[Bug 109505] [GEN9+] 2% perf drop in Unigine Heaven, 1% in Valley

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109505

            Bug ID: 109505
           Summary: [GEN9+] 2% perf drop in Unigine Heaven, 1% in Valley
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                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

Setup:
* Ubuntu 18.04
* Unity / compiz desktop
* X server git version with modifiers enabled
* drm-tip kernel v4.19 or v4.20
* Mesa git version

Between following Mesa commits:
* 2018-12-13 17:49:48 9ebc00f32e: i965: Enable nir_opt_idiv_const for 32 and
64-bit integers
* 2018-12-14 17:40:27 5c454661c6: i965/gen9: Add workarounds for object
preemption

Unigine Heaven 4.0 and Valley 1.0 performance regressed.

On SKL GT4e, perf drop is:
- 2% in Heaven (high quality, tessellation enabled, no MSAA, fullscreen)
- 1% in Valley

On slower machines, drop is somewhat smaller.  Drop is GEN9+ specific, or at
least it's not visible on older platforms.  There may be some minuscule
regression also in heavier GfxBench tests, but it's too smaller to say for
sure.

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