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Re: Basic Block Statistics

On Tue, 2017-05-16 at 14:24 -0400, Will Hawkins wrote:
> Hello everyone!
> I apologize if this is not the right venue to ask this question
> and/or
> this is a waste of your time.
> I was just wondering if there are statistics that gcc can emit that
> includes either a) the average number of instructions per basic block
> and/or b) the average size (in bytes) per basic block in a
> compilation
> unit.
> If nothing like this exists, I am more than happy to code something
> up
> if people besides me think that it might be interesting.
> I promise that I googled for information before asking, but I can't
> guarantee that I didn't miss anything. Again, I apologize if I just
> needed to RTFM better.
> Thanks in advance for any responses!
> Will

I don't think anything like this currently exists, but it's probably
doable via a plugin, e.g. by hooking up a new RTL pass somewhere
towards the end of the pass pipeline.

That said, IIRC basic blocks aren't used in the final passes;
presumably they're not meaningful after the "free_cfg" pass.

Hope this is helpful

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