[Bug 90547] New: [BDW/BSW/SKL Bisected]Piglit/glean at vertprog1-rsq_test_2_(reciprocal_square_root_of_negative_value) fais

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90547

            Bug ID: 90547
           Summary: [BDW/BSW/SKL
                    Bisected]Piglit/glean at vertprog1-rsq_test_2_(reciprocal
                    _square_root_of_negative_value) fais
           Product: Mesa
           Version: git
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: high
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 115938
  --> https://bugs.freedesktop.org/attachment.cgi?id=115938&action=edit
output

System Environment:
--------------------------
Platform: BSW
Libdrm:       
(master)libdrm-2.4.61-1-ge9ea1f42d14e10852f292f3470aee260c7349978
Mesa:        (master)4ee69a97bb0af0cc216539c48b246ea2abf8f208
Xserver:   
(master)xorg-server-1.17.0-146-gfc59c8fe8d941b0ec1e98c59bc57b1f97dba149d
Xf86_video_intel:(master)2.99.917-310-ge617c1941c4e5ee90b69221013aab799eace925d 
Libva:        (master)9bfde38f19d81b7f33db8c4c8e80420c9e60429e
Libva_intel_driver:(master)8dda0650b55c467200c34ada127b5d9b54edea5c
Kernel:   (drm-intel-nightly)7e30ba951445ac86f6235a6cf55fc84730c1baf3

Bug detailed description:
-----------------------------
It fails on BDW/BSW/SKL with mesa master branch, it works well on 10.5 branch.

Bisect shows: 42298b05d1ebd8b17b89411723ae13295643e496 is the first bad commit
commit 42298b05d1ebd8b17b89411723ae13295643e496
Author:     Jason Ekstrand <jason.ekstrand at intel.com>
AuthorDate: Thu May 7 15:07:49 2015 -0700
Commit:     Jason Ekstrand <jason.ekstrand at intel.com>
CommitDate: Mon May 18 15:32:00 2015 -0700

    i965: Use NIR by default for vertex shaders on GEN8+

    GLSL IR vs. NIR shader-db results for SIMD8 vertex shaders on Broadwell:

       total instructions in shared programs: 2742062 -> 2681339 (-2.21%)
       instructions in affected programs:     1514770 -> 1454047 (-4.01%)
       helped:                                5813
       HURT:                                  1120

    The gained programs are ARB vertext programs that were previously going
    through the vec4 backend.  Now that we have prog_to_nir, ARB vertex
    programs can go through the scalar backend so they show up as "gained" in
    the shader-db results.

    Acked-by: Kenneth Graunke <kenneth at whitecape.org>
    Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
    Acked-by: Matt Turner <mattst88 at gmail.com>


Reproduce steps:
---------------------------- 
1. xinit
2. PIGLIT_TEST='RSQ test 2 (reciprocal square root of negative value)'
bin/glean -o -v -v -v -t +vertProg1

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