[Bug 73954] New: [SNB Bisected]Ogles3conform GL3Tests_transform_feedback_transform_feedback_max_separate.test fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73954

          Priority: high
            Bug ID: 73954
                CC: idr at freedesktop.org
          Assignee: mattst88 at gmail.com
           Summary: [SNB Bisected]Ogles3conform
                    GL3Tests_transform_feedback_transform_feedback_max_sep
                    arate.test fails
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: Drivers/DRI/i965
           Product: Mesa

Created attachment 92633
  --> https://bugs.freedesktop.org/attachment.cgi?id=92633&action=edit
output

System Environment:
--------------------------
Platform: Sandybridge 
Libdrm:        (master)libdrm-2.4.52
Mesa:        (master)1032c33cb93f1e8839be0f743b81492c2ca87e39
Xserver:   
(master)xorg-server-1.15.0-1-ga92c6406e7f6c0b74fb1cb9361ad904facc0f722
Xf86_video_intel:(master)2.99.907-46-g2c441079cbd52902d356b652659e2be84726940e
Cairo:        (master)2a7f133639bed86a29dd9693cb78c0aa42eaff30
Libva:        (staging)79ddde6bab54618046f136471c020c08ff4fde50
Libva_intel_driver:(staging)6736a39fce442a8e5abb2a2e99adf56e3965d35f
Kernel:    (drm-intel-nightly) 164a4cb4c1431a0689f85507868356fae24da638

Bug detailed description:
-----------------------------
It fails on Sandybridge with mesa master branch. It doesn't happen on mesa 10.0
branch.

Following Webglc cases also fail with same bisect commit:
conformance/glsl/functions/glsl-function-step-float.html
conformance/glsl/functions/glsl-function-step-gentype.html

Bisect shows: 4bd6e0d7c69b304be88996a6c2b96ce7d996e627 is the first bad commit.
commit 4bd6e0d7c69b304be88996a6c2b96ce7d996e627
Author:     Matt Turner <mattst88 at gmail.com>
AuthorDate: Sat Dec 21 11:28:05 2013 -0800
Commit:     Matt Turner <mattst88 at gmail.com>
CommitDate: Tue Jan 21 14:20:44 2014 -0800

    glsl: Vectorize multiple scalar assignments

    Reduces vertex shader instruction counts in DOTA2 by 6.42%, L4D2 by
    4.61%, and CS:GO by 5.71%.

    total instructions in shared programs: 1500153 -> 1498191 (-0.13%)
    instructions in affected programs:     59919 -> 57957 (-3.27%)

    Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>

Reproduce steps:
----------------------------
1. xinit
2. ./GTF -width=64 -height=64
-run=GL3Tests/transform_feedback/transform_feedback_max_separate.test

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