Reviewed-by: Jason Ekstrand <ja...@jlekstrand.net>
On Tue, Apr 12, 2016 at 1:05 AM, Samuel Iglesias Gonsálvez <
sigles...@igalia.com> wrote:
> From: Iago Toral Quiroga <ito...@igalia.com>
>
> At least i965 hardware does not have native support for fract() on doubles.
> ---
> src/compiler/nir/nir.h | 1 +
> src/compiler/nir/nir_lower_double_ops.c | 14 ++++++++++++++
> 2 files changed, 15 insertions(+)
>
> diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
> index 7c9e498..4a57e74 100644
> --- a/src/compiler/nir/nir.h
> +++ b/src/compiler/nir/nir.h
> @@ -2289,6 +2289,7 @@ typedef enum {
> nir_lower_dtrunc = (1 << 3),
> nir_lower_dfloor = (1 << 4),
> nir_lower_dceil = (1 << 5),
> + nir_lower_dfract = (1 << 6)
> } nir_lower_doubles_options;
>
> void nir_lower_doubles(nir_shader *shader, nir_lower_doubles_options
> options);
> diff --git a/src/compiler/nir/nir_lower_double_ops.c
> b/src/compiler/nir/nir_lower_double_ops.c
> index 66e2be4..0f42c21 100644
> --- a/src/compiler/nir/nir_lower_double_ops.c
> +++ b/src/compiler/nir/nir_lower_double_ops.c
> @@ -417,6 +417,12 @@ lower_ceil(nir_builder *b, nir_ssa_def *src)
> src));
> }
>
> +static nir_ssa_def *
> +lower_fract(nir_builder *b, nir_ssa_def *src)
> +{
> + return nir_fsub(b, src, nir_ffloor(b, src));
> +}
> +
> static void
> lower_doubles_instr(nir_alu_instr *instr, nir_lower_doubles_options
> options)
> {
> @@ -455,6 +461,11 @@ lower_doubles_instr(nir_alu_instr *instr,
> nir_lower_doubles_options options)
> return;
> break;
>
> + case nir_op_ffract:
> + if (!(options & nir_lower_dfract))
> + return;
> + break;
> +
> default:
> return;
> }
> @@ -487,6 +498,9 @@ lower_doubles_instr(nir_alu_instr *instr,
> nir_lower_doubles_options options)
> case nir_op_fceil:
> result = lower_ceil(&bld, src);
> break;
> + case nir_op_ffract:
> + result = lower_fract(&bld, src);
> + break;
> default:
> unreachable("unhandled opcode");
> }
> --
> 2.5.0
>
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