Add SSSE3 implementation for the 4x8 and 8x4 blocks in itx

Cycle times:

inv_txfm_add_4x8_adst_adst_0_8bpc_c: 1167.6
inv_txfm_add_4x8_adst_adst_0_8bpc_ssse3: 114.6
inv_txfm_add_4x8_adst_adst_1_8bpc_c: 1167.2
inv_txfm_add_4x8_adst_adst_1_8bpc_ssse3: 114.1
inv_txfm_add_4x8_adst_dct_0_8bpc_c: 1174.7
inv_txfm_add_4x8_adst_dct_0_8bpc_ssse3: 34.8
inv_txfm_add_4x8_adst_dct_1_8bpc_c: 1158.0
inv_txfm_add_4x8_adst_dct_1_8bpc_ssse3: 101.0
inv_txfm_add_4x8_adst_flipadst_0_8bpc_c: 1150.9
inv_txfm_add_4x8_adst_flipadst_0_8bpc_ssse3: 115.8
inv_txfm_add_4x8_adst_flipadst_1_8bpc_c: 1157.6
inv_txfm_add_4x8_adst_flipadst_1_8bpc_ssse3: 115.8
inv_txfm_add_4x8_adst_identity_0_8bpc_c: 848.4
inv_txfm_add_4x8_adst_identity_0_8bpc_ssse3: 59.1
inv_txfm_add_4x8_adst_identity_1_8bpc_c: 850.1
inv_txfm_add_4x8_adst_identity_1_8bpc_ssse3: 59.1
inv_txfm_add_4x8_dct_adst_0_8bpc_c: 1205.6
inv_txfm_add_4x8_dct_adst_0_8bpc_ssse3: 107.0
inv_txfm_add_4x8_dct_adst_1_8bpc_c: 1183.7
inv_txfm_add_4x8_dct_adst_1_8bpc_ssse3: 107.0
inv_txfm_add_4x8_dct_dct_0_8bpc_c: 1227.0
inv_txfm_add_4x8_dct_dct_0_8bpc_ssse3: 34.6
inv_txfm_add_4x8_dct_dct_1_8bpc_c: 1229.7
inv_txfm_add_4x8_dct_dct_1_8bpc_ssse3: 96.1
inv_txfm_add_4x8_dct_flipadst_0_8bpc_c: 1188.2
inv_txfm_add_4x8_dct_flipadst_0_8bpc_ssse3: 109.3
inv_txfm_add_4x8_dct_flipadst_1_8bpc_c: 1192.7
inv_txfm_add_4x8_dct_flipadst_1_8bpc_ssse3: 109.9
inv_txfm_add_4x8_dct_identity_0_8bpc_c: 878.4
inv_txfm_add_4x8_dct_identity_0_8bpc_ssse3: 31.9
inv_txfm_add_4x8_dct_identity_1_8bpc_c: 879.0
inv_txfm_add_4x8_dct_identity_1_8bpc_ssse3: 54.8
inv_txfm_add_4x8_flipadst_adst_0_8bpc_c: 1181.8
inv_txfm_add_4x8_flipadst_adst_0_8bpc_ssse3: 114.7
inv_txfm_add_4x8_flipadst_adst_1_8bpc_c: 1203.0
inv_txfm_add_4x8_flipadst_adst_1_8bpc_ssse3: 114.5
inv_txfm_add_4x8_flipadst_dct_0_8bpc_c: 1203.6
inv_txfm_add_4x8_flipadst_dct_0_8bpc_ssse3: 34.1
inv_txfm_add_4x8_flipadst_dct_1_8bpc_c: 1204.4
inv_txfm_add_4x8_flipadst_dct_1_8bpc_ssse3: 100.2
inv_txfm_add_4x8_flipadst_flipadst_0_8bpc_c: 1180.6
inv_txfm_add_4x8_flipadst_flipadst_0_8bpc_ssse3: 117.1
inv_txfm_add_4x8_flipadst_flipadst_1_8bpc_c: 1178.7
inv_txfm_add_4x8_flipadst_flipadst_1_8bpc_ssse3: 116.8
inv_txfm_add_4x8_flipadst_identity_0_8bpc_c: 871.3
inv_txfm_add_4x8_flipadst_identity_0_8bpc_ssse3: 69.0
inv_txfm_add_4x8_flipadst_identity_1_8bpc_c: 872.3
inv_txfm_add_4x8_flipadst_identity_1_8bpc_ssse3: 70.0
inv_txfm_add_4x8_identity_adst_0_8bpc_c: 1125.2
inv_txfm_add_4x8_identity_adst_0_8bpc_ssse3: 98.7
inv_txfm_add_4x8_identity_adst_1_8bpc_c: 1092.6
inv_txfm_add_4x8_identity_adst_1_8bpc_ssse3: 99.6
inv_txfm_add_4x8_identity_dct_0_8bpc_c: 1139.4
inv_txfm_add_4x8_identity_dct_0_8bpc_ssse3: 38.8
inv_txfm_add_4x8_identity_dct_1_8bpc_c: 1111.0
inv_txfm_add_4x8_identity_dct_1_8bpc_ssse3: 84.1
inv_txfm_add_4x8_identity_flipadst_0_8bpc_c: 1112.4
inv_txfm_add_4x8_identity_flipadst_0_8bpc_ssse3: 100.7
inv_txfm_add_4x8_identity_flipadst_1_8bpc_c: 1098.7
inv_txfm_add_4x8_identity_flipadst_1_8bpc_ssse3: 100.8
inv_txfm_add_4x8_identity_identity_0_8bpc_c: 791.6
inv_txfm_add_4x8_identity_identity_0_8bpc_ssse3: 43.9
inv_txfm_add_4x8_identity_identity_1_8bpc_c: 797.0
inv_txfm_add_4x8_identity_identity_1_8bpc_ssse3: 43.8
inv_txfm_add_8x4_adst_adst_0_8bpc_c: 1102.8
inv_txfm_add_8x4_adst_adst_0_8bpc_ssse3: 108.7
inv_txfm_add_8x4_adst_adst_1_8bpc_c: 1101.8
inv_txfm_add_8x4_adst_adst_1_8bpc_ssse3: 108.9
inv_txfm_add_8x4_adst_dct_0_8bpc_c: 1146.9
inv_txfm_add_8x4_adst_dct_0_8bpc_ssse3: 98.7
inv_txfm_add_8x4_adst_dct_1_8bpc_c: 1157.9
inv_txfm_add_8x4_adst_dct_1_8bpc_ssse3: 98.9
inv_txfm_add_8x4_adst_flipadst_0_8bpc_c: 1144.6
inv_txfm_add_8x4_adst_flipadst_0_8bpc_ssse3: 111.4
inv_txfm_add_8x4_adst_flipadst_1_8bpc_c: 1128.2
inv_txfm_add_8x4_adst_flipadst_1_8bpc_ssse3: 112.4
inv_txfm_add_8x4_adst_identity_0_8bpc_c: 1051.1
inv_txfm_add_8x4_adst_identity_0_8bpc_ssse3: 87.1
inv_txfm_add_8x4_adst_identity_1_8bpc_c: 1059.2
inv_txfm_add_8x4_adst_identity_1_8bpc_ssse3: 87.7
inv_txfm_add_8x4_dct_adst_0_8bpc_c: 1130.2
inv_txfm_add_8x4_dct_adst_0_8bpc_ssse3: 29.0
inv_txfm_add_8x4_dct_adst_1_8bpc_c: 1130.1
inv_txfm_add_8x4_dct_adst_1_8bpc_ssse3: 89.2
inv_txfm_add_8x4_dct_dct_0_8bpc_c: 1186.0
inv_txfm_add_8x4_dct_dct_0_8bpc_ssse3: 26.3
inv_txfm_add_8x4_dct_dct_1_8bpc_c: 1172.2
inv_txfm_add_8x4_dct_dct_1_8bpc_ssse3: 78.8
inv_txfm_add_8x4_dct_flipadst_0_8bpc_c: 1154.7
inv_txfm_add_8x4_dct_flipadst_0_8bpc_ssse3: 29.1
inv_txfm_add_8x4_dct_flipadst_1_8bpc_c: 1150.2
inv_txfm_add_8x4_dct_flipadst_1_8bpc_ssse3: 92.2
inv_txfm_add_8x4_dct_identity_0_8bpc_c: 1078.7
inv_txfm_add_8x4_dct_identity_0_8bpc_ssse3: 29.2
inv_txfm_add_8x4_dct_identity_1_8bpc_c: 1090.1
inv_txfm_add_8x4_dct_identity_1_8bpc_ssse3: 72.2
inv_txfm_add_8x4_flipadst_adst_0_8bpc_c: 1111.6
inv_txfm_add_8x4_flipadst_adst_0_8bpc_ssse3: 108.6
inv_txfm_add_8x4_flipadst_adst_1_8bpc_c: 1112.1
inv_txfm_add_8x4_flipadst_adst_1_8bpc_ssse3: 107.6
inv_txfm_add_8x4_flipadst_dct_0_8bpc_c: 1163.0
inv_txfm_add_8x4_flipadst_dct_0_8bpc_ssse3: 98.3
inv_txfm_add_8x4_flipadst_dct_1_8bpc_c: 1160.0
inv_txfm_add_8x4_flipadst_dct_1_8bpc_ssse3: 99.6
inv_txfm_add_8x4_flipadst_flipadst_0_8bpc_c: 1137.9
inv_txfm_add_8x4_flipadst_flipadst_0_8bpc_ssse3: 112.0
inv_txfm_add_8x4_flipadst_flipadst_1_8bpc_c: 1140.0
inv_txfm_add_8x4_flipadst_flipadst_1_8bpc_ssse3: 112.0
inv_txfm_add_8x4_flipadst_identity_0_8bpc_c: 1057.2
inv_txfm_add_8x4_flipadst_identity_0_8bpc_ssse3: 88.1
inv_txfm_add_8x4_flipadst_identity_1_8bpc_c: 1058.3
inv_txfm_add_8x4_flipadst_identity_1_8bpc_ssse3: 87.1
inv_txfm_add_8x4_identity_adst_0_8bpc_c: 794.0
inv_txfm_add_8x4_identity_adst_0_8bpc_ssse3: 60.6
inv_txfm_add_8x4_identity_adst_1_8bpc_c: 793.4
inv_txfm_add_8x4_identity_adst_1_8bpc_ssse3: 60.6
inv_txfm_add_8x4_identity_dct_0_8bpc_c: 838.4
inv_txfm_add_8x4_identity_dct_0_8bpc_ssse3: 27.4
inv_txfm_add_8x4_identity_dct_1_8bpc_c: 838.5
inv_txfm_add_8x4_identity_dct_1_8bpc_ssse3: 52.0
inv_txfm_add_8x4_identity_flipadst_0_8bpc_c: 825.3
inv_txfm_add_8x4_identity_flipadst_0_8bpc_ssse3: 66.7
inv_txfm_add_8x4_identity_flipadst_1_8bpc_c: 831.7
inv_txfm_add_8x4_identity_flipadst_1_8bpc_ssse3: 66.7
inv_txfm_add_8x4_identity_identity_0_8bpc_c: 768.6
inv_txfm_add_8x4_identity_identity_0_8bpc_ssse3: 40.0
inv_txfm_add_8x4_identity_identity_1_8bpc_c: 743.3
inv_txfm_add_8x4_identity_identity_1_8bpc_ssse3: 39.9