[Mesa-dev] [PATCH 1/2] nir: optimize min(min(a, b), c) to min3(a, b, c) under an option
Samuel Pitoiset
samuel.pitoiset at gmail.com
Fri Jun 1 08:08:31 UTC 2018
On 06/01/2018 02:17 AM, Ian Romanick wrote:
> On 05/30/2018 10:06 AM, Samuel Pitoiset wrote:
>> Similar for max().
>>
>> Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
>> ---
>> src/compiler/nir/nir.h | 3 +++
>> src/compiler/nir/nir_opt_algebraic.py | 8 ++++++++
>> 2 files changed, 11 insertions(+)
>>
>> diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
>> index f6086bd6c0..04991b7d04 100644
>> --- a/src/compiler/nir/nir.h
>> +++ b/src/compiler/nir/nir.h
>> @@ -1897,6 +1897,9 @@ typedef struct nir_shader_compiler_options {
>> /* lower b2f to iand */
>> bool lower_b2f;
>>
>> + /* lower min(min(a, b), c) to min3(a, b, c) (same for max()). */
>> + bool lower_minmax3;
>
> The way this variable is named and the way it is used is confusing.
> Every other lower_foo means "convert foo to something else." This one
> means "make some foo."
Yes, the name is not that good. Any suggestions?
>
>> +
>> /* Does the native fdot instruction replicate its result for four
>> * components? If so, then opt_algebraic_late will turn all fdotN
>> * instructions into fdot_replicatedN instructions.
>> diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
>> index 909ea3daf4..1d67e2d88c 100644
>> --- a/src/compiler/nir/nir_opt_algebraic.py
>> +++ b/src/compiler/nir/nir_opt_algebraic.py
>> @@ -224,6 +224,14 @@ optimizations = [
>> (('imax', a, a), a),
>> (('umin', a, a), a),
>> (('umax', a, a), a),
>> +
>> + (('fmin', ('fmin', a, b), c), ('fmin3', a, b, c), 'options->lower_minmax3'),
>> + (('imin', ('imin', a, b), c), ('imin3', a, b, c), 'options->lower_minmax3'),
>> + (('umin', ('umin', a, b), c), ('umin3', a, b, c), 'options->lower_minmax3'),
>> + (('fmax', ('fmax', a, b), c), ('fmax3', a, b, c), 'options->lower_minmax3'),
>> + (('imax', ('imax', a, b), c), ('imax3', a, b, c), 'options->lower_minmax3'),
>> + (('umax', ('umax', a, b), c), ('umax3', a, b, c), 'options->lower_minmax3'),
>> +
>> (('fmin', a, ('fneg', a)), ('fneg', ('fabs', a))),
>> (('imin', a, ('ineg', a)), ('ineg', ('iabs', a))),
>> (('fmin', a, ('fneg', ('fabs', a))), ('fneg', ('fabs', a))),
>>
>
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