[Bug 82932] New: [SNB+ Bisected]Ogles3conform ES3-CTS.shaders.indexing.vector_subscript.vec3_static_loop_subscript_write_direct_read_vertex fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82932

          Priority: high
            Bug ID: 82932
                CC: idr at freedesktop.org
          Assignee: mattst88 at gmail.com
           Summary: [SNB+ Bisected]Ogles3conform
                    ES3-CTS.shaders.indexing.vector_subscript.vec3_static_
                    loop_subscript_write_direct_read_vertex fails
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: Drivers/DRI/i965
           Product: Mesa

System Environment:
--------------------------
Platform: BYT
Libdrm:       
(master)libdrm-2.4.56-8-gd9ce09de12131fa8c5ff2d7c2dbd6b61d8a5fd14
Mesa:        (master)d682ebec0bb8716dfa7747c46d5bfad732ead06c
Xserver:(master)xorg-server-1.15.99.902-121-g2f5cf9ff9a0f713b7e038636484c77f113a5f10a
Xf86_video_intel:(master)2.99.914-60-gf5469681b620d9d6ccaf53e92ed31f931cb03b0d
Libva:        (master)acfcd5f0637a951d50c5112c7dfbd46f1d0dcdb3
Libva_intel_driver:(master)f3f49f2f0e6b3669d9b09341a11cf0b96e138674
Kernel:   (drm-intel-nightly)49ceddc7b3b0e3f7eb21b9fb4c9b840cff630047

Bug detailed description:
---------------------------
It fails on SNB+ platforms with mesa master branch, works well on Mesa 10.2
branch.
ES3-CTS.shaders.indexing.vector_subscript.vec4_static_loop_subscript_write_direct_read_vertex
also fails with same bisect commit.

Bisect shows:04895f5c601b240df547739da786b7c2b65bdd1e is the first bad commit.
commit 04895f5c601b240df547739da786b7c2b65bdd1e
Author:     Matt Turner <mattst88 at gmail.com>
AuthorDate: Fri Aug 15 12:32:23 2014 -0700
Commit:     Matt Turner <mattst88 at gmail.com>
CommitDate: Wed Aug 20 13:01:18 2014 -0700

    i965/vec4: Allow reswizzling writemasks when swizzle is single-valued.

    total instructions in shared programs: 4288033 -> 4266151 (-0.51%)
    instructions in affected programs:     930915 -> 909033 (-2.35%)


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

Test case
'ES3-CTS.shaders.indexing.vector_subscript.vec3_static_loop_subscript_write_direct_read_vertex'..
Vertex compile time = 9.737000 ms
Fragment compile time = 0.557000 ms
Link time = 2.031000 ms
  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=ES3-CTS.shaders.indexing.vector_subscript.vec3_static_loop_subscript_write_direct_read_vertex

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