y 
y + 
x, also dot product, ...
y 
y + Ax, also triangular solve, rank-1 update
A 
A + BC, also block triangular solve, rank-k update
Level 1, 2, and 3 BLAS
y y + x, also dot product, ...
y y + Ax, also triangular solve, rank-1 update
A A + BC, also block triangular solve, rank-k update