { i32, i1 } %6, 0
%add.i = add i32 %math, %mul.i
in function main
fatal error: error in backend: Broken function found, compilation aborted!
clang-8: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 9.0.0 (<a href="http://llvm.org/git/clang.git">http://llvm.org/git/clang.git</a>
60510251f0c7e121e59a5477103c53e69833ca56) (<a href="http://llvm.org/git/llvm.git">http://llvm.org/git/llvm.git</a>
bbf63cf4c3d836f8aa59d84cd010b80896d37493)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/su/bin
clang-8: 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-8: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-8: note: diagnostic msg: /tmp/small-61ad2e.c
clang-8: note: diagnostic msg: /tmp/small-61ad2e.sh
clang-8: note: diagnostic msg:
********************
$
-----------------------------------------------
int a, *c = &a, d, e;
unsigned b;
void f ()
{
int g = 1, *h[2] = { &g };
*c = e;
if (*c)
{
int i = d % 2 * ((1 && g) / b) + ~-a;
if (a < 1)
{
i = a;
if (i)
goto L;
}
a = i;
L:
;
}
}
int main ()
{
f ();
return 0;
}</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>