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From: "hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/98173] New: -fno-tree-pta improves tfft2 benchmark
 by 50% on zen and -march=natie.
Date: Mon, 07 Dec 2020 13:14:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98173

            Bug ID: 98173
           Summary: -fno-tree-pta improves tfft2 benchmark by 50% on zen
                    and -march=3Dnatie.
           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.=20=20
There is significant regression on tfft2 (and some with tramp3d) with
-march=3Dnative on zen.

https://lnt.opensuse.org/db_default/v4/CPP/latest_runs_report?younger_in_da=
ys=3D14&older_in_days=3D0&min_percentage_change=3D0.02&revisions=3D03f48fb0=
d37c769661d30aa0f08d91bb7174cd98%2C68ee6d12fe9882223f47f81f93616577ab4e36da=
&include_user_branches=3Don

https://lnt.opensuse.org/db_default/v4/SPEC/latest_runs_report?younger_in_d=
ays=3D14&older_in_days=3D0&min_percentage_change=3D0.02&revisions=3D03f48fb=
0d37c769661d30aa0f08d91bb7174cd98%2C68ee6d12fe9882223f47f81f93616577ab4e36d=
a&include_user_branches=3Don=