[Bug 76617] New: [SNB/IVB/HSW/BYT/HSW Bisected]Ogles3conform/GL3Tests_shadow_shadow_execution_vert.test fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76617

          Priority: high
            Bug ID: 76617
                CC: idr at freedesktop.org
          Assignee: mattst88 at gmail.com
           Summary: [SNB/IVB/HSW/BYT/HSW
                    Bisected]Ogles3conform/GL3Tests_shadow_shadow_executio
                    n_vert.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 96396
  --> https://bugs.freedesktop.org/attachment.cgi?id=96396&action=edit
output

System Environment:
--------------------------
Platform: Haswell
Libdrm:       
(master)libdrm-2.4.52-10-g1cb5fc706cf5913d9dee33c939f65a23ecea17a5
Mesa:        (master)7683fce8781ef0169333c5ee1276392d058cfaa8
Xserver:   
(master)xorg-server-1.15.99.901-129-gbf087659f0fb747c471e26c5b287c35877818040
Xf86_video_intel:(master)2.99.911-3-g220accd828c5a0054ae9e3b491a434f7a6c750e0
Cairo:        (master)bb17403622e9ea474017e0039af8ee48b2b285db
Libva:        (staging)bf2e1773d4373619232c4c653b8cda19ea329441
Libva_intel_driver:(staging)b1319c7f7cb9d20179b20dac2308330bd0e51ffe
Kernel:    (drm-intel-nightly)84295583b8322f96a187c4fc5cca5dd7d511f57e

Bug detailed description:
-----------------------------
It fails on Sandybridge, Ivybridge, Haswell, Baytrail and broadwell with mesa
master branch.It doesn't happen on mesa 10.1 branch.

Bisect shows:9630ba6c6e754b438cf67c7d76ec1c99488df3ba is the first bad commit.
commit 9630ba6c6e754b438cf67c7d76ec1c99488df3ba
Author:     Matt Turner <mattst88 at gmail.com>
AuthorDate: Tue Mar 11 13:14:08 2014 -0700
Commit:     Matt Turner <mattst88 at gmail.com>
CommitDate: Mon Mar 24 11:06:26 2014 -0700

    i965/vec4: Let dead code eliminate trim dead channels.

    That is, modify

       mad dst, a, b, c

    to be

       mad dst.xyz, a, b, c

    if dst.w is never read.

    total instructions in shared programs: 811869 -> 805582 (-0.77%)
    instructions in affected programs:     168287 -> 162000 (-3.74%)

    Reviewed-by: Eric Anholt <eric at anholt.net>

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

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