[CS] Number of Operands

 

Three Operands

Add   A, B C

Destination - A

Sources - B and C

(A ← B + C)

 

Opcode

Oprand #1

Operand #2

Operand #3

 

 

 

 

Two Operands

Add   A, B

Destination - A

Sources - A and B

(A ← B + C)

 

Opcode

Operand #1

Operand #2

 

 

 

 

One Operands

(Assume a special registerm accumulator to hold data value)

ADD   A

 Destination - AC (accumulator)

Sources: A and AC

(AC ← AC + A)

 

LD   A

(Load store)

Destination - AC

Source - A

(AC ← A)

 

Opcode

Operand

Temporary store data in AC

 

 

 

 

Zero operand

(Assume a Stack)

PUSH A

PUSH B

ADD (TOS ← A + B)

POP c (c ← TOS)

TOS - Top of Stack

 

 

 

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