Selective scheduling and its usage

[Martin Liška]

On 03/21/2018 11:17 AM, Andrey Belevantsev wrote:
> Hi Martin,
> 
> On 21.03.2018 12:48, Martin Liška wrote:
>> Hello.
>>
>> I noticed there are quite many selective scheduling PRs:
>> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84872
>> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84842
>> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84659
>>
>> and many others.
>>
>> I want to ask you if you plan to maintain the scheduling?
> 
> Yes.  The current status is that I have patches for 83530, 83962, 83913,
> 83480, 83972, 80463.  I don't have patches for any of the 84* issues.
> I'm planning to submit the patches for the former set and to look at the
> later set next week.

Nice!

Maybe we can create a meta bug to track all sel. scheduling issue.
May I create it?

> 
> I usually do most of the work by myself after internal discussions with
> Alexander and other colleagues here, and there might be delays when I get
> busy with unrelated stuff.  However, if there's a pressing need, we have
> enough knowledgeable people to fix any sel-sched PR within a week or so.
> 
>> Is it enabled by default for any target we support?
> 
> Yes, ia64 at -O3.  The testing we make usually is like follows: bootstrap
> and test on ia64, bootstrap with sel-sched enabled on x86-64, and make any
> new tests from PRs be run on x86-64, ia64, and ppc.  This way I'm confident
> that it mostly works on that platforms.

Great.

> 
>> Should we deprecate it for GCC 8?
> 
> No, I don't think so.

Works for me.

Thanks for clarification.
Martin

> 
> Best,
> Andrey
> 
>>
>> Thank you,
>> Martin
>