[Mesa-dev] [PATCH 1/3] nir: add fceil lowering

[Christian Gmeiner]

Am Mo., 12. Nov. 2018 um 19:17 Uhr schrieb Jonathan Marek <jonathan at marek.ca>:
>
> lowers ceil(x) as -floor(-x)
>
> Signed-off-by: Jonathan Marek <jonathan at marek.ca>

Reviewed-by: Christian Gmeiner <christian.gmeiner at gmail.com>

> ---
>  src/compiler/nir/nir.h                | 3 +++
>  src/compiler/nir/nir_opt_algebraic.py | 1 +
>  2 files changed, 4 insertions(+)
>
> diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
> index dc3c729dee..f9b32a5daf 100644
> --- a/src/compiler/nir/nir.h
> +++ b/src/compiler/nir/nir.h
> @@ -2086,6 +2086,9 @@ typedef struct nir_shader_compiler_options {
>     /** lowers ffract to fsub+ffloor: */
>     bool lower_ffract;
>
> +   /** lowers fceil to fneg+ffloor+fneg: */
> +   bool lower_fceil;
> +
>     bool lower_ldexp;
>
>     bool lower_pack_half_2x16;
> diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
> index 8b24daddfd..8f4df891b8 100644
> --- a/src/compiler/nir/nir_opt_algebraic.py
> +++ b/src/compiler/nir/nir_opt_algebraic.py
> @@ -124,6 +124,7 @@ optimizations = [
>     (('flrp at 32', a, b, c), ('fadd', ('fmul', c, ('fsub', b, a)), a), 'options->lower_flrp32'),
>     (('flrp at 64', a, b, c), ('fadd', ('fmul', c, ('fsub', b, a)), a), 'options->lower_flrp64'),
>     (('ffract', a), ('fsub', a, ('ffloor', a)), 'options->lower_ffract'),
> +   (('fceil', a), ('fneg', ('ffloor', ('fneg', a))), 'options->lower_fceil'),
>     (('~fadd', ('fmul', a, ('fadd', 1.0, ('fneg', ('b2f', c)))), ('fmul', b, ('b2f', c))), ('bcsel', c, b, a), 'options->lower_flrp32'),
>     (('~fadd at 32', ('fmul', a, ('fadd', 1.0, ('fneg',         c ))), ('fmul', b,         c )), ('flrp', a, b, c), '!options->lower_flrp32'),
>     (('~fadd at 64', ('fmul', a, ('fadd', 1.0, ('fneg',         c ))), ('fmul', b,         c )), ('flrp', a, b, c), '!options->lower_flrp64'),
> --
> 2.17.1
>
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-- 
greets
--
Christian Gmeiner, MSc

https://christian-gmeiner.info