[Bug 78692] New: Football Manager 2014, gameplay rendered black & white

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78692

          Priority: medium
            Bug ID: 78692
          Assignee: idr at freedesktop.org
           Summary: Football Manager 2014, gameplay rendered black & white
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: lemody at gmail.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Drivers/DRI/i965
           Product: Mesa

Football Manager 2014 gameplay rendering displays in black and white, missing
colors (Mesa git master). This is a regression.

I've bisected the regression in the following commit:

--- 8< ---
commit f770123f58b46459e8dbd27525162ee8ba89f30b
Author: Matt Turner <mattst88 at gmail.com>
Date:   Tue Apr 15 22:46:55 2014 -0700

    i965/fs: Reduce restrictions on interference in register coalescing.

    We previously only allowed coalescing registers that interfere (i.e.,
    whose live ranges overlap) if the destination register's live range was
    entirely inside the source's live range. This is unnecessary -- we only
    need to check for interfering writes in the intersection of their live
    ranges.

    total instructions in shared programs: 1639470 -> 1638453 (-0.06%)
    instructions in affected programs:     84751 -> 83734 (-1.20%)

    Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

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