[LLVMdev] Extract Loop Failing

[Cameron Zwarich]

Filing a bug with a test case would be a good start.

Cameron

On Jan 12, 2012, at 12:14 PM, Ryan Taylor <ryta1203 at gmail.com> wrote:

> 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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