PR126964 Middle-end improvement

[Tobias Burnus]

Hi Jerry!

To make it easier for others reading this email:

This is abouthttps://gcc.gnu.org/PR126964:
[17 Regression] 4-5% slowdown of tonto of Zen{2,3,4,5} since r17-3342-gf3943597388db4

and

Jerry D wrote:

> In the subject PR Comment #10, there is a patch attached that is 
> recommended by Claude to give further performance improvement.

And while Jerry linked to the attachment of comment 10 - the latest
update is in Comment 17,
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126964#c17

Both patches affect gcc/gimple-loop-versioning.cc

* * *

> It is not within the bounds of commits I can do and I can only test 
> with made-up tests for the spec tonto case. (I do not have access to 
> SPEC)
>
> I am going to leave it alone. However, someone might be interested in 
> looking at it and maybe even using it. 

It is also out of the realm of my expertise, which is Fortran and
OpenMP (+ OpenACC / offload) related.

[However, we have a recent SPEC CPU, if there is something that makes
sense to test. But others closer related to those topics like some
SUSE developers have as well. (We also have SPEC Accel and SPEC HPC,
if I should test something with those.)]

Cheers,

Tobias