GEMM on Raspberry Pi (2)

Besides the nested loop, there are alternative ways to compute GEMM.

GEMM using GEMV

GEMM can be computed using GEMV as shown below.

GEMM using rank-1 update (GER)

GEMM can also be viewed as a series of rank-1 update (GER) operations.

Performance

If we don’t use GEMV or GER from a good BLAS and just use a naive loop, the performance can be even worse than our JPI loop.