Mojo Academy · Lesson

Optimizing the Inner Product

Vectorize and unroll the dot product.

The Dot Product Core

The inner product multiplies two sequences element by element and adds the results. Speeding it up speeds your whole matmul.

var acc: Float32 = 0.0
for k in range(K):
    acc += a[k] * b[k]

A plain loop handles a single pair per step. Modern CPUs can do many at once, so scalar code leaves lanes idle.