LOAD / STORE ISA

• Instruction set:

  add, sub, mult, div, … only on registers
  
  ld, st, to move data from and to memory, only way to access memory
  

Example: a*b - (a+c*b)

r1, r2, r3

ld r1, c 2, ?, ?

ld r2, b 2, 3, ?

mult r1, r1, r2 6, 3, ?

ld r3, a 6, 3, 4

add r1, r1, r3 10, 3, 4

mult r2, r2, r3 10, 12, 4

sub r3, r2, r1 10, 12, 2

7 instructions

4

3

2

a

b

c

Previous slide

Next slide

Back to first slide

View graphic version