Relative speedup over C code:

wiener_5tap_8bpc_c:                       13358.0 ( 1.00x)
wiener_5tap_8bpc_lsx:                      2484.7 ( 5.38x)
wiener_7tap_8bpc_c:                       13358.4 ( 1.00x)
wiener_7tap_8bpc_lsx:                      2486.4 ( 5.37x)
sgr_3x3_8bpc_c:                           18989.2 ( 1.00x)
sgr_3x3_8bpc_lsx:                          7981.6 ( 2.38x)
sgr_5x5_8bpc_c:                           17242.0 ( 1.00x)
sgr_5x5_8bpc_lsx:                          5735.5 ( 3.01x)