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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Opt component crashes using -simplifycfg -sroa -jump-threading -lcssa -loop-unroll"
href="https://bugs.llvm.org/show_bug.cgi?id=47813">47813</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Opt component crashes using -simplifycfg -sroa -jump-threading -lcssa -loop-unroll
</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>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>suochenyao@163.com
</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>description:
Hi,
I guess I find a bug in clang.
Opt component crashes when using "-simplifycfg -sroa -jump-threading -lcssa
-loop-unroll".
But it doesn't occur under O0-O3 levels.
-----------------------------------------------------------------------------
clang version:
$ /home/suocy/bin/llvm-dev/bin/clang --version
clang version 12.0.0 (/home/suocy/src/llvm-dev/llvm-project/llvm/tools/clang
568035ac3955790aee2a5dbc2b1f4074c76bb4d7)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/suocy/bin/llvm-dev/bin
-----------------------------------------------------------------------------
command line:
$ /home/suocy/bin/llvm-dev/bin/clang -c -emit-llvm -O3 -mllvm
-disable-llvm-optzns a.c -o a.bc
a.c:31:22: warning: expression result unused [-Wunused-value]
k[3][0][1];
~~~~~~~ ~^
a.c:32:14: warning: equality comparison result unused [-Wunused-comparison]
&n == &n;
~~~^~~~~
2 warnings generated.
$
$ /home/suocy/bin/llvm-dev/bin/opt -simplifycfg -sroa -jump-threading -lcssa
-loop-unroll a.bc -o a.opt.bc
PHI nodes must have at least one entry. If the block is dead, the PHI should
be removed!
%retval.3 = phi i32
in function i
LLVM ERROR: Broken function found, compilation aborted!
PLEASE submit a bug report to <a href="https://bugs.llvm.org/">https://bugs.llvm.org/</a> and include the crash
backtrace.
Stack dump:
0. Program arguments: /home/suocy/bin/llvm-dev/bin/opt -simplifycfg -sroa
-jump-threading -lcssa -loop-unroll a.bc -o a.opt.bc
1. Running pass 'Function Pass Manager' on module 'a.bc'.
2. Running pass 'Module Verifier' on function '@i'
#0 0x00000000029d923c llvm::sys::PrintStackTrace(llvm::raw_ostream&, int)
(/home/suocy/bin/llvm-dev/bin/opt+0x29d923c)
#1 0x00000000029d71e4 llvm::sys::RunSignalHandlers()
(/home/suocy/bin/llvm-dev/bin/opt+0x29d71e4)
#2 0x00000000029d7343 SignalHandler(int)
(/home/suocy/bin/llvm-dev/bin/opt+0x29d7343)
#3 0x00007f67f3c2f630 __restore_rt (/lib64/libpthread.so.0+0xf630)
#4 0x00007f67f281d387 raise (/lib64/libc.so.6+0x36387)
#5 0x00007f67f281ea78 abort (/lib64/libc.so.6+0x37a78)
#6 0x000000000294e964 llvm::report_fatal_error(llvm::Twine const&, bool)
(/home/suocy/bin/llvm-dev/bin/opt+0x294e964)
#7 0x000000000294ea98 (/home/suocy/bin/llvm-dev/bin/opt+0x294ea98)
#8 0x00000000022b658f (anonymous
namespace)::VerifierLegacyPass::runOnFunction(llvm::Function&)
(/home/suocy/bin/llvm-dev/bin/opt+0x22b658f)
#9 0x000000000223b7e8 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/suocy/bin/llvm-dev/bin/opt+0x223b7e8)
#10 0x000000000223c289 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/suocy/bin/llvm-dev/bin/opt+0x223c289)
#11 0x000000000223b093 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/suocy/bin/llvm-dev/bin/opt+0x223b093)
#12 0x000000000071ee5e main (/home/suocy/bin/llvm-dev/bin/opt+0x71ee5e)
#13 0x00007f67f2809555 __libc_start_main (/lib64/libc.so.6+0x22555)
#14 0x00000000007cfb75 _start (/home/suocy/bin/llvm-dev/bin/opt+0x7cfb75)
Aborted
$
$ /home/suocy/bin/llvm-dev/bin/opt -O0 a.bc -o a.opt.bc
$ /home/suocy/bin/llvm-dev/bin/opt -O1 a.bc -o a.opt.bc
$ /home/suocy/bin/llvm-dev/bin/opt -O2 a.bc -o a.opt.bc
$ /home/suocy/bin/llvm-dev/bin/opt -O3 a.bc -o a.opt.bc
$ /home/suocy/bin/llvm-dev/bin/opt -Os a.bc -o a.opt.bc
-----------------------------------------------------------------------------
program:
union a {
short b;
short c;
};
int d=1, e=1;
long f=1L, g=1L;
long (h)() {
return 0;
}
int i() {
union a j;
j.c=1;
for (;; j.c = h()) {
long k[4][3][4] = {g};
k[3][0][1] = g;
d = 0;
for (; d >= 0;)
return 0;
for (;;) {
if (j.c)
;
else {
int l=2;
int *m = &l;
int **n = &m;
for (; f;) {
for (; e;)
k[3][0][1];
&n == &n;
return 0;
}
}
if (j.b)
break;
}
}
return 0;
}
int main() {
return 0;
}</pre>
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