[LLVMdev] Extract Loop Failing

[Ryan Taylor]

It looks like this problem only exists on nested loops, ideas?


On Thu, Jan 12, 2012 at 11:44 AM, Ryan Taylor <ryta1203 at gmail.com> wrote:

> Is it not a good idea to try and extract loops that have multiple exits?
>
>
> On Thu, Jan 12, 2012 at 10:44 AM, Ryan Taylor <ryta1203 at gmail.com> wrote:
>
>> 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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