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For cases with indented, nested .if/.macro in asm.S, ident those
by 4 chars.
Some initial assembly files were indented to 4/16 columns, while all
the actual implementation files, starting with src/arm/64/mc.S, have
used 8/24 for indentation.
A symbol starting with two leading underscores is reserved for
the compiler/standard library implementation.
Also remove the trailing two double underscores for consistency
and symmetry.
Relative speedups measured with checkasm:
Cortex A7 A8 A9 A53 Snapdragon 835
mc_8tap_regular_w2_0_8bpc_neon: 9.63 4.05 3.82 5.41 5.68
mc_8tap_regular_w2_h_8bpc_neon: 3.30 5.44 3.38 3.88 5.12
mc_8tap_regular_w2_hv_8bpc_neon: 3.86 6.21 4.39 5.18 6.10
mc_8tap_regular_w2_v_8bpc_neon: 4.69 5.43 3.56 7.27 4.86
mc_8tap_regular_w4_0_8bpc_neon: 9.13 4.05 5.24 5.37 6.60
mc_8tap_regular_w4_h_8bpc_neon: 4.38 7.11 4.61 6.59 7.15
mc_8tap_regular_w4_hv_8bpc_neon: 5.11 9.77 7.37 9.21 10.29
mc_8tap_regular_w4_v_8bpc_neon: 6.24 7.88 4.96 11.16 7.89
mc_8tap_regular_w8_0_8bpc_neon: 9.12 4.20 5.59 5.59 9.25
mc_8tap_regular_w8_h_8bpc_neon: 5.91 8.42 4.84 8.46 7.08
mc_8tap_regular_w8_hv_8bpc_neon: 5.46 8.35 6.52 7.19 8.33
mc_8tap_regular_w8_v_8bpc_neon: 7.53 8.96 6.28 16.08 10.66
mc_8tap_regular_w16_0_8bpc_neon: 9.77 5.46 4.06 7.02 7.38
mc_8tap_regular_w16_h_8bpc_neon: 6.33 8.87 5.03 10.30 4.29
mc_8tap_regular_w16_hv_8bpc_neon: 5.00 7.84 6.15 6.83 7.44
mc_8tap_regular_w16_v_8bpc_neon: 7.74 8.81 6.23 19.24 11.16
mc_8tap_regular_w32_0_8bpc_neon: 6.11 4.63 2.44 5.92 4.70
mc_8tap_regular_w32_h_8bpc_neon: 6.60 9.02 5.20 11.08 3.50
mc_8tap_regular_w32_hv_8bpc_neon: 4.85 7.64 6.09 6.68 6.92
mc_8tap_regular_w32_v_8bpc_neon: 7.61 8.36 6.13 19.94 11.17
mc_8tap_regular_w64_0_8bpc_neon: 4.61 3.81 1.60 3.50 2.73
mc_8tap_regular_w64_h_8bpc_neon: 6.72 9.07 5.21 11.41 3.10
mc_8tap_regular_w64_hv_8bpc_neon: 4.67 7.43 5.92 6.43 6.59
mc_8tap_regular_w64_v_8bpc_neon: 7.64 8.28 6.07 20.48 11.41
mc_8tap_regular_w128_0_8bpc_neon: 2.41 3.13 1.11 2.31 1.73
mc_8tap_regular_w128_h_8bpc_neon: 6.68 9.03 5.09 11.41 2.90
mc_8tap_regular_w128_hv_8bpc_neon: 4.50 7.39 5.70 6.26 6.47
mc_8tap_regular_w128_v_8bpc_neon: 7.21 8.23 5.88 19.82 11.42
mc_bilinear_w2_0_8bpc_neon: 9.23 4.03 3.74 5.33 6.49
mc_bilinear_w2_h_8bpc_neon: 2.07 3.52 2.71 2.35 3.40
mc_bilinear_w2_hv_8bpc_neon: 2.60 5.24 2.73 2.74 3.89
mc_bilinear_w2_v_8bpc_neon: 2.57 4.39 3.14 3.04 4.05
mc_bilinear_w4_0_8bpc_neon: 8.74 4.03 5.38 5.28 6.53
mc_bilinear_w4_h_8bpc_neon: 3.41 6.22 4.28 3.86 7.56
mc_bilinear_w4_hv_8bpc_neon: 4.38 7.45 4.61 5.26 7.95
mc_bilinear_w4_v_8bpc_neon: 3.65 6.57 4.51 4.45 7.62
mc_bilinear_w8_0_8bpc_neon: 8.74 4.50 5.71 5.46 9.39
mc_bilinear_w8_h_8bpc_neon: 6.14 10.71 6.78 6.88 14.10
mc_bilinear_w8_hv_8bpc_neon: 7.11 12.80 8.24 11.08 7.83
mc_bilinear_w8_v_8bpc_neon: 7.24 11.69 7.57 8.04 15.46
mc_bilinear_w16_0_8bpc_neon: 10.01 5.47 4.07 6.97 7.64
mc_bilinear_w16_h_8bpc_neon: 8.36 17.00 8.34 11.61 7.64
mc_bilinear_w16_hv_8bpc_neon: 7.67 13.54 8.53 13.32 8.05
mc_bilinear_w16_v_8bpc_neon: 10.19 22.56 10.52 15.39 10.62
mc_bilinear_w32_0_8bpc_neon: 6.22 4.73 2.43 5.89 4.90
mc_bilinear_w32_h_8bpc_neon: 9.47 18.96 9.34 13.10 7.24
mc_bilinear_w32_hv_8bpc_neon: 7.95 13.15 9.49 13.78 8.71
mc_bilinear_w32_v_8bpc_neon: 11.10 23.53 11.34 16.74 8.78
mc_bilinear_w64_0_8bpc_neon: 4.58 3.82 1.59 3.46 2.71
mc_bilinear_w64_h_8bpc_neon: 10.07 19.77 9.60 13.99 6.88
mc_bilinear_w64_hv_8bpc_neon: 8.08 12.95 9.39 13.84 8.90
mc_bilinear_w64_v_8bpc_neon: 11.49 23.85 11.12 17.13 7.90
mc_bilinear_w128_0_8bpc_neon: 2.37 3.24 1.15 2.28 1.73
mc_bilinear_w128_h_8bpc_neon: 9.94 18.84 8.66 13.91 6.74
mc_bilinear_w128_hv_8bpc_neon: 7.26 12.82 8.97 12.43 8.88
mc_bilinear_w128_v_8bpc_neon: 9.89 23.88 8.93 14.73 7.33
mct_8tap_regular_w4_0_8bpc_neon: 2.82 4.46 2.72 3.50 5.41
mct_8tap_regular_w4_h_8bpc_neon: 4.16 6.88 4.64 6.51 6.60
mct_8tap_regular_w4_hv_8bpc_neon: 5.22 9.87 7.81 9.39 10.11
mct_8tap_regular_w4_v_8bpc_neon: 5.81 7.72 4.80 10.16 6.85
mct_8tap_regular_w8_0_8bpc_neon: 4.48 6.30 3.01 5.82 5.04
mct_8tap_regular_w8_h_8bpc_neon: 5.59 8.04 4.18 8.68 8.30
mct_8tap_regular_w8_hv_8bpc_neon: 5.34 8.32 6.42 7.04 7.99
mct_8tap_regular_w8_v_8bpc_neon: 7.32 8.71 5.75 17.07 9.73
mct_8tap_regular_w16_0_8bpc_neon: 5.05 9.60 3.64 10.06 4.29
mct_8tap_regular_w16_h_8bpc_neon: 5.53 8.20 4.54 9.98 7.33
mct_8tap_regular_w16_hv_8bpc_neon: 4.90 7.87 6.07 6.67 7.03
mct_8tap_regular_w16_v_8bpc_neon: 7.39 8.55 5.72 19.64 9.98
mct_8tap_regular_w32_0_8bpc_neon: 5.28 8.16 4.07 11.03 2.38
mct_8tap_regular_w32_h_8bpc_neon: 5.97 8.31 4.67 10.63 6.72
mct_8tap_regular_w32_hv_8bpc_neon: 4.73 7.65 5.98 6.51 6.31
mct_8tap_regular_w32_v_8bpc_neon: 7.33 8.18 5.72 20.50 10.03
mct_8tap_regular_w64_0_8bpc_neon: 5.11 9.19 4.01 10.61 1.92
mct_8tap_regular_w64_h_8bpc_neon: 6.05 8.33 4.53 10.84 6.38
mct_8tap_regular_w64_hv_8bpc_neon: 4.61 7.54 5.69 6.35 6.11
mct_8tap_regular_w64_v_8bpc_neon: 7.27 8.06 5.39 20.41 10.15
mct_8tap_regular_w128_0_8bpc_neon: 4.29 8.21 4.28 9.55 1.32
mct_8tap_regular_w128_h_8bpc_neon: 6.01 8.26 4.43 10.78 6.20
mct_8tap_regular_w128_hv_8bpc_neon: 4.49 7.49 5.46 6.11 5.96
mct_8tap_regular_w128_v_8bpc_neon: 6.90 8.00 5.19 18.47 10.13
mct_bilinear_w4_0_8bpc_neon: 2.70 4.53 2.67 3.32 5.11
mct_bilinear_w4_h_8bpc_neon: 3.02 5.06 3.13 3.28 5.38
mct_bilinear_w4_hv_8bpc_neon: 4.14 7.04 4.75 4.99 6.30
mct_bilinear_w4_v_8bpc_neon: 3.17 5.30 3.66 3.87 5.01
mct_bilinear_w8_0_8bpc_neon: 4.41 6.46 2.99 5.74 5.98
mct_bilinear_w8_h_8bpc_neon: 5.36 8.27 3.62 6.39 9.06
mct_bilinear_w8_hv_8bpc_neon: 6.65 11.82 6.79 11.47 7.07
mct_bilinear_w8_v_8bpc_neon: 6.26 9.62 4.05 7.75 16.81
mct_bilinear_w16_0_8bpc_neon: 4.86 9.85 3.61 10.03 4.19
mct_bilinear_w16_h_8bpc_neon: 5.26 12.91 4.76 9.56 9.68
mct_bilinear_w16_hv_8bpc_neon: 6.96 12.58 7.05 13.48 7.35
mct_bilinear_w16_v_8bpc_neon: 6.46 17.94 5.72 13.70 19.20
mct_bilinear_w32_0_8bpc_neon: 5.31 8.10 4.06 10.88 2.77
mct_bilinear_w32_h_8bpc_neon: 6.91 14.28 5.33 11.24 10.33
mct_bilinear_w32_hv_8bpc_neon: 7.13 12.21 7.57 13.91 7.19
mct_bilinear_w32_v_8bpc_neon: 8.06 18.48 5.88 14.74 15.47
mct_bilinear_w64_0_8bpc_neon: 5.08 7.29 3.83 10.44 1.71
mct_bilinear_w64_h_8bpc_neon: 7.24 14.59 5.40 11.70 11.03
mct_bilinear_w64_hv_8bpc_neon: 7.24 11.98 7.59 13.72 7.30
mct_bilinear_w64_v_8bpc_neon: 8.20 18.24 5.69 14.57 15.04
mct_bilinear_w128_0_8bpc_neon: 4.35 8.23 4.17 9.71 1.11
mct_bilinear_w128_h_8bpc_neon: 7.02 13.80 5.63 11.11 11.26
mct_bilinear_w128_hv_8bpc_neon: 6.31 11.89 6.75 12.12 7.24
mct_bilinear_w128_v_8bpc_neon: 6.95 18.26 5.84 11.31 14.78