riscv64/itx: Special case 16x16 8bpc dct_dct eob=0
Current performance comparison:
| SpacemiT K1: | Master branch: | itx_16x16: |
|---|---|---|
| inv_txfm_add_16x16_dct_dct_0_8bpc_c: | 1526.8 ( 1.00x) | 1533.2 ( 1.00x) |
| inv_txfm_add_16x16_dct_dct_0_8bpc_rvv: | 1151.4 ( 1.33x) | 176.8 ( 8.67x) |
| Kendryte K230: | Master branch: | itx_16x16: |
|---|---|---|
| inv_txfm_add_16x16_dct_dct_0_8bpc_c: | 1731.3 ( 1.00x) | 1730.7 ( 1.00x) |
| inv_txfm_add_16x16_dct_dct_0_8bpc_rvv: | 1100.5 ( 1.57x) | 153.5 (11.28x) |
Edited by Bogdan Gligorijević