[Bug 94354] R9285 Unigine Valley perf regression since radeonsi: use re-Z

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94354

            Bug ID: 94354
           Summary: R9285 Unigine Valley perf regression since radeonsi:
                    use re-Z
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: adf.lists at gmail.com
        QA Contact: dri-devel at lists.freedesktop.org

Haven't tested other apps/settings, but on R9285 Unigine Valley on highest
settings, 8x AA, 1920x1080 fullscreen is slower after 

d0f3b524cdb8489a6872ba3639a13813de221fc2

radeonsi: use re-Z
This can increase perf for shaders that kill pixels (kill, alpha-test,
alpha-to-coverage).

Before

FPS: 27.2
Score: 1139
Min FPS: 13.5
Max FPS: 52.0

After 

FPS: 22.6
Score: 946
Min FPS: 11.7
Max FPS: 47.1

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