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  Automatic Function Multi-Versioning for GCC Introduction: For this project, I will be working with the GCC compiler and learning how it works by building it from scratch on an AArch64 platform (which is 64-Bit). Setting up GCC like this lets me dig into how it compiles code and optimizes functions for different CPUs, especially as the goal is to experiment with Automatic Function Multi-Versioning (AFMV). Guide to Building GCC for AArch64 Step 1: Cloning the Source Code To get started, I needed the GCC source code. Cloning from the official GCC repository keeps things organized and up to date. Here’s the command to clone it: git clone git://gcc.gnu.org/git/gcc.git ~/gcc This creates a directory called ~/gcc , where all the source files are stored. The cloning process might take a few minutes, depending on your internet speed. Step 2: Setting Up a Build Directory It’s recommended to create a separate directory for building GCC instead of doing it directly in the source directory. ...
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Building GCC Part 2

This is my attempt to learn and work with GCC as part of my SPO600 course. I’m working on Stage 2 of the project, where I have to create and test a Clone-Pruning Analysis Pass. You can find the first part in my blog page. Creating the Dummy Pass I started by creating a basic pass that should iterates through the program functions and output their names to a dump file.  Iterating Through GIMPLE Statements Next, I added logic to traverse the GIMPLE representation of each function. GIMPLE is an intermediate language used by GCC, and understanding it was crucial for the project. By iterating over the GIMPLE statements within each basic block, I could analyze the structure of functions. This step highlighted the importance of diagnostic dumps, as they provided a detailed view of what the pass was processing. While the GIMPLE code initially felt overwhelming, breaking it down into smaller sections made it easier. Setting Up The first step was to get the provided files into my working dir...
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Project Stage 3 : Part 2

 This part is to cover up for the things that i may have missed in the previous stages. So i extracted both the tar zip files (spo600-gcc-pass-demo and spo600-gcc-pass-demo-2) which extracted 4 files each: The tar file had everything I needed to modify GCC. My professor provided details about which files to change, and I updated four of them: passes.def: Added NEXT_PASS (pass_ctyler); tree-ctyler.cc: Contained the actual pass code. tree-pass.h: Added extern gimple_opt_pass *make_pass_ctyler (gcc::context *ctxt); Makefile.in: Added tree-ctyler.o to the OBJS definition. Both zip files have same files and same code except the execute function in tree-ctyler.cc as shown below; spo600-gcc-pass-demo: unsigned int pass_ctyler :: execute ( function * fun )   {     basic_block bb ;     int bb_cnt = 0 , stmt_cnt = 0 ;     FOR_EACH_BB_FN ( bb , fun )       {         bb_cnt ++ ;         if ( du...
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