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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 - clang crashes at -Os and above with "-mllvm -enable-newgvn": Assertion `ProcessedCount[V] < 100 && "Seem to have processed the same Value a lot"' failed"
href="https://bugs.llvm.org/show_bug.cgi?id=33116">33116</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang crashes at -Os and above with "-mllvm -enable-newgvn": Assertion `ProcessedCount[V] < 100 && "Seem to have processed the same Value a lot"' failed
</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>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>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>This appears to be a recent regression.
$ clang -v
clang version 5.0.0 (trunk 303464)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/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
$
$ clang -Os -c -w small.c
$ clang-4.0.0 -Os -mllvm -enable-newgvn -c -w small.c
$
$ clang -Os -mllvm -enable-newgvn -c -w small.c
clang-5.0:
/tmp/llvm-builder/llvm-source-trunk/lib/Transforms/Scalar/NewGVN.cpp:2702: void
{anonymous}::NewGVN::updateProcessedCount(const llvm::Value*): Assertion
`ProcessedCount[V] < 100 && "Seem to have processed the same Value a lot"'
failed.
#0 0x000000000221f1aa llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang-5.0+0x221f1aa)
#1 0x000000000221cf2e llvm::sys::RunSignalHandlers()
(/usr/local/clang-trunk/bin/clang-5.0+0x221cf2e)
#2 0x000000000221d0a2 SignalHandler(int)
(/usr/local/clang-trunk/bin/clang-5.0+0x221d0a2)
#3 0x00007f2abc1d1390 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x11390)
#4 0x00007f2abaf44428 gsignal
/build/glibc-9tT8Do/glibc-2.23/signal/../sysdeps/unix/sysv/linux/raise.c:54:0
#5 0x00007f2abaf4602a abort /build/glibc-9tT8Do/glibc-2.23/stdlib/abort.c:91:0
#6 0x00007f2abaf3cbd7 __assert_fail_base
/build/glibc-9tT8Do/glibc-2.23/assert/assert.c:92:0
#7 0x00007f2abaf3cc82 (/lib/x86_64-linux-gnu/libc.so.6+0x2dc82)
#8 0x0000000000a59cea bool llvm::isa<llvm::VectorType, llvm::Type*>(llvm::Type*
const&) [clone .isra.48] [clone .part.49]
(/usr/local/clang-trunk/bin/clang-5.0+0xa59cea)
#9 0x0000000002116671 (anonymous
namespace)::NewGVN::iterateTouchedInstructions()
(/usr/local/clang-trunk/bin/clang-5.0+0x2116671)
#10 0x00000000021192ca (anonymous namespace)::NewGVN::runGVN() [clone
.constprop.1270] (/usr/local/clang-trunk/bin/clang-5.0+0x21192ca)
#11 0x000000000211af87 NewGVNLegacyPass::runOnFunction(llvm::Function&) [clone
.part.1264] [clone .constprop.1268]
(/usr/local/clang-trunk/bin/clang-5.0+0x211af87)
#12 0x0000000001d79a33 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang-5.0+0x1d79a33)
#13 0x0000000002c175ae (anonymous
namespace)::CGPassManager::runOnModule(llvm::Module&)
(/usr/local/clang-trunk/bin/clang-5.0+0x2c175ae)
#14 0x0000000001d7959d llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang-5.0+0x1d7959d)
#15 0x00000000023ce379 clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::HeaderSearchOptions const&, clang::CodeGenOptions const&,
clang::TargetOptions const&, clang::LangOptions const&, llvm::DataLayout
const&, llvm::Module*, clang::BackendAction,
std::unique_ptr<llvm::raw_pwrite_stream,
std::default_delete<llvm::raw_pwrite_stream> >)
(/usr/local/clang-trunk/bin/clang-5.0+0x23ce379)
#16 0x0000000002aa80a9
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)
(/usr/local/clang-trunk/bin/clang-5.0+0x2aa80a9)
#17 0x0000000002e693f8 clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang-5.0+0x2e693f8)
#18 0x0000000002aa743f clang::CodeGenAction::ExecuteAction()
(/usr/local/clang-trunk/bin/clang-5.0+0x2aa743f)
#19 0x00000000027680a6 clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang-5.0+0x27680a6)
#20 0x0000000002739ec6
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang-5.0+0x2739ec6)
#21 0x00000000027f3cea
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang-5.0+0x27f3cea)
#22 0x0000000000c9b1e8 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/usr/local/clang-trunk/bin/clang-5.0+0xc9b1e8)
#23 0x0000000000c2e4f0 main (/usr/local/clang-trunk/bin/clang-5.0+0xc2e4f0)
#24 0x00007f2abaf2f830 __libc_start_main
/build/glibc-9tT8Do/glibc-2.23/csu/../csu/libc-start.c:325:0
#25 0x0000000000c978a9 _start (/usr/local/clang-trunk/bin/clang-5.0+0xc978a9)
Stack dump:
0. Program arguments: /usr/local/clang-trunk/bin/clang-5.0 -cc1 -triple
x86_64-unknown-linux-gnu -emit-obj -disable-free -main-file-name small.c
-mrelocation-model static -mthread-model posix -fmath-errno -masm-verbose
-mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64
-momit-leaf-frame-pointer -dwarf-column-info -debugger-tuning=gdb
-coverage-notes-file /home/su/small.gcno -resource-dir
/usr/local/clang-trunk/lib/clang/5.0.0 -internal-isystem /usr/local/include
-internal-isystem /usr/local/clang-trunk/lib/clang/5.0.0/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem /usr/include -Os
-w -fdebug-compilation-dir /home/su -ferror-limit 19 -fmessage-length 120
-fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics
-vectorize-loops -vectorize-slp -mllvm -enable-newgvn -o small.o -x c small.c
1. <eof> parser at end of file
2. Per-module optimization passes
3. Running pass 'CallGraph Pass Manager' on module 'small.c'.
4. Running pass 'Global Value Numbering' on function '@f'
clang-5.0: error: unable to execute command: Aborted (core dumped)
clang-5.0: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 5.0.0 (trunk 303464)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/bin
clang-5.0: 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-5.0: note: diagnostic msg:
********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-5.0: note: diagnostic msg: /tmp/small-8f4b0a.c
clang-5.0: note: diagnostic msg: /tmp/small-8f4b0a.sh
clang-5.0: note: diagnostic msg:
********************
$
-----------------------------------
int a, b, c, d, e;
void f ()
{
int g = 1, h = 0;
while (c)
for (g = 0; g; g--)
h = b;
if (h > 0)
goto L1;
while (e)
{
int j = g, *k[1];
k[d] = &g;
L2:
if (g)
{
L1:
e;
if (!g)
{
a++;
continue;
}
}
if (j)
goto L2;
}
}</pre>
</div>
</p>
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