[FFmpeg-devel] [PATCH v3 0/5] avcodec/ac3: Add aarch64 NEON DSP

[Geoff Hill]

Here's v3 to push the AC-3 ARMv8 NEON experiment a step further.

This version implements 5 of the AC-3 encoder DSP functions,
and adds checkasm tests where missing.

I've tested that the checkasm tests pass on aarch64 and x86.

On AWS Graviton2 (t4g.medium), GCC 12.3:

$ tests/checkasm/checkasm --bench --verbose --test=ac3dsp
...
NEON:
 - ac3dsp.ac3_exponent_min               [OK]
 - ac3dsp.ac3_extract_exponents          [OK]
 - ac3dsp.float_to_fixed24               [OK]
 - ac3dsp.ac3_sum_square_butterfly_int32 [OK]
 - ac3dsp.ac3_sum_square_butterfly_float [OK]
checkasm: all 20 tests passed
ac3_exponent_min_reuse0_c: 9.0
ac3_exponent_min_reuse0_neon: 9.7
ac3_exponent_min_reuse1_c: 1037.5
ac3_exponent_min_reuse1_neon: 54.0
ac3_exponent_min_reuse2_c: 1820.7
ac3_exponent_min_reuse2_neon: 135.2
ac3_exponent_min_reuse3_c: 2080.5
ac3_exponent_min_reuse3_neon: 167.7
ac3_exponent_min_reuse4_c: 2493.2
ac3_exponent_min_reuse4_neon: 200.0
ac3_exponent_min_reuse5_c: 2970.0
ac3_exponent_min_reuse5_neon: 231.7
ac3_extract_exponents_n512_c: 1717.5
ac3_extract_exponents_n512_neon: 506.7
ac3_extract_exponents_n768_c: 2562.7
ac3_extract_exponents_n768_neon: 769.7
ac3_extract_exponents_n1024_c: 3389.2
ac3_extract_exponents_n1024_neon: 1019.0
ac3_extract_exponents_n1280_c: 4210.7
ac3_extract_exponents_n1280_neon: 1267.5
ac3_extract_exponents_n1536_c: 5071.5
ac3_extract_exponents_n1536_neon: 1522.0
ac3_extract_exponents_n1792_c: 5896.5
ac3_extract_exponents_n1792_neon: 1784.0
ac3_extract_exponents_n2048_c: 6779.2
ac3_extract_exponents_n2048_neon: 2051.0
ac3_extract_exponents_n2304_c: 7559.5
ac3_extract_exponents_n2304_neon: 2290.0
ac3_extract_exponents_n2560_c: 8397.2
ac3_extract_exponents_n2560_neon: 2552.5
ac3_extract_exponents_n2816_c: 9224.2
ac3_extract_exponents_n2816_neon: 2797.7
ac3_extract_exponents_n3072_c: 10026.2
ac3_extract_exponents_n3072_neon: 3047.7
ac3_sum_square_bufferfly_float_c: 1605.7
ac3_sum_square_bufferfly_float_neon: 365.7
ac3_sum_square_bufferfly_int32_c: 965.5
ac3_sum_square_bufferfly_int32_neon: 486.2
float_to_fixed24_c: 2453.7
float_to_fixed24_neon: 516.2

Geoff Hill (5):
  avcodec/ac3: Implement float_to_fixed24 for aarch64 NEON
  avcodec/ac3: Implement ac3_exponent_min for aarch64 NEON
  avcodec/ac3: Implement ac3_extract_exponents for aarch64 NEON
  avcodec/ac3: Implement sum_square_butterfly_int32 for aarch64 NEON
  avcodec/ac3: Implement sum_square_butterfly_float for aarch64 NEON

 libavcodec/aarch64/Makefile              |   2 +
 libavcodec/aarch64/ac3dsp_init_aarch64.c |  50 +++++++++
 libavcodec/aarch64/ac3dsp_neon.S         | 125 ++++++++++++++++++++++
 libavcodec/ac3dsp.c                      |   4 +-
 libavcodec/ac3dsp.h                      |   3 +-
 tests/checkasm/ac3dsp.c                  | 130 +++++++++++++++++++++++
 6 files changed, 312 insertions(+), 2 deletions(-)
 create mode 100644 libavcodec/aarch64/ac3dsp_init_aarch64.c
 create mode 100644 libavcodec/aarch64/ac3dsp_neon.S

-- 
2.44.0