[Bug 88247] New: Commit 4457345 causes 2 DrawElements test regressions

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88247

            Bug ID: 88247
           Summary: Commit 4457345 causes 2 DrawElements test regressions
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: michael.w.mason at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Environment:
Mesa: (master 934e41c0b31cffa4efc08f61cff2389e3149b3f3)
Ubuntu 14.04

Commit 4457345 "i965/vec4: Add pass to gather constants into a vector-float
MOV" caused regressions in the following 2 DrawElements tests:

dEQP-GLES3.functional.shaders.texture_functions.texturegradoffset.sampler2dshadow_vertex
dEQP-GLES3.functional.shaders.texture_functions.texturegradoffset.sampler2darrayshadow_vertex


Analysis:

Bisect shows 44573458bdc52acc304fb75d6df502312b8e149c is the first bad commit.

Author: Matt Turner <mattst88 at gmail.com>
Date:   Sat Dec 20 11:50:31 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>


Steps to reproduce:

# ./deqp-gles3
--deqp-case=dEQP-GLES3.functional.shaders.texture_functions.texturegradoffset.sampler2dshadow_vertex
# ./deqp-gles3
--deqp-case=dEQP-GLES3.functional.shaders.texture_functions.texturegradoffset.sampler2darrayshadow_vertex

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