[Bug 96743] [BYT, HSW, SKL, BXT, KBL] GPU hangs with GfxBench 4.0 CarChase

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96743

--- Comment #41 from Topi Pohjolainen <topi.pohjolainen at intel.com> ---
(In reply to Topi Pohjolainen from comment #21)
> Okay, disabling these two optimizations gives the gpu hangs on HSW even on
> top of current upstream:
> 
> diff --git a/src/intel/compiler/brw_nir.c b/src/intel/compiler/brw_nir.c
> index f863085..5d83ce3 100644
> --- a/src/intel/compiler/brw_nir.c
> +++ b/src/intel/compiler/brw_nir.c
> @@ -470,7 +470,6 @@ nir_optimize(nir_shader *nir, const struct brw_compiler
> *compiler,
>     do {
>        progress = false;
>        OPT_V(nir_lower_vars_to_ssa);
> -      OPT(nir_opt_copy_prop_vars);
>  
>        if (is_scalar) {
>           OPT(nir_lower_alu_to_scalar);
> @@ -498,9 +497,6 @@ nir_optimize(nir_shader *nir, const struct brw_compiler
> *compiler,
>           OPT(nir_opt_dce);
>        }
>        OPT(nir_opt_if);
> -      if (nir->options->max_unroll_iterations != 0) {
> -         OPT(nir_opt_loop_unroll, indirect_mask);
> -      }
>        OPT(nir_opt_remove_phis);
>        OPT(nir_opt_undef);
>        OPT_V(nir_lower_doubles, nir_lower_drcp |

Using this on top of current upstream gave me a hang also on IVB already on 3rd
try. This allows me to debug locally on my laptop.

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