[Bug 89944] GPU crash in Civilization 5

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89944

Sami Liedes <sami.liedes at iki.fi> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kenneth at whitecape.org

--- Comment #3 from Sami Liedes <sami.liedes at iki.fi> ---
I bisected this down to this commit:

------------------------------------------------------------
commit 30f51f1a1a70bc838d5bed449daff0dd9f2e8ef2
Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Wed Oct 22 20:48:21 2014 -0700

    glsl: Optimize "if (cond) discard;" to a conditional discard.               

    st_glsl_to_tgsi and ir_to_mesa have handled conditional discards for a      
    long time; the previous patch added that capability to i965.                

    i965 (Haswell) shader-db stats:                                             

    Without NIR:                                                                
    total instructions in shared programs: 5792133 -> 5776360 (-0.27%)          
    instructions in affected programs:     737585 -> 721812 (-2.14%)            
    helped:                                6300                                 
    HURT:                                  68                                   
    GAINED:                                2                                    

    With NIR:                                                                   
    total instructions in shared programs: 5787538 -> 5769569 (-0.31%)          
    instructions in affected programs:     767843 -> 749874 (-2.34%)
    helped:                                6522
    HURT:                                  35
    GAINED:                                6

    Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
    Reviewed-by: Connor Abbott <cwabbott0 at gmail.com>
    Reviewed-by: Matt Turner <mattst88 at gmail.com>
    Reviewed-by: Eric Anholt <eric at anholt.net>
------------------------------------------------------------

I can also confirm that reverting that commit on top of recent HEAD (4deca127)
fixes the issue.

I can attach R600_DEBUG=ps,gs,vs output from the offending commit and its
parent if you think comparing them is of any use.

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