[Bug 89944] GPU crash in Civilization 5

[bugzilla-daemon at freedesktop.org]

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

--- Comment #5 from Tom Stellard <tstellar at gmail.com> ---
(In reply to Sami Liedes from comment #3)
> 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

That would be useful.

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