Re: [FFmpeg-devel] [PATCH v5 1/2][GSoC 2024] libavcodec/x86/vvc: Add AVX2 DMVR SAD functions for VVC

[James Almer <jamrial@gmail.com>]

On 5/22/2024 2:02 AM, Andreas Rheinhardt wrote:
> Stone Chen:
>> Implements AVX2 DMVR (decoder-side motion vector refinement) SAD functions. DMVR SAD is only calculated if w >= 8, h >= 8, and w * h > 128. To reduce complexity, SAD is only calculated on even rows. This is calculated for all video bitdepths, but the values passed to the function are always 16bit (even if the original video bitdepth is 8). The AVX2 implementation uses min/max/sub.
>>
>> Additionally this changes parameters dx and dy from int to intptr_t. This allows dx & dy to be used as pointer offsets without needing to use movsxd.
>>
>> Benchmarks ( AMD 7940HS )
>> Before:
>> BQTerrace_1920x1080_60_10_420_22_RA.vvc | 106.0 |
>> Chimera_8bit_1080P_1000_frames.vvc | 204.3 |
>> NovosobornayaSquare_1920x1080.bin | 197.3 |
>> RitualDance_1920x1080_60_10_420_37_RA.266 | 174.0 |
>>
>> After:
>> BQTerrace_1920x1080_60_10_420_22_RA.vvc | 109.3 |
>> Chimera_8bit_1080P_1000_frames.vvc | 216.0 |
>> NovosobornayaSquare_1920x1080.bin | 204.0|
>> RitualDance_1920x1080_60_10_420_37_RA.266 | 181.7 |
>> ---
>>   libavcodec/vvc/dsp.c             |   2 +-
>>   libavcodec/vvc/dsp.h             |   2 +-
>>   libavcodec/x86/vvc/Makefile      |   3 +-
>>   libavcodec/x86/vvc/vvc_sad.asm   | 130 +++++++++++++++++++++++++++++++
>>   libavcodec/x86/vvc/vvcdsp_init.c |   6 ++
>>   5 files changed, 140 insertions(+), 3 deletions(-)
>>   create mode 100644 libavcodec/x86/vvc/vvc_sad.asm
>>
>> diff --git a/libavcodec/x86/vvc/vvcdsp_init.c b/libavcodec/x86/vvc/vvcdsp_init.c
>> index 0e68971b2c..aa6c916760 100644
>> --- a/libavcodec/x86/vvc/vvcdsp_init.c
>> +++ b/libavcodec/x86/vvc/vvcdsp_init.c
>> @@ -311,6 +311,9 @@ ALF_FUNCS(16, 12, avx2)
>>       c->alf.filter[CHROMA] = ff_vvc_alf_filter_chroma_##bd##_avx2;    \
>>       c->alf.classify       = ff_vvc_alf_classify_##bd##_avx2;         \
>>   } while (0)
>> +
>> +int ff_vvc_sad_avx2(const int16_t *src0, const int16_t *src1, intptr_t dx, intptr_t dy, int block_w, int block_h);
>> +#define SAD_INIT() c->inter.sad = ff_vvc_sad_avx2
> 
> You are adding an AVX2 function to an ARCH_X86_64 #if block. I expect
> this to lead to linking failures if AVX2 is disabled.

It's a prototype, so no linking failures. And SAD_INIT() is called on a 
block that both needs ARCH_X86_64 and EXTERNAL_AVX2_FAST to be true.
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