[Bug 111579] [regression][bisected] Piglit spec.arb_cull_distance.clip-cull-* test assertion

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111579

            Bug ID: 111579
           Summary: [regression][bisected] Piglit
                    spec.arb_cull_distance.clip-cull-* test assertion
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Keywords: bisected, regression
          Severity: not set
          Priority: not set
         Component: Drivers/Gallium/Iris
          Assignee: pendingchaos02+fdobugzilla at gmail.com
          Reporter: clayton.a.craft at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

The following tests fail with an assertion on all i965 and Iris platforms:
spec.arb_cull_distance.clip-cull-1
spec.arb_cull_distance.clip-cull-2
spec.arb_cull_distance.clip-cull-3
spec.arb_cull_distance.clip-cull-4

Output:
shader_runner: ../src/compiler/nir/nir_validate.c:1076: validate_var_decl:
Assertion `glsl_type_is_scalar(type)' failed.


Bisected to:

commit 300e758b7c428289909b318bb0df230b22ab5d9b
Author: Rhys Perry <pendingchaos02 at gmail.com>
Date:   Fri May 17 11:53:32 2019 +0100

    nir/lower_io_to_vector: allow FS outputs to be vectorized

    v2: handle dual-source blending
    v3: use a higher MAX_SLOTS

    Signed-off-by: Rhys Perry <pendingchaos02 at gmail.com>
    Reviewed-by: Connor Abbott <cwabbott0 at gmail.com>

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