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.... With support from GSoC, I would like to integrate our path profiling pass into trunk. Our passes are currently built against LLVM 3.6.2. I am willing to maintain said passes as they form the core of our research infrastructure. Prior Work : Path profiling was implemented by Adam Preuss for LLVM [Preuss10]. However, this was before the unified profiling infrastructure was in place. It seems that the code was removed from trunk post LLVM 3.3. Current Implementation : + HashTable based + Static overflow checks (64 bit counters) at instrumentation time with fallback to APInt counters + Implements effi...