[Bug 109517] [GEN9+] 14-24% perf drop in SynMark2 v7 CSDof

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109517

            Bug ID: 109517
           Summary: [GEN9+] 14-24% perf drop in SynMark2 v7 CSDof
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: eero.t.tamminen at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Mesa performance in SynMark2 v7 CSDof test dropped 24% on SKL GT4e and 14-20%
on other GEN9+ platforms.

Setup:
- Ubuntu 18.04
- Unity / compiz desktop
- Mesa from git
- X server and drm-tip kernel from git within last 1-2 months, with modifier
support enabled
- FullHD monitor

Test-case:
- synmark2 OglCSDof
  (configured to run in fullscreen FullHD resolution.)

Regression happened between following commits:
* 2019-01-28 17:50:08 41a0acd6a1: Switch imx to kmsro and remove the imx winsys
* 2019-01-30 17:49:45 f4eb746ef7: r600: add -Wstrict-overflow=0 to meson to
silence the warning

CSDof compute shaders register spill, so a change to register usage (e.g. SENDS
support which is GEN9+ specific) is likely cause for the perf regression.

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