thr3ads.net - Nouveau - [Nouveau] [PATCH v2] nv50/ir: Handle OP_CVT when folding constant expressions [Jan 2015]

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Tobias Klausmann

2015-Jan-11 19:56 UTC

[Nouveau] [PATCH v2] nv50/ir: Handle OP_CVT when folding constant expressions

On 11.01.2015 20:19, Ilia Mirkin wrote:> On Sun, Jan 11, 2015 at 12:27 PM, Tobias Klausmann
> <tobias.johannes.klausmann at mni.thm.de> wrote:
>>
>> On 11.01.2015 01:58, Ilia Mirkin wrote:
>>> On Fri, Jan 9, 2015 at 8:24 PM, Tobias Klausmann
>>> <tobias.johannes.klausmann at mni.thm.de> wrote:
>>>> Folding for conversions: F32->(U{16/32}, S{16/32}) and
(U{16/32},
>>>> {S16/32})->F32
>>>>
>>>> Signed-off-by: Tobias Klausmann <tobias.johannes.klausmann
at mni.thm.de>
>>>> ---
>>>> V2: beat me, whip me, split out F64
>>>>
>>>>    .../drivers/nouveau/codegen/nv50_ir_peephole.cpp   | 81
>>>> ++++++++++++++++++++++
>>>>    1 file changed, 81 insertions(+)
>>>>
>>>> diff --git
a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
>>>> b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
>>>> index 9a0bb60..741c74f 100644
>>>> --- a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
>>>> +++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
>>>> @@ -997,6 +997,87 @@ ConstantFolding::opnd(Instruction *i,
ImmediateValue
>>>> &imm0, int s)
>>>>          i->op = OP_MOV;
>>>>          break;
>>>>       }
>>>> +   case OP_CVT: {
>>>> +      Storage res;
>>>> +      bld.setPosition(i, true); /* make sure bld is
init'ed */
>>>> +      switch(i->dType) {
>>>> +      case TYPE_U16:
>>>> +         switch (i->sType) {
>>>> +         case TYPE_F32:
>>>> +            if (i->saturate)
>>>> +               res.data.u16 =
util_iround(CLAMP(imm0.reg.data.f32, 0,
>>>> +                                                UINT16_MAX));
>>> Where did this saturate stuff come from? It doesn't make sense
to
>>> saturate to a non-float dtype. I'd go ahead and just
>>> assert(!i->saturate) in the int dtype cases.
>>>
>>> One does wonder what the hw does if the float doesn't fit in
the
>>> destination... whether it saturates or not. I don't hugely care
>>> though.
>> Actually i can't remember why that was added in the first place,
i'll go
>> ahead and follow your advice here.
> Oh wait... this was to support saturating an array access into a u16...
>
>           const int sat = (i->op == OP_TXF) ? 1 : 0;
>           DataType sTy = (i->op == OP_TXF) ? TYPE_U32 : TYPE_F32;
>           bld.mkCvt(OP_CVT, TYPE_U16, layer, sTy, src)->saturate = sat;
>
> So... basically if the source is a U32 and the dest is a U16, we want
> to saturate there? IMO this is such a minor use-case that it doesn't
> really matter. However I guess you can keep the saturate bits around
> if you like.We can do it with or without the saturate if we rely on the test, 
assert(!i->saturate)'ing is the only thing that breaks the test you sure 
meant:

glsl-resource-not-bound 1DArray
glsl-resource-not-bound 2DArray
glsl-resource-not-bound 2DMSArray
>
>    -ilia

Ilia Mirkin

2015-Jan-11 19:57 UTC

head link

[Nouveau] [PATCH v2] nv50/ir: Handle OP_CVT when folding constant expressions

On Sun, Jan 11, 2015 at 2:56 PM, Tobias Klausmann
<tobias.johannes.klausmann at mni.thm.de> wrote:>
>
> On 11.01.2015 20:19, Ilia Mirkin wrote:
>>
>> On Sun, Jan 11, 2015 at 12:27 PM, Tobias Klausmann
>> <tobias.johannes.klausmann at mni.thm.de> wrote:
>>>
>>>
>>> On 11.01.2015 01:58, Ilia Mirkin wrote:
>>>>
>>>> On Fri, Jan 9, 2015 at 8:24 PM, Tobias Klausmann
>>>> <tobias.johannes.klausmann at mni.thm.de> wrote:
>>>>>
>>>>> Folding for conversions: F32->(U{16/32}, S{16/32}) and
(U{16/32},
>>>>> {S16/32})->F32
>>>>>
>>>>> Signed-off-by: Tobias Klausmann
<tobias.johannes.klausmann at mni.thm.de>
>>>>> ---
>>>>> V2: beat me, whip me, split out F64
>>>>>
>>>>>    .../drivers/nouveau/codegen/nv50_ir_peephole.cpp   | 81
>>>>> ++++++++++++++++++++++
>>>>>    1 file changed, 81 insertions(+)
>>>>>
>>>>> diff --git
a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
>>>>> b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
>>>>> index 9a0bb60..741c74f 100644
>>>>> ---
a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
>>>>> +++
b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
>>>>> @@ -997,6 +997,87 @@ ConstantFolding::opnd(Instruction *i,
>>>>> ImmediateValue
>>>>> &imm0, int s)
>>>>>          i->op = OP_MOV;
>>>>>          break;
>>>>>       }
>>>>> +   case OP_CVT: {
>>>>> +      Storage res;
>>>>> +      bld.setPosition(i, true); /* make sure bld is
init'ed */
>>>>> +      switch(i->dType) {
>>>>> +      case TYPE_U16:
>>>>> +         switch (i->sType) {
>>>>> +         case TYPE_F32:
>>>>> +            if (i->saturate)
>>>>> +               res.data.u16 =
util_iround(CLAMP(imm0.reg.data.f32, 0,
>>>>> +                                               
UINT16_MAX));
>>>>
>>>> Where did this saturate stuff come from? It doesn't make
sense to
>>>> saturate to a non-float dtype. I'd go ahead and just
>>>> assert(!i->saturate) in the int dtype cases.
>>>>
>>>> One does wonder what the hw does if the float doesn't fit
in the
>>>> destination... whether it saturates or not. I don't hugely
care
>>>> though.
>>>
>>> Actually i can't remember why that was added in the first
place, i'll go
>>> ahead and follow your advice here.
>>
>> Oh wait... this was to support saturating an array access into a u16...
>>
>>           const int sat = (i->op == OP_TXF) ? 1 : 0;
>>           DataType sTy = (i->op == OP_TXF) ? TYPE_U32 : TYPE_F32;
>>           bld.mkCvt(OP_CVT, TYPE_U16, layer, sTy, src)->saturate =
sat;
>>
>> So... basically if the source is a U32 and the dest is a U16, we want
>> to saturate there? IMO this is such a minor use-case that it
doesn't
>> really matter. However I guess you can keep the saturate bits around
>> if you like.
>
> We can do it with or without the saturate if we rely on the test,
> assert(!i->saturate)'ing is the only thing that breaks the test you
sure
> meant:
>
> glsl-resource-not-bound 1DArray
> glsl-resource-not-bound 2DArray
> glsl-resource-not-bound 2DMSArray
Hm, those are the only times that a texelFetch is done in piglit with
a constant layer index, I guess.

Tobias Klausmann

2015-Jan-11 20:17 UTC

head link

[Nouveau] [PATCH v2] nv50/ir: Handle OP_CVT when folding constant expressions

On 11.01.2015 20:57, Ilia Mirkin wrote:> On Sun, Jan 11, 2015 at 2:56 PM, Tobias Klausmann
> <tobias.johannes.klausmann at mni.thm.de> wrote:
>>
>> On 11.01.2015 20:19, Ilia Mirkin wrote:
>>> On Sun, Jan 11, 2015 at 12:27 PM, Tobias Klausmann
>>> <tobias.johannes.klausmann at mni.thm.de> wrote:
>>>>
>>>> On 11.01.2015 01:58, Ilia Mirkin wrote:
>>>>> On Fri, Jan 9, 2015 at 8:24 PM, Tobias Klausmann
>>>>> <tobias.johannes.klausmann at mni.thm.de> wrote:
>>>>>> Folding for conversions: F32->(U{16/32}, S{16/32})
and (U{16/32},
>>>>>> {S16/32})->F32
>>>>>>
>>>>>> Signed-off-by: Tobias Klausmann
<tobias.johannes.klausmann at mni.thm.de>
>>>>>> ---
>>>>>> V2: beat me, whip me, split out F64
>>>>>>
>>>>>>     .../drivers/nouveau/codegen/nv50_ir_peephole.cpp  
| 81
>>>>>> ++++++++++++++++++++++
>>>>>>     1 file changed, 81 insertions(+)
>>>>>>
>>>>>> diff --git
a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
>>>>>>
b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
>>>>>> index 9a0bb60..741c74f 100644
>>>>>> ---
a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
>>>>>> +++
b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
>>>>>> @@ -997,6 +997,87 @@ ConstantFolding::opnd(Instruction
*i,
>>>>>> ImmediateValue
>>>>>> &imm0, int s)
>>>>>>           i->op = OP_MOV;
>>>>>>           break;
>>>>>>        }
>>>>>> +   case OP_CVT: {
>>>>>> +      Storage res;
>>>>>> +      bld.setPosition(i, true); /* make sure bld is
init'ed */
>>>>>> +      switch(i->dType) {
>>>>>> +      case TYPE_U16:
>>>>>> +         switch (i->sType) {
>>>>>> +         case TYPE_F32:
>>>>>> +            if (i->saturate)
>>>>>> +               res.data.u16 =
util_iround(CLAMP(imm0.reg.data.f32, 0,
>>>>>> +                                               
UINT16_MAX));
>>>>> Where did this saturate stuff come from? It doesn't
make sense to
>>>>> saturate to a non-float dtype. I'd go ahead and just
>>>>> assert(!i->saturate) in the int dtype cases.
>>>>>
>>>>> One does wonder what the hw does if the float doesn't
fit in the
>>>>> destination... whether it saturates or not. I don't
hugely care
>>>>> though.
>>>> Actually i can't remember why that was added in the first
place, i'll go
>>>> ahead and follow your advice here.
>>> Oh wait... this was to support saturating an array access into a
u16...
>>>
>>>            const int sat = (i->op == OP_TXF) ? 1 : 0;
>>>            DataType sTy = (i->op == OP_TXF) ? TYPE_U32 :
TYPE_F32;
>>>            bld.mkCvt(OP_CVT, TYPE_U16, layer, sTy,
src)->saturate = sat;
>>>
>>> So... basically if the source is a U32 and the dest is a U16, we
want
>>> to saturate there? IMO this is such a minor use-case that it
doesn't
>>> really matter. However I guess you can keep the saturate bits
around
>>> if you like.
>> We can do it with or without the saturate if we rely on the test,
>> assert(!i->saturate)'ing is the only thing that breaks the test
you sure
>> meant:
>>
>> glsl-resource-not-bound 1DArray
>> glsl-resource-not-bound 2DArray
>> glsl-resource-not-bound 2DMSArray
> Hm, those are the only times that a texelFetch is done in piglit with
> a constant layer index, I guess.Ok, i'll keep the saturates for (U/S)16 to for once satisfy the 
"dependency" you posted up there and to be future proof if somebody 
implements something similar(?) for the S16 one!

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