[LLVMdev] Indirect call site profiling (original) (raw)

Philip Reames listmail at philipreames.com
Mon Oct 27 09:31:48 PDT 2014

On 10/24/2014 05:26 PM, betulb at codeaurora.org wrote:

Hi All,

We've been working on enhancing LLVM's instrumentation based profiling by adding indirect call target profiling support. Our goal is to add instrumentation around indirect call sites, so that we may track the frequently taken target addresses and their call frequencies. Just to make sure I understand what're you describing, you're doing value profiling specifically for the target address of an indirect call through a function pointer right? The acquired data has uses in optimization of indirect function call heavy applications. Our initial findings show that using the profile data in optimizations would help improve the performance of some of the spec benchmarks notably. We have a proof of concept implementation, which we plan to put it up for review. However, I’d like to inquire prior if there are any plans or ongoing work done in the community to enable indirect call target profiling support or not. Please inform if cfe-dev is a better candidate for posting PGO related emails. I'll be interested in seeing your work. I'm interested in techniques for guarded devirtualization, but the profiling infrastructure should be fairly common. If we could arrange the instrumentation in such a way to enable both use cases, we could share infrastructure.

Philip

Thanks, -Betul Buyukkurt Employee of the Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project

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