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<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ICE in backend: Instruction Combining seems stuck in an infinite loop after 100 iterations"
href="https://bugs.llvm.org/show_bug.cgi?id=51797">51797</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>ICE in backend: Instruction Combining seems stuck in an infinite loop after 100 iterations
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</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>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>Vsevolod.Livinskij@frtk.ru
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Reproducer:
extern int var_23, var_24;
void test(unsigned char a, unsigned short b, unsigned char c,
signed char d[][24][10][13]) {
for (int e = 0; e < 2; e = 2) {
#pragma clang loop unroll(enable)
for (short f = 0; f < 24; f += 4)
for (char g = 0; g < 10; g += 2)
for (int h = 0; h < 13; h += 2) {
var_23 = b ? 0 : d[0][4][g][h];
var_24 = d[e][4][g][h];
}
for (; c < a;)
;
}
}
Error:
<span class="quote">>$ clang++ -O3 -c func.cpp</span >
fatal error: error in backend: Instruction Combining seems stuck in an infinite
loop after 100 iterations.
PLEASE submit a bug report to <a href="https://bugs.llvm.org/">https://bugs.llvm.org/</a> and include the crash
backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: clang++ -O3 -c func.cpp
1. <eof> parser at end of file
2. Optimizer
#0 0x000055c560730bf4 PrintStackTraceSignalHandler(void*) Signals.cpp:0:0
#1 0x000055c56072e9f4 llvm::sys::CleanupOnSignal(unsigned long)
(/testing/llvm/bin/bin/clang-14+0x243d9f4)
#2 0x000055c560676463 llvm::CrashRecoveryContext::HandleExit(int)
(/testing/llvm/bin/bin/clang-14+0x2385463)
#3 0x000055c560726642 llvm::sys::Process::Exit(int, bool)
(/testing/llvm/bin/bin/clang-14+0x2435642)
#4 0x000055c55f21d0c7 LLVMErrorHandler(void*, std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&, bool) cc1_main.cpp:0:0
#5 0x000055c56067e31c llvm::report_fatal_error(llvm::Twine const&, bool)
(/testing/llvm/bin/bin/clang-14+0x238d31c)
#6 0x000055c5601059ad combineInstructionsOverFunction(llvm::Function&,
llvm::InstCombineWorklist&, llvm::AAResults*, llvm::AssumptionCache&,
llvm::TargetLibraryInfo&, llvm::TargetTransformInfo&, llvm::DominatorTree&,
llvm::OptimizationRemarkEmitter&, llvm::BlockFrequencyInfo*,
llvm::ProfileSummaryInfo*, unsigned int, llvm::LoopInfo*)
InstructionCombining.cpp:0:0
#7 0x000055c560106401 llvm::InstCombinePass::run(llvm::Function&,
llvm::AnalysisManager<llvm::Function>&)
(/testing/llvm/bin/bin/clang-14+0x1e15401)
#8 0x000055c56192b136 llvm::detail::PassModel<llvm::Function,
llvm::InstCombinePass, llvm::PreservedAnalyses,
llvm::AnalysisManager<llvm::Function> >::run(llvm::Function&,
llvm::AnalysisManager<llvm::Function>&)
(/testing/llvm/bin/bin/clang-14+0x363a136)
#9 0x000055c55ff397e6 llvm::PassManager<llvm::Function,
llvm::AnalysisManager<llvm::Function> >::run(llvm::Function&,
llvm::AnalysisManager<llvm::Function>&)
(/testing/llvm/bin/bin/clang-14+0x1c487e6)
#10 0x000055c560a53b56 llvm::detail::PassModel<llvm::Function,
llvm::PassManager<llvm::Function, llvm::AnalysisManager<llvm::Function> >,
llvm::PreservedAnalyses, llvm::AnalysisManager<llvm::Function>
<span class="quote">>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&)</span >
(/testing/llvm/bin/bin/clang-14+0x2762b56)
#11 0x000055c563c6d47f
llvm::CGSCCToFunctionPassAdaptor::run(llvm::LazyCallGraph::SCC&,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&)
(/testing/llvm/bin/bin/clang-14+0x597c47f)
#12 0x000055c561c93de6 llvm::detail::PassModel<llvm::LazyCallGraph::SCC,
llvm::CGSCCToFunctionPassAdaptor, llvm::PreservedAnalyses,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&)
(/testing/llvm/bin/bin/clang-14+0x39a2de6)
#13 0x000055c563c6519b llvm::PassManager<llvm::LazyCallGraph::SCC,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&)
(/testing/llvm/bin/bin/clang-14+0x597419b)
#14 0x000055c5600613e6 llvm::detail::PassModel<llvm::LazyCallGraph::SCC,
llvm::PassManager<llvm::LazyCallGraph::SCC,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>, llvm::PreservedAnalyses,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&)
(/testing/llvm/bin/bin/clang-14+0x1d703e6)
#15 0x000055c563c69024
llvm::DevirtSCCRepeatedPass::run(llvm::LazyCallGraph::SCC&,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&)
(/testing/llvm/bin/bin/clang-14+0x5978024)
#16 0x000055c560061396 llvm::detail::PassModel<llvm::LazyCallGraph::SCC,
llvm::DevirtSCCRepeatedPass, llvm::PreservedAnalyses,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&>::run(llvm::LazyCallGraph::SCC&,
llvm::AnalysisManager<llvm::LazyCallGraph::SCC, llvm::LazyCallGraph&>&,
llvm::LazyCallGraph&, llvm::CGSCCUpdateResult&)
(/testing/llvm/bin/bin/clang-14+0x1d70396)
#17 0x000055c563c66cf3
llvm::ModuleToPostOrderCGSCCPassAdaptor::run(llvm::Module&,
llvm::AnalysisManager<llvm::Module>&)
(/testing/llvm/bin/bin/clang-14+0x5975cf3)
#18 0x000055c560061436 llvm::detail::PassModel<llvm::Module,
llvm::ModuleToPostOrderCGSCCPassAdaptor, llvm::PreservedAnalyses,
llvm::AnalysisManager<llvm::Module> >::run(llvm::Module&,
llvm::AnalysisManager<llvm::Module>&)
(/testing/llvm/bin/bin/clang-14+0x1d70436)
#19 0x000055c55ff35d1f llvm::PassManager<llvm::Module,
llvm::AnalysisManager<llvm::Module> >::run(llvm::Module&,
llvm::AnalysisManager<llvm::Module>&)
(/testing/llvm/bin/bin/clang-14+0x1c44d1f)
#20 0x000055c560064941 llvm::ModuleInlinerWrapperPass::run(llvm::Module&,
llvm::AnalysisManager<llvm::Module>&)
(/testing/llvm/bin/bin/clang-14+0x1d73941)
#21 0x000055c56192b376 llvm::detail::PassModel<llvm::Module,
llvm::ModuleInlinerWrapperPass, llvm::PreservedAnalyses,
llvm::AnalysisManager<llvm::Module> >::run(llvm::Module&,
llvm::AnalysisManager<llvm::Module>&)
(/testing/llvm/bin/bin/clang-14+0x363a376)
#22 0x000055c55ff35d1f llvm::PassManager<llvm::Module,
llvm::AnalysisManager<llvm::Module> >::run(llvm::Module&,
llvm::AnalysisManager<llvm::Module>&)
(/testing/llvm/bin/bin/clang-14+0x1c44d1f)
#23 0x000055c560a64e76 (anonymous
namespace)::EmitAssemblyHelper::EmitAssemblyWithNewPassManager(clang::BackendAction,
std::unique_ptr<llvm::raw_pwrite_stream,
std::default_delete<llvm::raw_pwrite_stream> >) BackendUtil.cpp:0:0
#24 0x000055c560a6a135 clang::EmitBackendOutput(clang::DiagnosticsEngine&,
clang::HeaderSearchOptions const&, clang::CodeGenOptions const&,
clang::TargetOptions const&, clang::LangOptions const&, llvm::StringRef,
llvm::Module*, clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream,
std::default_delete<llvm::raw_pwrite_stream> >)
(/testing/llvm/bin/bin/clang-14+0x2779135)
#25 0x000055c5618a8c6f
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)
(/testing/llvm/bin/bin/clang-14+0x35b7c6f)
#26 0x000055c562a00a79 clang::ParseAST(clang::Sema&, bool, bool)
(/testing/llvm/bin/bin/clang-14+0x470fa79)
#27 0x000055c5618a77a8 clang::CodeGenAction::ExecuteAction()
(/testing/llvm/bin/bin/clang-14+0x35b67a8)
#28 0x000055c561166659 clang::FrontendAction::Execute()
(/testing/llvm/bin/bin/clang-14+0x2e75659)
#29 0x000055c5610f7ade
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/testing/llvm/bin/bin/clang-14+0x2e06ade)
#30 0x000055c561246620
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/testing/llvm/bin/bin/clang-14+0x2f55620)
#31 0x000055c55f21e1b7 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/testing/llvm/bin/bin/clang-14+0xf2d1b7)
#32 0x000055c55f21a658 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&)
driver.cpp:0:0
#33 0x000055c560f81329 void llvm::function_ref<void
()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>
<span class="quote">>, std::__cxx11::basic_string<char, std::char_traits<char>,</span >
std::allocator<char> >*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#34 0x000055c56067632c
llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>)
(/testing/llvm/bin/bin/clang-14+0x238532c)
#35 0x000055c560f81a3d
clang::driver::CC1Command::Execute(llvm::ArrayRef<llvm::Optional<llvm::StringRef>
<span class="quote">>, std::__cxx11::basic_string<char, std::char_traits<char>,</span >
std::allocator<char> >*, bool*) const (.part.0) Job.cpp:0:0
#36 0x000055c560f53c8b
clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&,
clang::driver::Command const*&) const
(/testing/llvm/bin/bin/clang-14+0x2c62c8b)
#37 0x000055c560f54799
clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&,
llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&) const
(/testing/llvm/bin/bin/clang-14+0x2c63799)
#38 0x000055c560f5f899
clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&,
llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*> >&)
(/testing/llvm/bin/bin/clang-14+0x2c6e899)
#39 0x000055c55f194a86 main (/testing/llvm/bin/bin/clang-14+0xea3a86)
#40 0x00007fbaf23810b3 __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x270b3)
#41 0x000055c55f21a1ce _start (/testing/llvm/bin/bin/clang-14+0xf291ce)
clang-14: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 14.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
dfc46f02681447370a1ccbe340034e970bc7e572)
Target: x86_64-unknown-linux-gnu
Thread model: posix
LLVM version:
clang version 14.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
dfc46f02681447370a1ccbe340034e970bc7e572)</pre>
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