[Intel-gfx] piglit regression on sandybridge

[Zhenyu Wang]

Eric,

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

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..

thanks.

-- 
Open Source Technology Center, Intel ltd.

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