Assembly Theory -

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we're working assembly. i'm kind of lost. practice question on study guide:

using hypothetical machines (3-address, 2-address, 1-address , 0-address) , following commands:

load= puts value in address add = + mult = * sub = - lda=load in accumulator sta = loads accumulator memory push=copies stack pop=copies stack

show each machine instructions perform following task:

f=e+(a-c) – (b*e)

a. can explain how 4 different machine types differ in terms of code? b. can show me how 1 of 4 place start?

3-addr. (result , ops memory) mult b, b, e sub  f, a, c sub  f, f, b add  f, e, f  2-addr (shared result , 1 op) mult b, e sub  a, c load f, e add  f, sub  f, b  1-addr (accu only) lda  b mult e sta  b lda  sub  c sta  lda  e add  sub  b sta  f  0-addr (stack only) push e push push c sub add push b push e mult sub pop f

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