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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - UNREACHABLE executed at /usr/src/contrib/llvm-project/llvm/lib/Target/PowerPC/PPCCTRLoops.cpp:214!"
href="https://bugs.llvm.org/show_bug.cgi?id=48527">48527</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>UNREACHABLE executed at /usr/src/contrib/llvm-project/llvm/lib/Target/PowerPC/PPCCTRLoops.cpp:214!
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>FreeBSD
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: PowerPC
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>pkubaj@anongoth.pl
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, nemanja.i.ibm@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>FreeBSD head, powerpc64 (happens also on powerpc, powerpcspe and powerpc64le),
llvm 11.0.0
Happens during build of ceph 12.2.12.
Test case:
template <class a> struct b { typedef a c; };
typedef enum { j } d;
struct e {
_Atomic(int) f;
} g;
class h {
public:
bool m_fn1() const;
int k;
};
bool h::m_fn1() const {
int l;
for (int i = 0; i < k; ++i) {
d m = j, o = m;
int n;
using p = b<decltype(g.f)>::c *;
n = __c11_atomic_load(p(&g), o);
l = n;
char af = n;
if (af)
return false;
}
return true;
}
class q {
bool r() const;
h s;
};
struct t {
long ah;
long ai;
};
__thread t aj;
#define ak(al, am) aj.al = am;
bool q::r() const {
if (s.m_fn1())
ak(ah, 1) else ak(ai, 1) return false;
}
Execute:
/usr/bin/c++ -cc1 -triple powerpc64-unknown-freebsd13.0 -emit-obj -O2
plain_table_reader-ca874a.cpp
Result:
Invalid PPC CTR loop!
UNREACHABLE executed at
/usr/src/contrib/llvm-project/llvm/lib/Target/PowerPC/PPCCTRLoops.cpp:214!
PLEASE submit a bug report to <a href="https://bugs.freebsd.org/submit/">https://bugs.freebsd.org/submit/</a> and include the
crash backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /usr/bin/c++ -cc1 -triple
powerpc64-unknown-freebsd13.0 -emit-obj -O2 plain_table_reader-ca874a.cpp
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module
'plain_table_reader-ca874a.cpp'.
4. Running pass 'PowerPC CTR Loops Verify' on function '@_ZNK1q1rEv'
#0 0x00000000140a5c7c PrintStackTrace
/usr/src/contrib/llvm-project/llvm/lib/Support/Unix/Signals.inc:564:13
#1 0x00000000140a3268 RunSignalHandlers
/usr/src/contrib/llvm-project/llvm/lib/Support/Signals.cpp:67:5
#2 0x00000000140a684c SignalHandler
/usr/src/contrib/llvm-project/llvm/lib/Support/Unix/Signals.inc:0:3
#3 0x0000000815ecba80 handle_signal /usr/src/lib/libthr/thread/thr_sig.c:303:3
Abort trap (core dumped)</pre>
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