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<head>
<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 on valid code at -O2 and -O3 on x86_64-linux-gnu running pass 'X86 DAG->DAG Instruction Selection'"
href="https://bugs.llvm.org/show_bug.cgi?id=33715">33715</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang crashes on valid code at -O2 and -O3 on x86_64-linux-gnu running pass 'X86 DAG->DAG Instruction Selection'
</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 should be a very recent regression.
$ clang -v
clang version 5.0.0 (trunk 307363)
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/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.4
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
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/4.7.3
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/4.9.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.2.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$
$ clang -O2 -c small.c
clang-5.0:
/tmp/llvm-builder/llvm-source-trunk/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp:2984:
llvm::SDValue llvm::DAGTypeLegalizer::convertMask(llvm::SDValue, llvm::EVT,
llvm::EVT): Assertion `(InMaskOpc == ISD::SETCC || (isLogicalMaskOp(InMaskOpc)
&& isSETCCorConvertedSETCC(InMask->getOperand(0)) &&
isSETCCorConvertedSETCC(InMask->getOperand(1)))) && "Unexpected mask
argument."' failed.
#0 0x00000000022575ea llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/local/clang-trunk/bin/clang-5.0+0x22575ea)
#1 0x000000000225577e llvm::sys::RunSignalHandlers()
(/usr/local/clang-trunk/bin/clang-5.0+0x225577e)
#2 0x00000000022558e0 SignalHandler(int)
(/usr/local/clang-trunk/bin/clang-5.0+0x22558e0)
#3 0x00007febcbd7d330 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x10330)
#4 0x00007febcab66c37 gsignal
/build/eglibc-MjiXCM/eglibc-2.19/signal/../nptl/sysdeps/unix/sysv/linux/raise.c:56:0
#5 0x00007febcab6a028 abort
/build/eglibc-MjiXCM/eglibc-2.19/stdlib/abort.c:91:0
#6 0x00007febcab5fbf6 __assert_fail_base
/build/eglibc-MjiXCM/eglibc-2.19/assert/assert.c:92:0
#7 0x00007febcab5fca2 (/lib/x86_64-linux-gnu/libc.so.6+0x2fca2)
#8 0x0000000002a76e0f llvm::DAGTypeLegalizer::convertMask(llvm::SDValue,
llvm::EVT, llvm::EVT) (/usr/local/clang-trunk/bin/clang-5.0+0x2a76e0f)
#9 0x0000000002a7f729
llvm::DAGTypeLegalizer::WidenVSELECTAndMask(llvm::SDNode*)
(/usr/local/clang-trunk/bin/clang-5.0+0x2a7f729)
#10 0x0000000002abc7d5
llvm::DAGTypeLegalizer::PromoteIntOp_SELECT(llvm::SDNode*, unsigned int)
(/usr/local/clang-trunk/bin/clang-5.0+0x2abc7d5)
#11 0x0000000002adaf7d
llvm::DAGTypeLegalizer::PromoteIntegerOperand(llvm::SDNode*, unsigned int)
(/usr/local/clang-trunk/bin/clang-5.0+0x2adaf7d)
#12 0x0000000002a5abea llvm::DAGTypeLegalizer::run()
(/usr/local/clang-trunk/bin/clang-5.0+0x2a5abea)
#13 0x0000000002a5b3fa llvm::SelectionDAG::LegalizeTypes()
(/usr/local/clang-trunk/bin/clang-5.0+0x2a5b3fa)
#14 0x0000000002a20729 llvm::SelectionDAGISel::CodeGenAndEmitDAG()
(/usr/local/clang-trunk/bin/clang-5.0+0x2a20729)
#15 0x0000000002a2949a
llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&)
(/usr/local/clang-trunk/bin/clang-5.0+0x2a2949a)
#16 0x0000000002a2b714
llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) [clone
.part.1130] (/usr/local/clang-trunk/bin/clang-5.0+0x2a2b714)
#17 0x0000000001691e04 (anonymous
namespace)::X86DAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&)
(/usr/local/clang-trunk/bin/clang-5.0+0x1691e04)
#18 0x0000000001adc585
llvm::MachineFunctionPass::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang-5.0+0x1adc585)
#19 0x0000000001ddf9a3 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/usr/local/clang-trunk/bin/clang-5.0+0x1ddf9a3)
#20 0x0000000001ddfa4c llvm::FPPassManager::runOnModule(llvm::Module&)
(/usr/local/clang-trunk/bin/clang-5.0+0x1ddfa4c)
#21 0x0000000001de06ca llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/usr/local/clang-trunk/bin/clang-5.0+0x1de06ca)
#22 0x00000000023e8a18 (anonymous
namespace)::EmitAssemblyHelper::EmitAssembly(clang::BackendAction,
std::unique_ptr<llvm::raw_pwrite_stream,
std::default_delete<llvm::raw_pwrite_stream> >)
(/usr/local/clang-trunk/bin/clang-5.0+0x23e8a18)
#23 0x00000000023e9f41 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+0x23e9f41)
#24 0x0000000002aed5bf
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)
(/usr/local/clang-trunk/bin/clang-5.0+0x2aed5bf)
#25 0x0000000002efc72c clang::ParseAST(clang::Sema&, bool, bool)
(/usr/local/clang-trunk/bin/clang-5.0+0x2efc72c)
#26 0x0000000002aeca60 clang::CodeGenAction::ExecuteAction()
(/usr/local/clang-trunk/bin/clang-5.0+0x2aeca60)
#27 0x0000000002790016 clang::FrontendAction::Execute()
(/usr/local/clang-trunk/bin/clang-5.0+0x2790016)
#28 0x00000000027636b6
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/usr/local/clang-trunk/bin/clang-5.0+0x27636b6)
#29 0x000000000282b2e2
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/usr/local/clang-trunk/bin/clang-5.0+0x282b2e2)
#30 0x0000000000c8f5f8 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/usr/local/clang-trunk/bin/clang-5.0+0xc8f5f8)
#31 0x0000000000c2c712 main (/usr/local/clang-trunk/bin/clang-5.0+0xc2c712)
#32 0x00007febcab51f45 __libc_start_main
/build/eglibc-MjiXCM/eglibc-2.19/csu/libc-start.c:321:0
#33 0x0000000000c8afe9 _start (/usr/local/clang-trunk/bin/clang-5.0+0xc8afe9)
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 -O2
-fdebug-compilation-dir /home/su -ferror-limit 19 -fmessage-length 116
-fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics
-vectorize-loops -vectorize-slp -o small.o -x c small.c
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module 'small.c'.
4. Running pass 'X86 DAG->DAG Instruction Selection' 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 307363)
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-c9c965.c
clang-5.0: note: diagnostic msg: /tmp/small-c9c965.sh
clang-5.0: note: diagnostic msg:
********************
$
------------------------------------------
int a, b;
void f ()
{
int d, e;
for (b = 0; b < 23; b++)
{
e = b ? 1 % b : 0;
d = e || 4 > (5 >> e) ? 0 : 4;
a ^= d;
}
}</pre>
</div>
</p>
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