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Commit 8d822246 authored by Faith Ekstrand's avatar Faith Ekstrand :speech_balloon:
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intel/nir: Enable nir_opt_find_array_copies


We have to be a bit careful with this one because we want it to run in
the optimization loop but only in the first brw_nir_optimize call.
Later calls assume that we've lowered away copy_deref instructions and
we don't want to introduce any more.

Shader-db results on Kaby Lake:

    total instructions in shared programs: 15176942 -> 15176942 (0.00%)
    instructions in affected programs: 0 -> 0
    helped: 0
    HURT: 0

In spite of the lack of any shader-db improvement, this patch completely
eliminates spilling in the Batman: Arkham City tessellation shaders.
This is because we are now able to detect that the temporary array
created by DXVK for storing TCS inputs is a copy of the input arrays and
use indirect URB reads instead of making a copy of 4.5 KiB of input data
and then indirecting on it with if-ladders.

Reviewed-by: default avatarCaio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
parent 53072582
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