Files
FFmpeg/libavcodec
Jun Zhao ce89d974c8 lavc/hevc: add aarch64 neon for 10-bit dequant
Implement NEON optimization for HEVC dequant at 10-bit depth.

For 10-bit: shift = 15 - 10 - log2_size = 5 - log2_size

Performance benchmark on Apple M4:
./tests/checkasm/checkasm --test=hevc_dequant --bench
hevc_dequant_4x4_10_c:                                  16.6 ( 1.00x)
hevc_dequant_4x4_10_neon:                                7.4 ( 2.23x)

hevc_dequant_8x8_10_c:                                  39.7 ( 1.00x)
hevc_dequant_8x8_10_neon:                                7.5 ( 5.28x)

hevc_dequant_16x16_10_c:                               168.7 ( 1.00x)
hevc_dequant_16x16_10_neon:                             10.2 (16.56x)

hevc_dequant_32x32_10_c:                                 1.9 ( 1.00x)
hevc_dequant_32x32_10_neon:                              1.9 ( 1.01x)

Note: 32x32 shift=0 is identity transform (no-op), so NEON has no
advantage over C which is also optimized away by the compiler.

Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
2026-01-25 06:55:26 +00:00
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