[cfe-dev] Training files for building clang with PGO?

[Alex Wang via cfe-dev]

> On Mar 16, 2017, at 4:09 PM, Justin Bogner <mail at justinbogner.com> wrote:
> 
> Alex Wang via cfe-dev <cfe-dev at lists.llvm.org> writes:
>> Hi all! Quick question about building clang with PGO.
>> 
>> I've found the documentation on this process somewhat unclear. I get
>> that the source files used for training/profiling should go into
>> <clang-path>/utils/perf-training, but I don't understand from where I
>> am supposed to get those files. The single hello_world.cpp definitely
>> isn't enough for PGO to be useful.
>> 
>> Are the training files something that is to be added in the future? Or
>> am I supposed to copy the training files from somewhere else? And if
>> it's the latter, from where?
> 
> The idea is that you add representative inputs from workloads you care
> about there. These can and do differ between different vendors of clang,
> so it really depends on what you want your clang optimized for.

Ah, I see. I thought there would be a "generic" set of files to profile with
somewhere, but it looks like I was mistaken. Thank you!