[Bug gcov-profile/120614] New: 525.x264_r is ~30% slower with AutoFDO

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120614

            Bug ID: 120614
           Summary: 525.x264_r is ~30% slower with AutoFDO
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: gcov-profile
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kugan at gcc dot gnu.org
  Target Milestone: ---

525.x264_r is ~30% slower with AutoFDO compared to PGO.

Functions that contribute most to the regressions are:

x264_pixel_sad_x4_16x16.lto_priv.0
x264_pixel_sad_x4_8x8.lto_priv.0

I used -O3 -flto -mcpu=neoverse-v2 equivalent on current master.