[Bug 87887] New: [i965 Bisected]ES2-CTS.gtf.GL.cos.cos_float_vert_xvary fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87887

            Bug ID: 87887
           Summary: [i965 Bisected]ES2-CTS.gtf.GL.cos.cos_float_vert_xvary
                    fails
           Product: Mesa
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: high
         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: IVB
Libdrm:       
(master)libdrm-2.4.58-19-gf99522e678dbbaffeca9462a8edcbe900574dc12
Mesa:        (master)64dcb2bb0a64258b895222fcf89da35bb8aa4338
Xserver:(master)xorg-server-1.16.99.901-102-g826e7c2b36f192fbbe7ddff37eb559f4d6301146
Xf86_video_intel:(master)2.99.917-1-g0d42b0ed25d4112e0b3e3218e5c42947bbeb9e27
Libva:        (master)e97ac9e78cd475a13e722c455e34d5d39d0f059d
Libva_intel_driver:(master)43bd81abdde40b50ac71f6f44eb04e4eaf5af5f6
Kernel:   (drm-intel-nightly)74e2b20ddb3898757ecc64534d6f3c3141ef5a31

Bug detailed description:
---------------------------
It fails on i965 with mesa master branch, works well on 10.4 branch.
Following cases also fail with the same bisect commit:
ES2-CTS.gtf.GL.mix.mix_float_vert_xvary_yconsthalf_aconsthalf
ES2-CTS.gtf.GL.mix.mix_vec2_vert_xvary_yconsthalf_aconsthalf
ES2-CTS.gtf.GL.sin.sin_float_vert_xvary
Bisect shows: 44573458bdc52acc304fb75d6df502312b8e149c is the first bad commit
commit 44573458bdc52acc304fb75d6df502312b8e149c
Author:     Matt Turner <mattst88 at gmail.com>
AuthorDate: Sat Dec 20 11:50:31 2014 -0800
Commit:     Matt Turner <mattst88 at gmail.com>
CommitDate: Mon Dec 29 10:08:18 2014 -0800

    i965/vec4: Add pass to gather constants into a vector-float MOV.

    Currently only handles consecutive instructions with the same
    destination that collectively write all channels.

    total instructions in shared programs: 5879798 -> 5869011 (-0.18%)
    instructions in affected programs:     465236 -> 454449 (-2.32%)

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

output:
dEQP Core GL-CTS-2.0 (0x0052484b) starting..
  target implementation = 'X11'

Test case 'ES2-CTS.gtf.GL.cos.cos_float_vert_xvary'..
#+ GTF/GL/cos/cos_float_vert_xvary.shader1.ppm and
GTF/GL/cos/cos_float_vert_xvary.shader2.ppm are different
  Fail (Fail)

DONE!

Test run totals:
  Passed:        0/1 (0.00%)
  Failed:        1/1 (100.00%)
  Not supported: 0/1 (0.00%)
  Warnings:      0/1 (0.00%)

Reproduce steps:
-------------------------
1. xinit
2. ./glcts --deqp-case=ES2-CTS.gtf.GL.cos.cos_float_vert_xvary

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