[Bug 89095] New: [SNB/IVB/BYT]Webglc conformance/glsl/functions/glsl-function-mix-float.html fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89095

            Bug ID: 89095
           Summary: [SNB/IVB/BYT]Webglc
                    conformance/glsl/functions/glsl-function-mix-float.htm
                    l 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: SNB
Libdrm:        
(master)libdrm-2.4.59-10-gde8532dd8359dfdaba839ff61fc9e2f05eaf57d3
Mesa:           (master)ea0f0eb6c0a8b20bcce50c63170df94892a51142
Xserver:       
(master)xorg-server-1.17.0-2-g20079c36cf7d377938ca5478447d8b9045cb7d43
Xf86_video_intel:
(master)2.99.917-111-g8ef3fdacac05ee93b685a93f6664696d026e889e
Libva:          (master)f9741725839ea144e9a6a1827f74503ee39946c3
Libva_intel_driver:   (master)9a20d6c34cb65e5b85dd16d6c8b3a215c5972b18
Kernel:  drm-intel-nightly/34f9b98d3e64c8df349816115ea5a560a6763ce8

ug detailed description:
---------------------------
It fails on SNB/IVB/BYT with mesa master branch, works well on 10.4 branch.
conformance/glsl/functions/glsl-function-mix-gentype.html also fails with the
same bisect commit.

Bisect shows: 3d581f99963dea7e93a2f8fd819410da02c1cb7f is the first bad commit
is the first bad commit.
commit 3d581f99963dea7e93a2f8fd819410da02c1cb7f
Author:     Matt Turner <mattst88 at gmail.com>
AuthorDate: Fri Dec 19 21:35:56 2014 -0800
Commit:     Matt Turner <mattst88 at gmail.com>
CommitDate: Tue Feb 10 17:47:37 2015 -0800

    i965/vec4: Emit MADs from (x + -(y * z)).

    Same as commit c4fab711 to the fs backend.

    total instructions in shared programs: 5945998 -> 5945788 (-0.00%)
    instructions in affected programs:     74665 -> 74455 (-0.28%)
    helped:                                399
    HURT:                                  180

    It hurts some programs because we make no attempts in the vec4 backend
    to avoid MADs if they have constant (or vector uniform) arguments.

    Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

Reproduce steps:
-------------------------
1. xinit
2. go to
https://www.khronos.org/registry/webgl/conformance-suites/1.0.2/webgl-conformance-tests.html
run conformance/glsl/functions/glsl-function-mix-float.html

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