[Mesa-dev] [PATCH 3/4] gallium: add PIPE_CAP_TGSI_DDIV capability
Ilia Mirkin
imirkin at alum.mit.edu
Mon Jan 16 17:14:54 UTC 2017
FWIW nouveau has an internal OP_DIV (which we lower to mul + rcp, but
probably shouldn't). It'd be trivial to hook up DDIV to come out as
OP_DIV in nv50_ir_from_tgsi.cpp. I suspect hacking something into
r600_asm should be moderately easy as well.
On Mon, Jan 16, 2017 at 12:08 PM, Roland Scheidegger <sroland at vmware.com> wrote:
> Is a cap bit actually needed here or can we require drivers to
> unconditionally support this (as long as they support doubles, of
> course...)?
> d3d11 has a requirement (if doubles are supported) that ddiv has an
> accuracy of 0.5 ULP - emulating with mul + rcp clearly isn't allowed
> (rcp, both the float and double variant, actually only has 1.0 ULP
> requirement, but it doesn't even matter).
> (Note that div, in contrast to ddiv, has explicitly allowed a*(1/b)
> implementation.)
>
> My guess is you'd actually never want this lowered. Noone uses doubles
> for ordinary graphics for a reason - I suspect when someone does use
> doubles he'd rather wants full accuracy...
>
> Roland
>
>
> Am 16.01.2017 um 17:20 schrieb Nicolai Hähnle:
>> From: Nicolai Hähnle <nicolai.haehnle at amd.com>
>>
>> For drivers to indicate that they don't want double-precision divides
>> to be lowered into rcp+mul.
>> ---
>> src/gallium/docs/source/screen.rst | 2 ++
>> src/gallium/drivers/freedreno/freedreno_screen.c | 3 ++-
>> src/gallium/drivers/i915/i915_screen.c | 1 +
>> src/gallium/drivers/ilo/ilo_screen.c | 1 +
>> src/gallium/drivers/llvmpipe/lp_screen.c | 1 +
>> src/gallium/drivers/nouveau/nv30/nv30_screen.c | 1 +
>> src/gallium/drivers/nouveau/nv50/nv50_screen.c | 1 +
>> src/gallium/drivers/nouveau/nvc0/nvc0_screen.c | 1 +
>> src/gallium/drivers/r300/r300_screen.c | 1 +
>> src/gallium/drivers/r600/r600_pipe.c | 3 ++-
>> src/gallium/drivers/radeonsi/si_pipe.c | 3 ++-
>> src/gallium/drivers/softpipe/sp_screen.c | 1 +
>> src/gallium/drivers/svga/svga_screen.c | 1 +
>> src/gallium/drivers/swr/swr_screen.cpp | 1 +
>> src/gallium/drivers/vc4/vc4_screen.c | 1 +
>> src/gallium/drivers/virgl/virgl_screen.c | 1 +
>> src/gallium/include/pipe/p_defines.h | 1 +
>> 17 files changed, 21 insertions(+), 3 deletions(-)
>>
>> diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst
>> index 000551a..4d79104 100644
>> --- a/src/gallium/docs/source/screen.rst
>> +++ b/src/gallium/docs/source/screen.rst
>> @@ -369,6 +369,8 @@ The integer capabilities:
>> * ``PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY``: Tell the GLSL compiler to use
>> the minimum amount of optimizations just to be able to do all the linking
>> and lowering.
>> +* ``PIPE_CAP_TGSI_DDIV``: Indicates that the TGSI DDIV instruction for double
>> + division is supported and preferred over a DRCP+DMUL sequence.
>>
>>
>> .. _pipe_capf:
>> diff --git a/src/gallium/drivers/freedreno/freedreno_screen.c b/src/gallium/drivers/freedreno/freedreno_screen.c
>> index 2ff89eb..d6fdb77 100644
>> --- a/src/gallium/drivers/freedreno/freedreno_screen.c
>> +++ b/src/gallium/drivers/freedreno/freedreno_screen.c
>> @@ -295,7 +295,8 @@ fd_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
>> case PIPE_CAP_VIEWPORT_SUBPIXEL_BITS:
>> case PIPE_CAP_TGSI_ARRAY_COMPONENTS:
>> case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
>> - case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
>> + case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
>> + case PIPE_CAP_TGSI_DDIV:
>> return 0;
>>
>> case PIPE_CAP_MAX_VIEWPORTS:
>> diff --git a/src/gallium/drivers/i915/i915_screen.c b/src/gallium/drivers/i915/i915_screen.c
>> index 18578c0..8791105 100644
>> --- a/src/gallium/drivers/i915/i915_screen.c
>> +++ b/src/gallium/drivers/i915/i915_screen.c
>> @@ -297,6 +297,7 @@ i915_get_param(struct pipe_screen *screen, enum pipe_cap cap)
>> case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
>> case PIPE_CAP_NATIVE_FENCE_FD:
>> case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
>> + case PIPE_CAP_TGSI_DDIV:
>> return 0;
>>
>> case PIPE_CAP_MAX_VIEWPORTS:
>> diff --git a/src/gallium/drivers/ilo/ilo_screen.c b/src/gallium/drivers/ilo/ilo_screen.c
>> index 20a0e8d..916c1c9 100644
>> --- a/src/gallium/drivers/ilo/ilo_screen.c
>> +++ b/src/gallium/drivers/ilo/ilo_screen.c
>> @@ -520,6 +520,7 @@ ilo_get_param(struct pipe_screen *screen, enum pipe_cap param)
>> case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
>> case PIPE_CAP_NATIVE_FENCE_FD:
>> case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
>> + case PIPE_CAP_TGSI_DDIV:
>> return 0;
>>
>> case PIPE_CAP_VENDOR_ID:
>> diff --git a/src/gallium/drivers/llvmpipe/lp_screen.c b/src/gallium/drivers/llvmpipe/lp_screen.c
>> index 4501df4..3248c4d 100644
>> --- a/src/gallium/drivers/llvmpipe/lp_screen.c
>> +++ b/src/gallium/drivers/llvmpipe/lp_screen.c
>> @@ -341,6 +341,7 @@ llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
>> case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
>> case PIPE_CAP_NATIVE_FENCE_FD:
>> case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
>> + case PIPE_CAP_TGSI_DDIV:
>> return 0;
>> }
>> /* should only get here on unhandled cases */
>> diff --git a/src/gallium/drivers/nouveau/nv30/nv30_screen.c b/src/gallium/drivers/nouveau/nv30/nv30_screen.c
>> index 19df068..586a85c 100644
>> --- a/src/gallium/drivers/nouveau/nv30/nv30_screen.c
>> +++ b/src/gallium/drivers/nouveau/nv30/nv30_screen.c
>> @@ -206,6 +206,7 @@ nv30_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
>> case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
>> case PIPE_CAP_NATIVE_FENCE_FD:
>> case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
>> + case PIPE_CAP_TGSI_DDIV:
>> return 0;
>>
>> case PIPE_CAP_VENDOR_ID:
>> diff --git a/src/gallium/drivers/nouveau/nv50/nv50_screen.c b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
>> index 5637001..3cf5724 100644
>> --- a/src/gallium/drivers/nouveau/nv50/nv50_screen.c
>> +++ b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
>> @@ -258,6 +258,7 @@ nv50_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
>> case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
>> case PIPE_CAP_NATIVE_FENCE_FD:
>> case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
>> + case PIPE_CAP_TGSI_DDIV:
>> return 0;
>>
>> case PIPE_CAP_VENDOR_ID:
>> diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
>> index b6e4c6c..de00565 100644
>> --- a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
>> +++ b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
>> @@ -275,6 +275,7 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
>> case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
>> case PIPE_CAP_NATIVE_FENCE_FD:
>> case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
>> + case PIPE_CAP_TGSI_DDIV:
>> return 0;
>>
>> case PIPE_CAP_VENDOR_ID:
>> diff --git a/src/gallium/drivers/r300/r300_screen.c b/src/gallium/drivers/r300/r300_screen.c
>> index 50a42ef..bfce22e 100644
>> --- a/src/gallium/drivers/r300/r300_screen.c
>> +++ b/src/gallium/drivers/r300/r300_screen.c
>> @@ -228,6 +228,7 @@ static int r300_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
>> case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
>> case PIPE_CAP_NATIVE_FENCE_FD:
>> case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
>> + case PIPE_CAP_TGSI_DDIV:
>> return 0;
>>
>> /* SWTCL-only features. */
>> diff --git a/src/gallium/drivers/r600/r600_pipe.c b/src/gallium/drivers/r600/r600_pipe.c
>> index a0da24f..263d09c 100644
>> --- a/src/gallium/drivers/r600/r600_pipe.c
>> +++ b/src/gallium/drivers/r600/r600_pipe.c
>> @@ -376,7 +376,8 @@ static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
>> case PIPE_CAP_TGSI_ARRAY_COMPONENTS:
>> case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
>> case PIPE_CAP_NATIVE_FENCE_FD:
>> - case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
>> + case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
>> + case PIPE_CAP_TGSI_DDIV:
>> return 0;
>>
>> case PIPE_CAP_MAX_SHADER_PATCH_VARYINGS:
>> diff --git a/src/gallium/drivers/radeonsi/si_pipe.c b/src/gallium/drivers/radeonsi/si_pipe.c
>> index 842eb59..fdf9bee 100644
>> --- a/src/gallium/drivers/radeonsi/si_pipe.c
>> +++ b/src/gallium/drivers/radeonsi/si_pipe.c
>> @@ -413,7 +413,8 @@ static int si_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
>> case PIPE_CAP_CULL_DISTANCE:
>> case PIPE_CAP_TGSI_ARRAY_COMPONENTS:
>> case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
>> - case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
>> + case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
>> + case PIPE_CAP_TGSI_DDIV:
>> return 1;
>>
>> case PIPE_CAP_RESOURCE_FROM_USER_MEMORY:
>> diff --git a/src/gallium/drivers/softpipe/sp_screen.c b/src/gallium/drivers/softpipe/sp_screen.c
>> index 93c7503..ab1a877 100644
>> --- a/src/gallium/drivers/softpipe/sp_screen.c
>> +++ b/src/gallium/drivers/softpipe/sp_screen.c
>> @@ -291,6 +291,7 @@ softpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
>> case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
>> case PIPE_CAP_NATIVE_FENCE_FD:
>> case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
>> + case PIPE_CAP_TGSI_DDIV:
>> return 0;
>> case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
>> return 4;
>> diff --git a/src/gallium/drivers/svga/svga_screen.c b/src/gallium/drivers/svga/svga_screen.c
>> index 3e27474..2ae4ee7 100644
>> --- a/src/gallium/drivers/svga/svga_screen.c
>> +++ b/src/gallium/drivers/svga/svga_screen.c
>> @@ -422,6 +422,7 @@ svga_get_param(struct pipe_screen *screen, enum pipe_cap param)
>> case PIPE_CAP_TGSI_ARRAY_COMPONENTS:
>> case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
>> case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
>> + case PIPE_CAP_TGSI_DDIV:
>> return 0;
>> }
>>
>> diff --git a/src/gallium/drivers/swr/swr_screen.cpp b/src/gallium/drivers/swr/swr_screen.cpp
>> index 5012388..bca6047 100644
>> --- a/src/gallium/drivers/swr/swr_screen.cpp
>> +++ b/src/gallium/drivers/swr/swr_screen.cpp
>> @@ -315,6 +315,7 @@ swr_get_param(struct pipe_screen *screen, enum pipe_cap param)
>> case PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME:
>> case PIPE_CAP_NATIVE_FENCE_FD:
>> case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
>> + case PIPE_CAP_TGSI_DDIV:
>> return 0;
>>
>> case PIPE_CAP_VENDOR_ID:
>> diff --git a/src/gallium/drivers/vc4/vc4_screen.c b/src/gallium/drivers/vc4/vc4_screen.c
>> index 3da6202..7318425 100644
>> --- a/src/gallium/drivers/vc4/vc4_screen.c
>> +++ b/src/gallium/drivers/vc4/vc4_screen.c
>> @@ -242,6 +242,7 @@ vc4_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
>> case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
>> case PIPE_CAP_NATIVE_FENCE_FD:
>> case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
>> + case PIPE_CAP_TGSI_DDIV:
>> return 0;
>>
>> /* Stream output. */
>> diff --git a/src/gallium/drivers/virgl/virgl_screen.c b/src/gallium/drivers/virgl/virgl_screen.c
>> index 0a18aa0..05bdd37 100644
>> --- a/src/gallium/drivers/virgl/virgl_screen.c
>> +++ b/src/gallium/drivers/virgl/virgl_screen.c
>> @@ -252,6 +252,7 @@ virgl_get_param(struct pipe_screen *screen, enum pipe_cap param)
>> case PIPE_CAP_TGSI_ARRAY_COMPONENTS:
>> case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
>> case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
>> + case PIPE_CAP_TGSI_DDIV:
>> return 0;
>> case PIPE_CAP_VENDOR_ID:
>> return 0x1af4;
>> diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
>> index 7dfd7dd..28e134c 100644
>> --- a/src/gallium/include/pipe/p_defines.h
>> +++ b/src/gallium/include/pipe/p_defines.h
>> @@ -744,6 +744,7 @@ enum pipe_cap
>> PIPE_CAP_TGSI_CAN_READ_OUTPUTS,
>> PIPE_CAP_NATIVE_FENCE_FD,
>> PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY,
>> + PIPE_CAP_TGSI_DDIV,
>> };
>>
>> #define PIPE_QUIRK_TEXTURE_BORDER_COLOR_SWIZZLE_NV50 (1 << 0)
>>
>
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