Files
FFmpeg/libavcodec
Zhao Zhili e250854ecf aarch64/h264pred: disable inefficient functions
These assembly optimizations have been identified as "performance
regressions." Due to advancements in modern CPU micro-architectures
and compiler optimization the C implementations now consistently
outperform these handwritten routines.

Test Name          	 A55-clang       M1             A76-gcc-14      A510-clang      A715-clang      X3-clang
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pred8x8_dc_8_neon        55.9 ( 0.79x)!  0.2 ( 0.31x)!  35.7 ( 0.63x)!  98.3 ( 0.37x)!  35.9 ( 0.45x)!  33.6 ( 0.38x)!
pred8x8_dc_10_neon       57.0 ( 1.04x)   0.3 ( 0.36x)!  35.9 ( 0.94x)!  98.2 ( 0.53x)!  35.8 ( 0.58x)!  33.2 ( 0.50x)!
pred8x8_dc_128_8_neon    26.0 ( 0.69x)!  0.1 ( 0.43x)!  15.3 ( 0.73x)!  46.4 ( 0.36x)!  10.6 ( 0.48x)!  10.3 ( 1.09x)
pred8x8_dc_128_10_neon   25.3 ( 0.99x)!  0.1 ( 0.42x)!  19.3 ( 0.48x)!  44.5 ( 0.42x)!  10.0 ( 0.61x)!  11.0 ( 1.00x)
pred8x8_left_dc_8_neon   46.9 ( 0.72x)!  0.2 ( 0.26x)!  30.2 ( 0.49x)!  71.4 ( 0.39x)!  29.8 ( 0.35x)!  26.5 ( 0.44x)!
pred8x8_left_dc_10_neon  45.4 ( 0.82x)!  0.2 ( 0.29x)!  28.1 ( 0.67x)!  70.2 ( 0.47x)!  30.0 ( 0.38x)!  26.5 ( 0.43x)!
pred16x16_dc_8_neon      74.4 ( 1.34x)   0.3 ( 0.62x)!  44.7 ( 0.89x)!  128.0 ( 0.79x)! 48.5 ( 0.67x)!  39.4 ( 0.71x)!
pred16x16_dc_128_8_neon  37.9 ( 0.79x)!  0.1 ( 0.60x)!  20.1 ( 0.80x)!  41.8 ( 0.46x)!  16.2 ( 0.81x)!  12.8 ( 0.95x)!
pred16x16_left_dc_8_neon 69.9 ( 1.19x)   0.3 ( 0.46x)!  49.6 ( 0.54x)!  116.8 ( 0.62x)! 52.8 ( 0.45x)!  44.2 ( 0.51x)!
pred8x8_hori_8_neon      30.6 ( 1.39x)   0.1 ( 0.45x)!  19.4 ( 0.81x)!  71.0 ( 0.50x)!  15.9 ( 0.55x)!  12.2 ( 0.94x)!
pred8x8_hori_10_neon*    29.3 ( 1.82x)   0.1 ( 0.59x)!  18.5 ( 1.56x)   68.9 ( 0.64x)!  15.8 ( 0.62x)!  11.8 ( 0.97x)!
pred8x8_top_dc_8_neon    35.8 ( 0.96x)!  0.1 ( 0.59x)!  16.8 ( 0.81x)!  58.9 ( 0.44x)!  11.3 ( 0.89x)!  11.4 ( 0.99x)!
pred8x8_top_dc_10_neon   37.4 ( 1.24x)   0.1 ( 0.92x)!  20.4 ( 0.81x)!  59.5 ( 0.69x)!  10.5 ( 1.48x)   11.8 ( 1.02x)
pred8x8_vertical_8_neon  18.3 ( 1.08x)   0.1 ( 0.54x)!  12.8 ( 0.89x)!  37.2 ( 0.40x)!   8.3 ( 0.77x)!  11.2 ( 1.00x)
pred8x8_vertical_10_neon 19.0 ( 1.24x)   0.1 ( 0.55x)!  15.3 ( 0.62x)!  39.7 ( 0.50x)!   8.2 ( 0.91x)!  11.1 ( 0.99x)!

- pred8x8_horizontal_10 also underperforms on new architectures, but useful on A55 and A76.

Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
2026-02-04 09:06:37 +00:00
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