vN Model Contributes To Success
•The
cost of C statements on the vN machine is “understood” by C programmers …
•How
much time does A[r][s] += B[r][s]; require?
•Load
row_size_A, r, s, A_base, B_base (5)
•temp =
(row_size_A * r + s) * data_size (3)
•A_base
+ temp; B_base + temp; load both values (4)
•Add
values and return to memory (2)
•Same
for many operations, any data size
•Result
is measured in “instructions” not time
•Efficient and Economical and Easy
to Write
Widely known and effectively used