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...void * CriticalAntiDepBreaker has replaced T9_64 with S6_64 to break an anti-dependence edge. This code is incorrect since the first operand of JALR64 has to be T9_64 in PIC mode. After further investigation, I found that the flag for T9_64 of CriticalAntiDepBreaker::KeepRegs that had been set in PrescanInstruction was reset in ScanInstruction, which I think is causing the problem: *CriticalAntiDepBreaker.cpp: 00154 PrescanInstruction(MI); 00155 ScanInstruction(MI, Count); *T9_64 is cleared in CriticalAntiDepBreaker.cpp:264: *Breakpoint 8, llvm::CriticalAntiDepBreaker::ScanInstruction (this=0x262d29...

Hi, I wondered whether the AggressiveAntiDepBreaker can properly handle predicated instructions. At the end of PrescanInstruction the "DefIndices" array is updated with the destination register without checking whether the instruction is predicated. That shortens the live range: Later on, in HandleLastUse we check whether the register IsLive, which considers only "KillIndices" and "DefIndices&q...

I saw there is reference to dead def on registers in LLVM source code. I am not aware of this concept from the traditional course material. What are the properties of dead def? Cheers Thomson -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150101/ea39d1e4/attachment.html>

...chineOperand(llvm::MachineOperand const*, unsigned int) in libLLVMCodeGen.a(MachineVerifier.cpp.o) llvm::AggressiveAntiDepBreaker::ScanInstruction(llvm::MachineInstr*, unsigned int)in libLLVMCodeGen.a(AggressiveAntiDepBreaker.cpp.o) llvm::AggressiveAntiDepBreaker::PrescanInstruction(llvm::MachineInstr*, unsigned int, std::set<unsigned int, std::less<unsigned int>, std::allocator<unsigned int> >&)in libLLVMCodeGen.a(AggressiveAntiDepBreaker.cpp.o) llvm::CriticalAntiDepBreaker::ScanInstruction(llvm::MachineInstr*, unsigned int)in libLLVMCodeGen.a(C...