HP MLIB User's Guide Vol. 1 7th Ed.

Chapter 4 Sparse BLAS Operations 439
What you need to know to use these subprograms
the block row and block column dimensions of A, respectively, if TRANSA=0 or
the block column and block row dimensions of A
T
or A* if TRANSA=1 or 2.
Negative dimensions are not allowed. If M, N, K, MB, or KB is equal to zero,
then no operations are performed.
The arguments ALPHA and BETA are both scalar inputs of the same data type
as the matrices.
The arguments B and C are rectangular arrays with first dimension LDB and
LDC, respectively.
The argument WORK is an array of the same data type as A and length
LWORK. If necessary, it is used as scratch space for optimizing performance.