1. Download and install LLVM-3.4 and the Clang frontend (version 3.4) following the instructions given in the Getting Started manual.

• Compile LLVM with the debug flag set (e.g. ./configure --disable-optimized followed by make -j4)

2. Following the Getting Started Quickly (A Summary) you should have a build directory in /path_to_llvm_directory.
3. Check, if the HelloWorld Example is working. (optionally)

1. Create a new directory in /path_to_llvm_directory/build/lib/Transforms.
2. Clone the code of DFGenTool into that directory.
3. Execute make in the newly created directory DFGenTool.
4. A shared object file named loop_graph_analysis_0.so will be created in /path_to_llvm_directory/build/Debug+Asserts/lib.

Examples are supplied in the example directory of the repository (currently residing in /path_to_llvm_directory/build/lib/Transforms/DFGenTool/). In this section we walk through the simpleAdder

1. Generate a file containing the intemediate code (.ll) execute:

   /path_to_llvm_directory/build/bin/clang -O1 -emit-llvm simpleAdder.c -S -o simpleAdder_generated.ll
   

2. To create a dot file from the intermediate code which can be further processed by graphviz tools, use the following command:

   /path_to_llvm_directory/build/bin/opt -load  /path_to_llvm_directory/built/Debug+Asserts/lib/loop_graph_analysis_0.so -loop-graph-analysis-0 simpleAdder_generated.ll
   

3. Two new files are created in the same directory: 0.loop_analysis_graph.dot and 0.loop_analysis_graph.graph. Compare both dot files containing the flow graphs.