[PATCH, RFC] Add a pass counter for "are we there yet" purposes

[Sandra Loosemore]

On 10/16/2017 12:53 AM, Richard Biener wrote:
> On October 16, 2017 7:38:50 AM GMT+02:00, Sandra Loosemore <sandra@codesourcery.com> wrote:
>> This patch is a first cut at solving the problem discussed in this
>> thread
>>
>> https://gcc.gnu.org/ml/gcc/2017-10/msg00016.html
>>
>> where I have some nios2 backend patches in my queue that need a way of
>> knowing whether the split1 pass has run yet.  There seemed to be
>> agreement that a general way to query the pass manager for this
>> information would be useful.
>>
>> [snip]
>
> I missed the post of why you need to know this. But as you noticed we're using reload_completed for similar purpose. There's also the possibility of setting/adding a pass property that split could provide and which you could query. We're using this to signal the various different lowering stages in GIMPLE for example.

See the thread linked above.  There was interest in a general mechanism 
to query the pass manager state instead of adding the bookkeeping to the 
nios2 backend or adding something to track the split1 pass to the 
target-independent parts of the compiler.  After fiddling with it, 
though, I'm not sure this is an improvement.

Maybe it would help the discussion if I got my nios2 patch set posted so 
that everybody could see the actual use case?  It'll take me a few days 
to finish cleaning it up.

-Sandra