WIZ-level parallelism - page 1

Earlier (in the chapter "Timing: ILP and OOO") we saw how parallelism works with the hardware in a single WIZ on a single WIZ bus. For example, in a WIZ with a hardware multiplier, divider, and adder on its bus, we can compute: A = x*y, B = p/q, and C = u+v, in two basic ways. Serial, like this:

  x,y -> multiplier -> A
  p,q -> divider    -> B
  u,v -> adder.     -> C

or in parallel, like this:

  x,y -> multiplier
  p,q -> divider
  u,v -> adder
  multiplier -> A
  divider    -> B
  adder      -> C

Here, "multiplier -> A" will wait for the multiplier to complete, but by the time it does, the divider and adder will likely be done as well and add no wait time.