DGEMM doesn’t necessarily win over MATMUL for small matrices. Useful in e.g rotation matrices in finite element codes, and lots of other areas. Since matmul can

DGEMM doesn’t necessarily win over MATMUL for small matrices. Useful in e.g rotation matrices in finite element codes, and lots of other areas. Since matmul can be done with inlined loops, you also avoid the function call overhead, but it looks like a function call which is good for readability.