Hi, I have developed a small profiler which uses AMD's IBS (Instruction Based Samling) to profile a program. With the help of it, I am able to generate quite detailed information about the program like how many times there is a branch miss for each branch or which instructions are causing a lot of cache misses and several other similar information. Now, I plan to use this information to enable certain optimization flags for GCC. Say for example, now that I know the branch probability I can enable the branch probability optimization flag (similar to gprof). My Goal: is to generate meaningful information from the profiled data for "all" the optimization flags that GCC supports. That is, based on the data should we enable certain optimization or not? My Problem: I am not familiar with many of the optimization flags. The description provided in the GCC manual for each optimization flag is not sufficient for a thorough understanding. Expected Solution: 1. If you can point me to resources where I can find more in-depth information about the optimization flags. 2. Or If you think, this is exciting and you would like to collaborate with me. I am a PhD student and I am pretty good with systems. So, if you have a decent knowledge of compilers, feel free to contact. There are a lot many things we can develop in this area. Regards Parang PS: My apologies in case if you received this email twice. I posted it both on gcc and gcc-help, because both the mailing lists looked appropriate for this posting.
