FFmpeg

400 Tags

492 MiB

Author	SHA1	Message	Date
Rémi Denis-Courmont	d452db8410	lavc/vc1dsp: R-V V vc1_unescape_buffer Notes: - The loop is biased toward no unescaped bytes as that should be most common. - The input byte array is slid rather than the (8 times smaller) bit-mask, as RISC-V V does not provide a bit-mask (or bit-wise) slide instruction. - There are two comparisons with 0 per iteration, for the same reason. - In case of match, bytes are copied until the first match, and the loop is restarted after the escape byte. Vector compression (vcompress.vm) could discard all escape bytes but that is slower if escape bytes are rare. Further optimisations should be possible, e.g.: - processing 2 bytes fewer per iteration to get rid of a 2 slides, - taking a short cut if the input vector contains less than 2 zeroes. But this is a good starting point: T-Head C908: vc1dsp.vc1_unescape_buffer_c: 12749.5 vc1dsp.vc1_unescape_buffer_rvv_i32: 6009.0 SpacemiT X60: vc1dsp.vc1_unescape_buffer_c: 11038.0 vc1dsp.vc1_unescape_buffer_rvv_i32: 2061.0	10 months ago
sunyuechi	d4083ecb7c	lavc/vc1dsp: R-V V mspel_pixels C908 X60 vc1dsp.avg_vc1_mspel_pixels_tab[0][0]_c : 14.7 13.2 vc1dsp.avg_vc1_mspel_pixels_tab[0][0]_rvv_i32 : 2.5 2.2 vc1dsp.avg_vc1_mspel_pixels_tab[1][0]_c : 3.7 3.5 vc1dsp.avg_vc1_mspel_pixels_tab[1][0]_rvv_i64 : 1.0 1.2 vc1dsp.put_vc1_mspel_pixels_tab[0][0]_c : 9.0 8.0 vc1dsp.put_vc1_mspel_pixels_tab[0][0]_rvi : 1.0 1.0 vc1dsp.put_vc1_mspel_pixels_tab[1][0]_c : 2.5 2.2 vc1dsp.put_vc1_mspel_pixels_tab[1][0]_rvi : 0.5 0.5 Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>	10 months ago
Rémi Denis-Courmont	419145c11b	lavc/vc1dsp: fix R-V V vector lengths The 8x4 and 4x4 use a needlessly large multiplier (unless/until we care about embedded 64-bit-vector hardware). This is merely suboptimal. The 8x4 case also uses an incorrect vector length, which leads to incorrect behaviour on future/hypothetical hardware with 256-bit or larger vectors. Pointed-out-by: Martin Storsjö <martin@martin.st>	1 year ago
sunyuechi	0b9d009b4a	lavc/vc1dsp: R-V V inv_trans C908: vc1dsp.vc1_inv_trans_4x4_dc_c: 125.7 vc1dsp.vc1_inv_trans_4x4_dc_rvv_i32: 53.5 vc1dsp.vc1_inv_trans_4x8_dc_c: 230.7 vc1dsp.vc1_inv_trans_4x8_dc_rvv_i32: 65.5 vc1dsp.vc1_inv_trans_8x4_dc_c: 228.7 vc1dsp.vc1_inv_trans_8x4_dc_rvv_i64: 64.5 vc1dsp.vc1_inv_trans_8x8_dc_c: 476.5 vc1dsp.vc1_inv_trans_8x8_dc_rvv_i64: 80.2 Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>	1 year ago

4 Commits (8a96495fef05eac704131dff25d0ef1b410d13a7)