[LLVMdev] Extract Loop Failing

[Ryan Taylor]

I am trying to use ExtractLoop() but I am getting segFaults:

0  opt             0x00000000008edc2f
1  opt             0x00000000008edfda
2  libpthread.so.0 0x00007ffe21203c60
3  opt             0x0000000000895ed9 llvm::Value::getName() const + 9
4  LLVMEXITCDFG.so 0x00007ffe202b80d7
5  opt             0x00000000006fc6e7
llvm::LPPassManager::runOnFunction(llvm::Function&) + 1143
6  opt             0x0000000000882557
llvm::FPPassManager::runOnFunction(llvm::Function&) + 551
7  opt             0x00000000008825db
llvm::FPPassManager::runOnModule(llvm::Module&) + 75
8  opt             0x0000000000882197
llvm::MPPassManager::runOnModule(llvm::Module&) + 503
9  opt             0x0000000000882299
llvm::PassManagerImpl::run(llvm::Module&) + 137
10 opt             0x00000000004ac451 main + 4881
11 libc.so.6       0x00007ffe204d9eff __libc_start_main + 255
12 opt             0x000000000049f5f9
Stack dump:
0.    Program arguments: opt -load
/home/ryan/llvm/llvm_core/llvm-2.9/Release/lib/LLVMEXITCDFG.so -exitPass
fix_fft.c.bc -o fix_fft.c.bc
1.    Running pass 'Function Pass Manager' on module 'fix_fft.c.bc'.
2.    Running pass 'Loop Pass Manager' on function '@fix_fft'
3.    Running pass 'CDFG exitPass' on basic block '%bb3'
./optScript.sh: line 46:  2637 Segmentation fault      opt -load
/home/ryan/llvm/llvm_core/llvm-2.9/Release/lib/LLVMEXITCDFG.so -exitPass
$1.bc -o ${1}.bc

If I remove the "deleteLoopFromQueue" function call, it goes over all the
loops (supposedly extracting them) and then segFaults.

How should I properly use this function?
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