[llvm-bugs] [Bug 34076] New: clang crashes on conversion from __float128 to long double

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Aug 4 16:55:38 PDT 2017 

https://bugs.llvm.org/show_bug.cgi?id=34076

            Bug ID: 34076
           Summary: clang crashes on conversion from __float128 to long
                    double
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: konstantin.belochapka at sony.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 18910
  --> https://bugs.llvm.org/attachment.cgi?id=18910&action=edit
float128.c

clang crashes on assertion in CodeGen when it needs to do a conversion from 
__float128 type to long double type

test052() {
   __float128 f128 = 0;
   long double ld;
   ld = (long double)f128;
}

>clang.r309443 -S float128.c 


clang-6.0:
/data/projects/BUGS/30418/llvm/lib/CodeGen/SelectionDAG/LegalizeFloatTypes.cpp:872:
llvm::SDValue llvm::DAGTypeLegalizer::SoftenFloatOp_FP_ROUND(llvm::SDNode*):
Assertion `LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported FP_ROUND libcall"'
failed.
#0 0x0000000003ebe30f llvm::sys::PrintStackTrace(llvm::raw_ostream&)
/data/projects/BUGS/30418/llvm/lib/Support/Unix/Signals.inc:398:0
#1 0x0000000003ebe3a2 PrintStackTraceSignalHandler(void*)
/data/projects/BUGS/30418/llvm/lib/Support/Unix/Signals.inc:462:0
#2 0x0000000003ebc5e9 llvm::sys::RunSignalHandlers()
/data/projects/BUGS/30418/llvm/lib/Support/Signals.cpp:49:0
#3 0x0000000003ebdb84 SignalHandler(int)
/data/projects/BUGS/30418/llvm/lib/Support/Unix/Signals.inc:252:0
#4 0x00007fba88f5b390 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x11390)
#5 0x00007fba87ccd428 gsignal
/build/glibc-bfm8X4/glibc-2.23/signal/../sysdeps/unix/sysv/linux/raise.c:54:0
#6 0x00007fba87ccf02a abort /build/glibc-bfm8X4/glibc-2.23/stdlib/abort.c:91:0
#7 0x00007fba87cc5bd7 __assert_fail_base
/build/glibc-bfm8X4/glibc-2.23/assert/assert.c:92:0
#8 0x00007fba87cc5c82 (/lib/x86_64-linux-gnu/libc.so.6+0x2dc82)
#9 0x0000000004c84961
llvm::DAGTypeLegalizer::SoftenFloatOp_FP_ROUND(llvm::SDNode*)
/data/projects/BUGS/30418/llvm/lib/CodeGen/SelectionDAG/LegalizeFloatTypes.cpp:874:0
#10 0x0000000004c83f14
llvm::DAGTypeLegalizer::SoftenFloatOperand(llvm::SDNode*, unsigned int)
/data/projects/BUGS/30418/llvm/lib/CodeGen/SelectionDAG/LegalizeFloatTypes.cpp:763:0
#11 0x0000000004c26435 llvm::DAGTypeLegalizer::run()
/data/projects/BUGS/30418/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp:306:0
#12 0x0000000004c2b7c0 llvm::SelectionDAG::LegalizeTypes()
/data/projects/BUGS/30418/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp:1171:0
#13 0x0000000004bd9548 llvm::SelectionDAGISel::CodeGenAndEmitDAG()
/data/projects/BUGS/30418/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:754:0
#14 0x0000000004bd8aed
llvm::SelectionDAGISel::SelectBasicBlock(llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Instruction,
true, false, void>, false, true>,
llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Instruction, true,
false, void>, false, true>, bool&)
/data/projects/BUGS/30418/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:661:0
#15 0x0000000004bde4a5
llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&)
/data/projects/BUGS/30418/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:1609:0
#16 0x0000000004bd7736
llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&)
/data/projects/BUGS/30418/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:467:0
#17 0x0000000002caab31 (anonymous
namespace)::X86DAGToDAGISel::runOnMachineFunction(llvm::MachineFunction&)
/data/projects/BUGS/30418/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp:178:0
#18 0x00000000033381f4
llvm::MachineFunctionPass::runOnFunction(llvm::Function&)
/data/projects/BUGS/30418/llvm/lib/CodeGen/MachineFunctionPass.cpp:62:0
#19 0x00000000037a1a96 llvm::FPPassManager::runOnFunction(llvm::Function&)
/data/projects/BUGS/30418/llvm/lib/IR/LegacyPassManager.cpp:1514:0
#20 0x00000000037a1c2f llvm::FPPassManager::runOnModule(llvm::Module&)
/data/projects/BUGS/30418/llvm/lib/IR/LegacyPassManager.cpp:1535:0
#21 0x00000000037a1faa (anonymous
namespace)::MPPassManager::runOnModule(llvm::Module&)
/data/projects/BUGS/30418/llvm/lib/IR/LegacyPassManager.cpp:1591:0
#22 0x00000000037a26bf llvm::legacy::PassManagerImpl::run(llvm::Module&)
/data/projects/BUGS/30418/llvm/lib/IR/LegacyPassManager.cpp:1694:0
#23 0x00000000037a28cb llvm::legacy::PassManager::run(llvm::Module&)
/data/projects/BUGS/30418/llvm/lib/IR/LegacyPassManager.cpp:1726:0
#24 0x0000000004166c39 (anonymous
namespace)::EmitAssemblyHelper::EmitAssembly(clang::BackendAction,
std::unique_ptr<llvm::raw_pwrite_stream,
std::default_delete<llvm::raw_pwrite_stream> >)
/data/projects/BUGS/30418/llvm/tools/clang/lib/CodeGen/BackendUtil.cpp:790:0
#25 0x0000000004169446 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> >)
/data/projects/BUGS/30418/llvm/tools/clang/lib/CodeGen/BackendUtil.cpp:1142:0
#26 0x0000000004cbc549
clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext&)
/data/projects/BUGS/30418/llvm/tools/clang/lib/CodeGen/CodeGenAction.cpp:263:0
#27 0x00000000059dd9d1 clang::ParseAST(clang::Sema&, bool, bool)
/data/projects/BUGS/30418/llvm/tools/clang/lib/Parse/ParseAST.cpp:161:0
#28 0x00000000047ba305 clang::ASTFrontendAction::ExecuteAction()
/data/projects/BUGS/30418/llvm/tools/clang/lib/Frontend/FrontendAction.cpp:1004:0
#29 0x0000000004cba30c clang::CodeGenAction::ExecuteAction()
/data/projects/BUGS/30418/llvm/tools/clang/lib/CodeGen/CodeGenAction.cpp:993:0
#30 0x00000000047b9d1a clang::FrontendAction::Execute()
/data/projects/BUGS/30418/llvm/tools/clang/lib/Frontend/FrontendAction.cpp:906:0
#31 0x0000000004757c94
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
/data/projects/BUGS/30418/llvm/tools/clang/lib/Frontend/CompilerInstance.cpp:981:0
#32 0x0000000004904a59
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
/data/projects/BUGS/30418/llvm/tools/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:252:0
#33 0x0000000001e6972e cc1_main(llvm::ArrayRef<char const*>, char const*,
void*)
/data/projects/BUGS/30418/llvm/tools/clang/tools/driver/cc1_main.cpp:221:0
#34 0x0000000001e5e935 ExecuteCC1Tool(llvm::ArrayRef<char const*>,
llvm::StringRef)
/data/projects/BUGS/30418/llvm/tools/clang/tools/driver/driver.cpp:306:0
#35 0x0000000001e5f553 main
/data/projects/BUGS/30418/llvm/tools/clang/tools/driver/driver.cpp:387:0
#36 0x00007fba87cb8830 __libc_start_main
/build/glibc-bfm8X4/glibc-2.23/csu/../csu/libc-start.c:325:0
#37 0x0000000001e5bf49 _start
(/data/projects/BUGS/30418/llvm-build/r309443/bin/clang-6.0+0x1e5bf49)
Stack dump:
0.      Program arguments:
/data/projects/BUGS/30418/llvm-build/r309443/bin/clang-6.0 -cc1 -triple
x86_64-unknown-linux-gnu -S -disable-free -main-file-name float128.c
-mrelocation-model static -mthread-model posix -mdisable-fp-elim -fmath-errno
-masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array
-target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -coverage-notes-file
/home/kbelochapka/projects/BUGS/ORBIS/151057/float128.gcno -resource-dir
/data/projects/BUGS/30418/llvm-build/r309443/lib/clang/6.0.0 -internal-isystem
/usr/local/include -internal-isystem
/data/projects/BUGS/30418/llvm-build/r309443/lib/clang/6.0.0/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem /usr/include
-fdebug-compilation-dir /home/kbelochapka/projects/BUGS/ORBIS/151057
-ferror-limit 19 -fmessage-length 145 -fobjc-runtime=gcc
-fdiagnostics-show-option -fcolor-diagnostics -o float128.s -x c float128.c 
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Function Pass Manager' on module 'float128.c'.
4.      Running pass 'X86 DAG->DAG Instruction Selection' on function '@test52'
clang-6.0: error: unable to execute command: Aborted (core dumped)
clang-6.0: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 6.0.0 (trunk 309443)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/kbelochapka/bin
clang-6.0: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and
associated run script.
clang-6.0: note: diagnostic msg:

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