https://bugs.freedesktop.org/show_bug.cgi?id=70199
Priority: medium Bug ID: 70199 Assignee: dri-devel@lists.freedesktop.org Summary: clang+llvm from svn crashes when generating opencl code for 64 bit types Severity: normal Classification: Unclassified OS: All Reporter: klondike@klondike.es Hardware: Other Status: NEW Version: 9.2 Component: Drivers/DRI/R600 Product: Mesa
Created attachment 87199 --> https://bugs.freedesktop.org/attachment.cgi?id=87199&action=edit 64 bit unsigned integer divide it causes the first issue
When generating code from opencl files containing 64 bit integer types the compiler crashes with messages similar to this: 0x67be970: i32 = ExternalSymbol'__udivdi3' Undefined function UNREACHABLE executed at /home/klondike/myllvm/llvm/lib/Target/R600/AMDGPUISelLowering.h:76! 0 clang 0x0000000001d2f795 llvm::sys::PrintStackTrace(_IO_FILE*) + 37 1 clang 0x0000000001d2fbe3 2 libpthread.so.0 0x00000337e68ffbf0 3 libc.so.6 0x00000337e54e5b05 gsignal + 53 4 libc.so.6 0x00000337e54e6f7b abort + 379 5 clang 0x0000000001d1f088 llvm::llvm_unreachable_internal(char const*, char const*, unsigned int) + 440 6 clang 0x0000000001597712 7 clang 0x00000000016696cf llvm::TargetLowering::LowerCallTo(llvm::TargetLowering::CallLoweringInfo&) const + 2511 8 clang 0x000000000168e1b6 llvm::TargetLowering::makeLibCall(llvm::SelectionDAG&, llvm::RTLIB::Libcall, llvm::EVT, llvm::SDValue const*, unsigned int, bool, llvm::SDLoc, bool, bool) const + 806 9 clang 0x0000000001721c5e 10 clang 0x000000000171d390 11 clang 0x00000000016c1823 12 clang 0x00000000016c6964 llvm::SelectionDAG::LegalizeTypes() + 36 13 clang 0x000000000167d6fd llvm::SelectionDAGISel::CodeGenAndEmitDAG() + 1389 14 clang 0x000000000167c909 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) + 6249 15 clang 0x000000000167a3a7 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) + 1319 16 clang 0x00000000017c876c llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 124 17 clang 0x0000000001c6f3d3 llvm::FPPassManager::runOnFunction(llvm::Function&) + 355 18 clang 0x0000000001c6f64b llvm::FPPassManager::runOnModule(llvm::Module&) + 43 19 clang 0x0000000001c6f994 llvm::MPPassManager::runOnModule(llvm::Module&) + 420 20 clang 0x0000000001c7003b llvm::PassManagerImpl::run(llvm::Module&) + 539 21 clang 0x0000000001c701aa llvm::PassManager::run(llvm::Module&) + 10 22 clang 0x0000000000808137 clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::Module*, clang::BackendAction, llvm::raw_ostream*) + 6167 23 clang 0x0000000000805ab3 24 clang 0x000000000096db63 clang::ParseAST(clang::Sema&, bool, bool) + 515 25 clang 0x0000000000804f12 clang::CodeGenAction::ExecuteAction() + 514 26 clang 0x0000000000682461 clang::FrontendAction::Execute() + 113 27 clang 0x00000000006607bd clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 909 28 clang 0x00000000006474f5 clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 3077 29 clang 0x000000000063efb4 cc1_main(char const**, char const**, char const*, void*) + 628 30 clang 0x0000000000645454 main + 8500 31 libc.so.6 0x00000337e54d25dd __libc_start_main + 237 32 clang 0x000000000063ec5d Stack dump: 0. Program arguments: /home/klondike/myllvm/build/Release+Asserts/bin/clang -cc1 -triple r600-- -S -disable-free -main-file-name ldiv.cl -mrelocation-model static -mdisable-fp-elim -fmath-errno -mconstructor-aliases -target-cpu redwood -target-linker-version 2.23.1 -coverage-file /home/klondike/opencl-example/- -resource-dir /home/klondike/myllvm/build/Release+Asserts/bin/../lib/clang/3.4 -include clc/clc.h -D cl_clang_storage_class_specifiers -D cl_khr_fp64 -std=cl -fno-dwarf-directory-asm -fdebug-compilation-dir /home/klondike/opencl-example -ferror-limit 19 -fmessage-length 192 -mstackrealign -fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics -vectorize-slp -o - -x cl ldiv.cl 1. <eof> parser at end of file 2. Code generation 3. Running pass 'Function Pass Manager' on module 'ldiv.cl'. 4. Running pass 'AMDGPU DAG->DAG Pattern Instruction Selection' on function '@ldiv' clang: error: unable to execute command: Aborted clang: error: clang frontend command failed due to signal (use -v to see invocation) clang version 3.4 (trunk 192013) Target: r600-- Thread model: posix clang: 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: note: diagnostic msg: ********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT: Preprocessed source(s) and associated run script(s) are located at: clang: note: diagnostic msg: /tmp/ldiv-5f4dde.cl clang: note: diagnostic msg: /tmp/ldiv-5f4dde.sh clang: note: diagnostic msg:
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And this: fatal error: error in backend: Cannot select: 0x5a141e0: ch = store 0x59d1bf0, 0x5a147e0, 0x5a127c0, 0x5a11bc0<ST4[%out+4]> [ORD=2] [ID=26] 0x5a147e0: i32 = add 0x5a146e0, 0x5a145e0 [ORD=1] [ID=23] 0x5a146e0: i32 = add 0x5a143e0, 0x5a144e0 [ORD=1] [ID=20] 0x5a143e0: i32 = mulhu 0x5a124c0, 0x5a120c0 [ORD=1] [ID=16] 0x5a124c0: i32 = CONST_ADDRESS 0x5a123c0 [ID=10] 0x5a123c0: i32 = Constant<8240> [ID=5] 0x5a120c0: i32 = CONST_ADDRESS 0x5a11fc0 [ID=12] 0x5a11fc0: i32 = Constant<8232> [ID=7] 0x5a144e0: i32 = mul 0x5a124c0, 0x5a122c0 [ORD=1] [ID=14] 0x5a124c0: i32 = CONST_ADDRESS 0x5a123c0 [ID=10] 0x5a123c0: i32 = Constant<8240> [ID=5] 0x5a122c0: i32 = CONST_ADDRESS 0x5a121c0 [ID=11] 0x5a121c0: i32 = Constant<8236> [ID=6] 0x5a145e0: i32 = mul 0x5a151f0, 0x5a120c0 [ORD=1] [ID=15] 0x5a151f0: i32 = CONST_ADDRESS 0x5a14fe0 [ID=9] 0x5a14fe0: i32 = Constant<8244> [ID=4] 0x5a120c0: i32 = CONST_ADDRESS 0x5a11fc0 [ID=12] 0x5a11fc0: i32 = Constant<8232> [ID=7] 0x5a127c0: i32 = DWORDADDR 0x5a125c0 [ORD=2] [ID=25] 0x5a125c0: i32 = srl 0x5a14ae0, 0x5a126c0 [ORD=2] [ID=22] 0x5a14ae0: i32 = add 0x5a11ec0, 0x5a149e0 [ORD=2] [ID=19] 0x5a11ec0: i32 = CONST_ADDRESS 0x5a11dc0 [ID=13] 0x5a11dc0: i32 = Constant<8228> [ID=8] 0x5a149e0: i32 = Constant<4> [ID=2] 0x5a126c0: i32 = Constant<2> [ID=3] 0x5a11bc0: i32 = undef [ID=1] In function: lmul clang: error: clang frontend command failed with exit code 70 (use -v to see invocation) clang version 3.4 (trunk 192013) Target: r600-- Thread model: posix clang: 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: note: diagnostic msg: ********************
PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT: Preprocessed source(s) and associated run script(s) are located at: clang: note: diagnostic msg: /tmp/lmul-213f81.cl clang: note: diagnostic msg: /tmp/lmul-213f81.sh clang: note: diagnostic msg:
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The suggestion on the chat has been using TargetLowering to handle this issue. (See http://llvm.org/docs/doxygen/html/structllvm_1_1TargetLowering_1_1TargetLowe... for details).
Following come some examples of llvm ir that produces crashes despite being generated by clang from valid opencl programs.