arm: vp9: Add NEON itxfm routines

Multimedia / Libav - Martin Storsjö [martin.st] - 11 November 2016 03:09 UTC

This work is sponsored by, and copyright, Google.

For the transforms up to 8x8, we can fit all the data (including temporaries) in registers and just do a straightforward transform of all the data. For 16x16, we do a transform of 4x16 pixels in 4 slices, using a temporary buffer. For 32x32, we transform 4x32 pixels at a time, in two steps of 4x16 pixels each.

Examples of relative speedup compared to the C version, from checkasm: Cortex A7 A8 A9 A53
vp9_inv_adst_adst_4x4_add_neon: 3.39 5.83 4.17 4.01
vp9_inv_adst_adst_8x8_add_neon: 3.79 4.86 4.23 3.98
vp9_inv_adst_adst_16x16_add_neon: 3.33 4.36 4.11 4.16
vp9_inv_dct_dct_4x4_add_neon: 4.06 6.16 4.59 4.46
vp9_inv_dct_dct_8x8_add_neon: 4.61 6.01 4.98 4.86
vp9_inv_dct_dct_16x16_add_neon: 3.35 3.44 3.36 3.79
vp9_inv_dct_dct_32x32_add_neon: 3.89 3.50 3.79 4.42
vp9_inv_wht_wht_4x4_add_neon: 3.22 5.13 3.53 3.77

Thus, the speedup vs C code is around 3-6x.

This is mostly marginally faster than the corresponding routines in libvpx on most cores, tested with their 32x32 idct (compared to
vpx_idct32x32_1024_add_neon). These numbers are slightly in libvpx's favour since their version doesn't clear the input buffer like ours do (although the effect of that on the total runtime probably is negligible.)

Cortex A7 A8 A9 A53
vp9_inv_dct_dct_32x32_add_neon: 18436.8 16874.1 14235.1 11988.9 libvpx vpx_idct32x32_1024_add_neon 20789.0 13344.3 15049.9 13030.5

Only on the Cortex A8, the libvpx function is faster. On the other cores, ours is slightly faster even though ours has got source block clearing integrated.

a67ae67 arm: vp9: Add NEON itxfm routines
libavcodec/arm/Makefile | 3 +-
libavcodec/arm/vp9dsp_init_arm.c | 51 +-
libavcodec/arm/vp9itxfm_neon.S | 1174 ++++++++++++++++++++++++++++++++++++++
3 files changed, 1226 insertions(+), 2 deletions(-)

Upstream: git.libav.org

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