[Mesa-dev] [PATCH 3/5] i965/vec4-nir: Handle boolean resolvese on ILK-

[Matt Turner]

On Mon, Aug 3, 2015 at 5:22 PM, Jason Ekstrand <jason at jlekstrand.net> wrote:
> The analysis code was already there and running, we just weren't doing
> anything with the result of it yet.
> ---
>  src/mesa/drivers/dri/i965/brw_vec4_nir.cpp | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
>
> diff --git a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
> index b13465b..27f23d0 100644
> --- a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
> +++ b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
> @@ -1292,6 +1292,19 @@ vec4_visitor::nir_emit_alu(nir_alu_instr *instr)
>     default:
>        unreachable("Unimplemented ALU operation");
>     }
> +
> +   /* If we need to do a boolean resolve, replace the result with -(x & 1)
> +    * to sign extend the low bit to 0/~0
> +    */
> +   if (devinfo->gen <= 5 &&
> +       (instr->instr.pass_flags & BRW_NIR_BOOLEAN_MASK) == BRW_NIR_BOOLEAN_NEEDS_RESOLVE) {

Line wrap.

> +      dst_reg masked = dst_reg(this, glsl_type::int_type);
> +      masked.writemask = dst.writemask;
> +      emit(AND(masked, src_reg(dst), src_reg(1)));
> +      src_reg masked_neg = src_reg(masked);
> +      masked_neg.negate = true;
> +      emit(MOV(retype(dst, BRW_REGISTER_TYPE_D), masked_neg));
> +   }
>  }
>
>  void
> --
> 2.4.3
>
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