[Bug 107510] [GEN8+] up to 10% perf drop on several 3D benchmarks

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107510

--- Comment #2 from Mark Janes <mark.a.janes at intel.com> ---
more precise bisection:

4434591bf56a6b0c193ef209ea9d7b9e3c95a522
Author:     Jason Ekstrand <jason at jlekstrand.net>
AuthorDate: Tue Jul 31 06:16:34 2018 -0700
Commit:     Jason Ekstrand <jason at jlekstrand.net>
CommitDate: Wed Aug 1 18:02:28 2018 -0700

Parent:     b0bb547f782 intel/nir: Split IO arrays into elements
Containing: master perf
Follows:    18.1-branchpoint (2138)
Precedes:   mesa-18.2.0-rc1 (15)

intel/nir: Call nir_lower_io_to_scalar_early

Shader-db results on Kaby Lake:

    total instructions in shared programs: 15166953 -> 15073611 (-0.62%)
    instructions in affected programs: 2390284 -> 2296942 (-3.91%)
    helped: 16469
    HURT: 505

    total loops in shared programs: 4954 -> 4951 (-0.06%)
    loops in affected programs: 3 -> 0
    helped: 3
    HURT: 0

Reviewed-by: Timothy Arceri <tarceri at itsqueeze.com>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

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