[Intel-gfx] piglit regression on sandybridge

[Ian Romanick]

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On 11/29/2010 12:52 AM, Zhenyu Wang wrote:

> Looks the culprit for recent piglit regression on sandybridge
> that caused hang is bisected to

Could you be more specific about the regression?  The commit message
mentions two tests that regress with this change.  Are there other
regressions?  If yes, what are they?

> commit 9effc1adf1e7ba57fb3b10909762b76c1ae12f61
> Author: Eric Anholt <eric at anholt.net>
> Date:   Mon Oct 11 16:02:08 2010 -0700
> 
> i965: re-enable gen6 IF statements in the fragment shader.
> 
> IF statements were getting flattened while they were broken.  With
> Zhenyu's last fix for ENDIF's type, everything appears to have lined
> up to actually work.
> 
> This regresses two tests:
> glsl1-! (not) operator (1, fail)
> glsl1-! (not) operator (1, pass)
> 
> but fixes tests that couldn't work before because the IFs couldn't
> be flattened:
> glsl-fs-discard-01
> occlusion-query-discard
> 
> (and, naturally, this should be a performance improvement for apps
>  that actually use IF statements to avoid executing a bunch of code).
> 
> What may go wrong with this? QA is stalled on this to continue on
> running piglit..

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