[Bug 95370] [965GM] piglit fails many tests after a5d7e144

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95370

            Bug ID: 95370
           Summary: [965GM] piglit fails many tests after a5d7e144
           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: mark.a.janes at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Most of piglit fails pixel comparisons for 965GM at this commit.  Strangely, a
similar 965G system continues to pass all tests:

--------------------------------------------------------
a5d7e144eaf43fee37e6ff9e2de194407087632b
Author:     Connor Abbott <cwabbott0 at gmail.com>
AuthorDate: Mon Aug 3 17:44:08 2015 -0700

i965/fs: extend exec_size halving in the generator

The HW has a restriction that only vertical stride may cross register
boundaries. Previously, this only mattered for SIMD16 instructions where
we needed to use the same regioning parameters as the equivalent SIMD8
instruction but double the exec size. But we need to do the same
splitting for 64-bit instructions as well as instructions with a stride
of 2 (which effectively consume 64 bits per element). Fix up the code to
do the right thing instead of special-casing SIMD16.

Reviewed-by: Jordan Justen <jordan.l.justen at intel.com>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

--------------------------------------------------------

Sample test output:
/tmp/build_root/m64/lib/piglit/bin/shader_runner
/tmp/build_root/m64/lib/piglit/generated_tests/spec/glsl-1.10/execution/interpolation/interpolation-none-gl_FrontColor-smooth-none.shader_test
-auto
Probe color at (111,55)
  Expected: 0.666667 0.166667 0.166667 1.000000
  Observed: 1.000000 0.913726 0.000000 1.000000
Probe color at (159,45)
  Expected: 0.500000 0.166667 0.333333 1.000000
  Observed: 1.000000 1.000000 0.000000 1.000000
Probe color at (166,83)
  Expected: 0.333333 0.333333 0.333333 1.000000
  Observed: 0.584314 1.000000 0.000000 1.000000

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