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View Code? Open in Web Editor NEW(e)Z80 backend for llvm - Moved to https://github.com/jacobly0/llvm-project
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Crash with -O1 and above on llvm::InstrEmitter::EmitRegSequence (InstrEmitter.cpp)
Crash with -O1 and above with this code:
#include <stdint.h>
extern char* foo(void**);
void test(uint16_t num)
{
uint16_t bar = (num <= 0xFF) ? num : num+1;
void* ptr = &bar;
foo(&ptr);
}Note 1: it crashes only with the value 0xFF in the num <= 0xFF comparison. Any other number, lower or higher, works fine.
Note 2: it doesn't crash at all if num is a uint24_t.
Assertion failed:
../../lib/CodeGen/SelectionDAG/InstrEmitter.cpp:642: void llvm::InstrEmitter::EmitRegSequence(llvm::SDNode*, llvm::DenseMap<llvm::SDValue, unsigned int>&, bool, bool):
Assertion `(NumOps & 1) == 1 && "REG_SEQUENCE must have an odd number of operands!"' failed.Backtrace:
<libc things>
#8 0x00000381d963fdeb llvm::InstrEmitter::EmitRegSequence(llvm::SDNode*, llvm::DenseMap<llvm::SDValue, unsigned int, llvm::DenseMapInfo<llvm::SDValue>, llvm::detail::DenseMapPair<llvm::SDValue, unsigned int> >&, bool, bool) (/usr/lib/../lib/libLLVMSelectionDAG.so.5+0xbcdeb)
#9 0x00000381d9640ed0 llvm::InstrEmitter::EmitMachineNode(llvm::SDNode*, bool, bool, llvm::DenseMap<llvm::SDValue, unsigned int, llvm::DenseMapInfo<llvm::SDValue>, llvm::detail::DenseMapPair<llvm::SDValue, unsigned int> >&) (/usr/lib/../lib/libLLVMSelectionDAG.so.5+0xbded0)
#10 0x00000381d96e8445 llvm::ScheduleDAGSDNodes::EmitSchedule(llvm::MachineInstrBundleIterator<llvm::MachineInstr, false>&) (/usr/lib/../lib/libLLVMSelectionDAG.so.5+0x165445)
#11 0x00000381d976ec7b llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/usr/lib/../lib/libLLVMSelectionDAG.so.5+0x1ebc7b)
#12 0x00000381d976f503 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&) (/usr/lib/../lib/libLLVMSelectionDAG.so.5+0x1ec503)
#13 0x00000381d9777dbe llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/usr/lib/../lib/libLLVMSelectionDAG.so.5+0x1f4dbe)
#14 0x00000381d9779d91 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) [clone .part.986] (/usr/lib/../lib/libLLVMSelectionDAG.so.5+0x1f6d91)
#15 0x00000381dea6c347 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/usr/lib/libLLVMCodeGen.so.5+0x1f1347)
#16 0x00000381de4772b3 llvm::FPPassManager::runOnFunction(llvm::Function&) (/usr/lib/libLLVMCore.so.5+0x16f2b3)
#17 0x00000381de47735c llvm::FPPassManager::runOnModule(llvm::Module&) (/usr/lib/libLLVMCore.so.5+0x16f35c)
#18 0x00000381de477b8a llvm::legacy::PassManagerImpl::run(llvm::Module&) (/usr/lib/libLLVMCore.so.5+0x16fb8a)
#19 0x00000381db2ff5ca (anonymous namespace)::EmitAssemblyHelper::EmitAssembly(clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream> >) (/usr/lib/libclangCodeGen.so.5+0xbd5ca)
<...>Steps:
0. Program arguments: /opt/llvm/build/Debug/bin/clang-5.0 -cc1 -triple ez80 -S -disable-free -main-file-name test.c -mrelocation-model static -mthread-model posix -fmath-errno -no-integrated-as -mconstructor-aliases -target-cpu ez80 -momit-leaf-frame-pointer -dwarf-column-info -debugger-tuning=gdb -coverage-notes-file /-.gcno -resource-dir /opt/llvm/build/Debug/lib/clang/5.0.0 -D interrupt=__attribute__((__interrupt__)) -D double=float -D reentrant= -I /opt/CEdev/include/ -I /opt/CEdev/include/compat -O3 -w -fno-dwarf-directory-asm -fdebug-compilation-dir / -ferror-limit 19 -fmessage-length 0 -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -o - -x c <...>/test.c
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module '<...>/test.c'.
4. Running pass 'Z80 DAG->DAG Instruction Selection' on function '@test'Crash with -O1 and above on llvm::MachineRegisterInfo::createVirtualRegister (MachineRegisterInfo.cpp)
Crash with -O1 and above with this code:
#include <stdbool.h>
bool test(bool foo)
{
volatile bool bar = foo || false;
return foo || bar;
}Assertion failed:
clang-5.0: ../../lib/CodeGen/MachineRegisterInfo.cpp:124: unsigned int llvm::MachineRegisterInfo::createVirtualRegister(const llvm::TargetRegisterClass*)
Assertion `RegClass->isAllocatable() && "Virtual register RegClass must be allocatable."' failed.Backtrace:
<libc things>
#9 0x000003c0441cd377 llvm::ScheduleDAGSDNodes::EmitPhysRegCopy(llvm::SUnit*, llvm::DenseMap<llvm::SUnit*, unsigned int, llvm::DenseMapInfo<llvm::SUnit*>, llvm::detail::DenseMapPair<llvm::SUnit*, unsigned int> >&, llvm::MachineInstrBundleIterator<llvm::MachineInstr, false>) (/usr/lib/../lib/libLLVMSelectionDAG.so.5+0x161377)
#10 0x000003c0441d1462 llvm::ScheduleDAGSDNodes::EmitSchedule(llvm::MachineInstrBundleIterator<llvm::MachineInstr, false>&) (/usr/lib/../lib/libLLVMSelectionDAG.so.5+0x165462)
#11 0x000003c044257c7b llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/usr/lib/../lib/libLLVMSelectionDAG.so.5+0x1ebc7b)
#12 0x000003c044258503 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&) (/usr/lib/../lib/libLLVMSelectionDAG.so.5+0x1ec503)
#13 0x000003c044260dbe llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/usr/lib/../lib/libLLVMSelectionDAG.so.5+0x1f4dbe)
#14 0x000003c044262d91 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) [clone .part.986] (/usr/lib/../lib/libLLVMSelectionDAG.so.5+0x1f6d91)
#15 0x000003c049555347 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (/usr/lib/libLLVMCodeGen.so.5+0x1f1347)
#16 0x000003c048f602b3 llvm::FPPassManager::runOnFunction(llvm::Function&) (/usr/lib/libLLVMCore.so.5+0x16f2b3)
#17 0x000003c048f6035c llvm::FPPassManager::runOnModule(llvm::Module&) (/usr/lib/libLLVMCore.so.5+0x16f35c)
#18 0x000003c048f60b8a llvm::legacy::PassManagerImpl::run(llvm::Module&) (/usr/lib/libLLVMCore.so.5+0x16fb8a)
#19 0x000003c045de85ca (anonymous namespace)::EmitAssemblyHelper::EmitAssembly(clang::BackendAction, std::unique_ptr<llvm::raw_pwrite_stream, std::default_delete<llvm::raw_pwrite_stream> >) (/usr/lib/libclangCodeGen.so.5+0xbd5ca)
<...>Steps:
0. Program arguments: /opt/llvm/build/Debug/bin/clang-5.0 -cc1 -triple ez80 -S -disable-free -main-file-name test.c -mrelocation-model static -mthread-model posix -fmath-errno -no-integrated-as -mconstructor-aliases -target-cpu ez80 -momit-leaf-frame-pointer -dwarf-column-info -debugger-tuning=gdb -coverage-notes-file /-.gcno -resource-dir /opt/llvm/build/Debug/lib/clang/5.0.0 -D interrupt=__attribute__((__interrupt__)) -D double=float -D reentrant= -I /opt/CEdev/include/ -I /opt/CEdev/include/compat -O3 -w -fno-dwarf-directory-asm -fdebug-compilation-dir / -ferror-limit 19 -fmessage-length 0 -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -o - -x c <...>/test.c
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module '<...>/test.c'.
4. Running pass 'Z80 DAG->DAG Instruction Selection' on function '@test'TODO list
Some bugs/things we saw over time:
- Support of
doubletype.
Temporary (?) workaround:#define double float - Register allocation
Some things still manage to break it. For instance, minilua ("fatal error: error in backend: ran out of registers during register allocation") - ...
[Question] How to use/is it usable?
And how do I access the screen on my ti-84+ce with this?
Add support for fasmg in clang/lib/Driver/ToolChains
Right now, only the ZDS assembler is supported, but that's been made obsolete with fasmg, so it'd be nice to be able to use that.
Would also make things easier for TI-Planet's Project Builder when I decide to finally update the toolchain...
user guide?
Hello,
Any advice on how to use it?
Cheers,
Paul
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