Embedded Systems Design, 2nd Edition

104 Embedded systems design

With a complete line updated in the cache, the next three

instructions result in a hit, providing there is no preceding flow

change. These benefit from being cached, even though it is their

first execution. This is a great improvement over previous designs,

where the software had to loop before any benefit could be gained.

The table above shows the estimated improvements that can be

obtained.

The effect is similar to increasing the cache size. The largest

effect being with instruction fetches which show the greatest

degree of locality. Data reads are second, but with less impact due

to isolated byte and word accesses. Data read ...