ppc64-lv2 target is non-functional #169283
Description
The ppc64-lv2 target more or less seems completely dysfunctional, I found a previous related issue that is still open (#52826), and realize there's probably not much interest in fixing it due to it being a fairly niche platform.
That said, I'm still including a reduced IR test case that crashes, in case there's any future interest in addressing it - if not, maybe the target should simply be removed outright.
; ModuleID = 'bugpoint-reduced-instructions.bc' source_filename = "reduced.ll" target datalayout = "E-m:e-p:32:32-Fi64-i64:64-i128:128-n32:64" target triple = "ppc64-unknown-lv2-unknown" @__anon_1820 = external constant [7 x i8] define { ptr, i64 } @__ubsan_handle_add_overflow() { Entry: ret { ptr, i64 } { ptr @__anon_1820, i64 6 } }And here's the bugpoint output for the test case:
Error running tool: /usr/bin/llc -o bugpoint-test-program-081c012.bc-ade953a.llc.s bugpoint-test-program-081c012.bc LLVM ERROR: Cannot select: 0x560754081000: i64 = any_extend 0x560754081310 0x560754081310: i64,ch = PPCISD::TOC_ENTRY<(load (s64) from got)> TargetGlobalAddress:i32<ptr @__anon_1820> 0, Register:i64 $x2 In function: __ubsan_handle_add_overflow PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace. Stack dump: 0. Program arguments: /usr/bin/llc -o bugpoint-test-program-081c012.bc-ade953a.llc.s bugpoint-test-program-081c012.bc 1. Running pass 'Function Pass Manager' on module 'bugpoint-test-program-081c012.bc'. 2. Running pass 'PowerPC DAG->DAG Pattern Instruction Selection' on function '@__ubsan_handle_add_overflow' #0 0x00007f632c70832d llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /usr/src/debug/llvm/llvm-21.1.5.src/lib/Support/Unix/Signals.inc:834:22 #1 0x00007f632c705407 llvm::sys::RunSignalHandlers() /usr/src/debug/llvm/llvm-21.1.5.src/lib/Support/Signals.cpp:104:20 #2 0x00007f632c705407 SignalHandler /usr/src/debug/llvm/llvm-21.1.5.src/lib/Support/Unix/Signals.inc:409:31 #3 0x00007f632b63e4d0 (/usr/lib/libc.so.6+0x3e4d0) #4 0x00007f632b69890c __pthread_kill_implementation /usr/src/debug/glibc/glibc/nptl/pthread_kill.c:44:76 #5 0x00007f632b63e3a0 raise /usr/src/debug/glibc/glibc/signal/../sysdeps/posix/raise.c:27:6 #6 0x00007f632b62557a abort /usr/src/debug/glibc/glibc/stdlib/abort.c:85:3 #7 0x00007f632c33f1be std::mutex::lock() /usr/include/c++/15.2.1/bits/std_mutex.h:119:22 #8 0x00007f632c33f1be std::lock_guard<std::mutex>::lock_guard(std::mutex&) /usr/include/c++/15.2.1/bits/std_mutex.h:252:23 #9 0x00007f632c33f1be llvm::install_bad_alloc_error_handler(void (*)(void*, char const*, bool), void*) /usr/src/debug/llvm/llvm-21.1.5.src/lib/Support/ErrorHandling.cpp:162:61 #10 0x00007f632d47cb0e llvm::SelectionDAGISel::CannotYetSelect(llvm::SDNode*) /usr/src/debug/llvm/llvm-21.1.5.src/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:4439:14 #11 0x00007f632d47ed23 llvm::SelectionDAGISel::SelectCodeCommon(llvm::SDNode*, unsigned char const*, unsigned int) /usr/src/debug/llvm/llvm-21.1.5.src/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:4344:24 #12 0x00007f6330bf9818 llvm::TrackingMDRef::untrack() /usr/src/debug/llvm/llvm-21.1.5.src/include/llvm/IR/TrackingMDRef.h:89:9 #13 0x00007f6330bf9818 llvm::TrackingMDRef::~TrackingMDRef() /usr/src/debug/llvm/llvm-21.1.5.src/include/llvm/IR/TrackingMDRef.h:55:29 #14 0x00007f6330bf9818 llvm::TypedTrackingMDRef<llvm::MDNode>::~TypedTrackingMDRef() /usr/src/debug/llvm/llvm-21.1.5.src/include/llvm/IR/TrackingMDRef.h:106:26 #15 0x00007f6330bf9818 llvm::DebugLoc::~DebugLoc() /usr/src/debug/llvm/llvm-21.1.5.src/include/llvm/IR/DebugLoc.h:124:9 #16 0x00007f6330bf9818 llvm::SDLoc::~SDLoc() /usr/src/debug/llvm/llvm-21.1.5.src/include/llvm/CodeGen/SelectionDAGNodes.h:1225:7 #17 0x00007f6330bf9818 Select /usr/src/debug/llvm/llvm-21.1.5.src/lib/Target/PowerPC/PPCISelDAGToDAG.cpp:6378:1 #18 0x00007f632d477499 llvm::SelectionDAGISel::DoInstructionSelection() /usr/src/debug/llvm/llvm-21.1.5.src/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:1273:28 #19 0x00007f632d484533 llvm::TimeRegion::~TimeRegion() /usr/src/debug/llvm/llvm-21.1.5.src/include/llvm/Support/Timer.h:162:9 #20 0x00007f632d484533 llvm::NamedRegionTimer::~NamedRegionTimer() /usr/src/debug/llvm/llvm-21.1.5.src/include/llvm/Support/Timer.h:170:8 #21 0x00007f632d484533 llvm::SelectionDAGISel::CodeGenAndEmitDAG() /usr/src/debug/llvm/llvm-21.1.5.src/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:1112:3 #22 0x00007f632d48795a llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) /usr/src/debug/llvm/llvm-21.1.5.src/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:1891:33 #23 0x00007f632d4891a4 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) /usr/src/debug/llvm/llvm-21.1.5.src/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:605:22 #24 0x00007f6330c018d1 runOnMachineFunction /usr/src/debug/llvm/llvm-21.1.5.src/lib/Target/PowerPC/PPCISelDAGToDAG.cpp:172:5 #25 0x00007f632d47706b llvm::OptLevelChanger::~OptLevelChanger() /usr/src/debug/llvm/llvm-21.1.5.src/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:267:7 #26 0x00007f632d47706b llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&) /usr/src/debug/llvm/llvm-21.1.5.src/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:373:1 #27 0x00007f632d47706b llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&) /usr/src/debug/llvm/llvm-21.1.5.src/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:345:6 #28 0x00007f632cd10b75 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) /usr/src/debug/llvm/llvm-21.1.5.src/lib/CodeGen/MachineFunctionPass.cpp:108:30 #29 0x00007f632c9050a3 llvm::FPPassManager::runOnFunction(llvm::Function&) /usr/src/debug/llvm/llvm-21.1.5.src/lib/IR/LegacyPassManager.cpp:1398:40 #30 0x00007f632c905283 llvm::ilist_detail::node_base_prevnext<llvm::ilist_node_base<false, void>, false>::getNext() const /usr/src/debug/llvm/llvm-21.1.5.src/include/llvm/ADT/ilist_node_base.h:28:38 #31 0x00007f632c905283 llvm::ilist_node_impl<llvm::ilist_detail::node_options<llvm::Function, false, false, void, false, void>>::getNext() /usr/src/debug/llvm/llvm-21.1.5.src/include/llvm/ADT/ilist_node.h:119:66 #32 0x00007f632c905283 llvm::ilist_iterator<llvm::ilist_detail::node_options<llvm::Function, false, false, void, false, void>, false, false>::operator++() /usr/src/debug/llvm/llvm-21.1.5.src/include/llvm/ADT/ilist_iterator.h:187:25 #33 0x00007f632c905283 llvm::FPPassManager::runOnModule(llvm::Module&) /usr/src/debug/llvm/llvm-21.1.5.src/lib/IR/LegacyPassManager.cpp:1443:22 #34 0x00007f632c9045a2 runOnModule /usr/src/debug/llvm/llvm-21.1.5.src/lib/IR/LegacyPassManager.cpp:1513:38 #35 0x00007f632c9045a2 llvm::legacy::PassManagerImpl::run(llvm::Module&) /usr/src/debug/llvm/llvm-21.1.5.src/lib/IR/LegacyPassManager.cpp:531:55 #36 0x00005607288ca8f9 (/usr/bin/llc+0x1d8f9) #37 0x00005607288bf6e1 main (/usr/bin/llc+0x126e1) #38 0x00007f632b627635 __libc_start_call_main /usr/src/debug/glibc/glibc/csu/../sysdeps/nptl/libc_start_call_main.h:74:3 #39 0x00007f632b6276e9 call_init /usr/src/debug/glibc/glibc/csu/../csu/libc-start.c:128:20 #40 0x00007f632b6276e9 __libc_start_main /usr/src/debug/glibc/glibc/csu/../csu/libc-start.c:347:5 #41 0x00005607288c0ee5 _start (/usr/bin/llc+0x13ee5) *** Debugging code generator crash! *** Attempting to reduce the number of function attributes in the testcase Checking for crash with changing conditionals to always jump to true: Entry: <llc><crash> Checking for crash with changing conditionals to always jump to false: Entry: <llc><crash> Checking for crash with only these blocks: Entry: <llc><crash> Checking for crash with CFG simplifying: Entry: <llc><crash> *** Attempting to reduce testcase by deleting instructions: Simplification Level #1 *** Attempting to reduce testcase by deleting instructions: Simplification Level #0 Checking for crash with metadata retained from 1 instruction: <llc><crash> Emitted bitcode to 'bugpoint-reduced-instructions.bc' *** Attempting to strip the debug info: <llc><crash> *** Attempting to strip the debug type info: <llc><crash> *** Attempting to remove named metadata: Emitted bitcode to 'bugpoint-reduced-named-md.bc' *** Attempting to perform final cleanups: <llc> Emitted bitcode to 'bugpoint-reduced-simplified.bc'