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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang crashes on valid code at -Os and above on x86_64-linux-gnu: fatal error: error in backend: Broken function found, compilation aborted!"
href="https://bugs.llvm.org/show_bug.cgi?id=39718">39718</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang crashes on valid code at -Os and above on x86_64-linux-gnu: 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>Tested with trunk revision 347212.
$ clangpolly -v
clang version 8.0.0 (<a href="http://llvm.org/git/clang.git">http://llvm.org/git/clang.git</a>
8ab54153b8c32d61c5c2251ae490940cbe47a6cc) (<a href="http://llvm.org/git/llvm.git">http://llvm.org/git/llvm.git</a>
23ff23942df1b56bc58b0282ec762f2aa62c7406)
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
$
$ clangpolly -O1 small.c; ./a.out
$
$ clangpolly -Os small.c
Instruction does not dominate all uses!
%spec.select = zext i1 %not.tobool2 to i8
%and = and i8 %0, %spec.select
in function main
fatal error: error in backend: Broken function found, compilation aborted!
clang-6: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 8.0.0 (<a href="http://llvm.org/git/clang.git">http://llvm.org/git/clang.git</a>
8ab54153b8c32d61c5c2251ae490940cbe47a6cc) (<a href="http://llvm.org/git/llvm.git">http://llvm.org/git/llvm.git</a>
23ff23942df1b56bc58b0282ec762f2aa62c7406)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/su/bin
clang-6: 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: 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: note: diagnostic msg: /tmp/small-8cd6d5.c
clang-6: note: diagnostic msg: /tmp/small-8cd6d5.sh
clang-6: note: diagnostic msg:
********************
$
------------------------------------
char a, e, f;
int b, c, d;
char g (char h)
{
return h == 0 ? a : a % h;
}
int main ()
{
for (; d; d++)
b = g (e & (f && (c = 1)));
return 0;
}</pre>
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