Created attachment 87199 [details]
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:
********************
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:
********************
The suggestion on the chat has been using TargetLowering to handle this issue.
(See
http://llvm.org/docs/doxygen/html/structllvm_1_1TargetLowering_1_1TargetLoweringOpt.html
for details).
Following come some examples of llvm ir that produces crashes despite being
generated by clang from valid opencl programs.