[Bug middle-end/98173] New: -fno-tree-pta improves tfft2 benchmark by 50% on zen and -march=natie.

[hubicka at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98173

            Bug ID: 98173
           Summary: -fno-tree-pta improves tfft2 benchmark by 50% on zen
                    and -march=natie.
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hubicka at gcc dot gnu.org
  Target Milestone: ---

I got curious about overall effect of PTA.
This compares -fno-tree-pta to -ftree-pta.  
There is significant regression on tfft2 (and some with tramp3d) with
-march=native on zen.

https://lnt.opensuse.org/db_default/v4/CPP/latest_runs_report?younger_in_days=14&older_in_days=0&min_percentage_change=0.02&revisions=03f48fb0d37c769661d30aa0f08d91bb7174cd98%2C68ee6d12fe9882223f47f81f93616577ab4e36da&include_user_branches=on

https://lnt.opensuse.org/db_default/v4/SPEC/latest_runs_report?younger_in_days=14&older_in_days=0&min_percentage_change=0.02&revisions=03f48fb0d37c769661d30aa0f08d91bb7174cd98%2C68ee6d12fe9882223f47f81f93616577ab4e36da&include_user_branches=on