[Bug 86811] New: [BDW Bisected]Piglit spec_arb_shading_language_packing_execution_built-in-functions_vs-unpackSnorm4x8 fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86811

            Bug ID: 86811
           Summary: [BDW Bisected]Piglit
                    spec_arb_shading_language_packing_execution_built-in-f
                    unctions_vs-unpackSnorm4x8 fails
           Product: Mesa
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: mattst88 at gmail.com
          Reporter: huax.lu at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org
                CC: idr at freedesktop.org

System Environment:
--------------------------
Platform: BDW
Libdrm:       
(master)libdrm-2.4.58-13-gfb4177046de19730a784c3c16e4b73aab0ec6e41
Mesa:        (master)91a827624c01d40613e97322632aaffe319540f1
Xserver:   
(master)xorg-server-1.16.99.901-17-gc52a2b1ebad56820af932dfbc871701a8b04fd9c
Xf86_video_intel:(master)2.99.916-154-g0f15b8b45bb6de10ce1926db303247a5bd3c1c08
Libva:        (master)c095cc6cf08523cd0dffcfe5ac4bce9122527f22
Libva_intel_driver:(master)edbb8cdada09cd116103e68f942b0889fd767391
Kernel:   (drm-intel-nightly)904b8529cd69f98b98d33b533a211003f99fb1cd

Bug detailed description:
-----------------------------
It fails on BDW with mesa master branch, works well on 10.4 branch.
spec_arb_shading_language_packing_execution_built-in-functions_vs-unpackUnorm4x8
also fails.

Bisect shows： 94a30bbd4fe5f3eda167819e307f736268fd33f6 is the first bad commit.
commit 94a30bbd4fe5f3eda167819e307f736268fd33f6
Author:     Matt Turner <mattst88 at gmail.com>
AuthorDate: Sun Mar 9 20:22:23 2014 -0700
Commit:     Matt Turner <mattst88 at gmail.com>
CommitDate: Tue Nov 25 17:29:02 2014 -0800

    i965/vec4: Optimize unpackSnorm4x8().

    Reduces the number of instructions needed to implement unpackSnorm4x8()
    from 16 -> 6.

    Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

output:
Probe color at (0,0)
  Expected: 0.000000 1.000000 0.000000 1.000000
  Observed: 1.000000 0.000000 0.000000 1.000000
PIGLIT: {"result": "fail" }

Reproduce steps:
---------------------------- 
1. xinit
2. ./bin/shader_runner
generated_tests/spec/arb_shading_language_packing/execution/built-in-functions/vs-unpackSnorm4x8.shader_test
-auto

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