General purpose register - assembly language, Computer Engineering

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General purpose register - assembly language:

Basic ISA Classes:

Accumulator:

1 address add Aacc ←acc + mem [A]

Stack:

0 address add to s ←to s+ next

General Purpose Register:

2 address add A BEA(A) ←EA(A) + EA(B)

3 address add A B CEA(A) ←EA(B) + EA(C)

Load/Store:

3 address add Ra Rb Rc Ra ←Rb+ Rc load Ra RbRa ←mem[Rb]

store Ra Rbmem[Rb] ←Ra

Comparing the Number of Instructions

Code sequence for C=A+B for 4 class of instruction sets

1958_General Purpose Register.png

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