mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2026-11-06 13:28:17 +00:00
Gyula Sebok
ea4162f223
Like the x86 versions, these may read and write past the end, here by
up to 15 bytes. The main loops process eight vectors per iteration;
with four, the in-order Cortex-A510 stalls on the latency of the prefix
sums, and add_left_pred_int16 was only 1.25x faster than C there.
checkasm --bench (CPU cycles via perf), seed 12345 (width 983), on a
Dimensity 9000:
Cortex-X2 Cortex-A710 Cortex-A510
add_gradient_pred_c: 2138.4 2183.6 4450.3
add_gradient_pred_neon: 225.7 (9.48x) 380.3 (5.74x) 711.6 (6.25x)
add_left_pred_int16_c: 1926.4 1941.4 2112.0
add_left_pred_int16_neon: 370.6 (5.20x) 630.6 (3.08x) 1058.6 (2.00x)
add_left_pred_rnd_acc_c: 1056.5 1029.6 1743.4
add_left_pred_rnd_acc_neon: 201.9 (5.23x) 347.5 (2.96x) 585.2 (2.98x)
add_left_pred_zero_c: 1056.0 1029.2 1742.3
add_left_pred_zero_neon: 201.8 (5.23x) 347.5 (2.96x) 585.2 (2.98x)
and on a Google Tensor (Pixel 6a):
Cortex-X1 Cortex-A76 Cortex-A55
add_gradient_pred_c: 2137.4 2848.2 6892.2
add_gradient_pred_neon: 238.2 (8.97x) 408.2 (6.98x) 1117.5 (6.17x)
add_left_pred_int16_c: 1935.0 2177.2 3950.8
add_left_pred_int16_neon: 398.0 (4.86x) 664.4 (3.28x) 1690.0 (2.34x)
add_left_pred_rnd_acc_c: 1059.7 1533.9 2967.1
add_left_pred_rnd_acc_neon: 214.5 (4.94x) 378.2 (4.06x) 925.4 (3.21x)
add_left_pred_zero_c: 1059.8 1533.9 2967.1
add_left_pred_zero_neon: 214.5 (4.94x) 378.2 (4.06x) 925.4 (3.21x)
Signed-off-by: Gyula Sebok <gyula.sbk@gmail.com>