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Re: Basic Block Statistics

On Tue, May 16, 2017 at 2:45 PM, David Malcolm <> wrote:
> 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

Very helpful, thank you Mr. Malcolm!


> Dave

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