The LC-3 ISA has been augmented with the following push and pop instructions. Push Rn pushes the value in Register n onto the stack. Pop Rn removes a value from the stack and loads it into Rn. The following figure shows a snapshot of the eight registers of the LC-3 BEFORE and AFTER the following six stack operations are performed. Identify (a)-(d).

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The LC-3 ISA has been augmented with the following push and pop instructions.
Push Rn pushes the value in Register n onto the stack. Pop Rn removes a value
from the stack and loads it into Rn. The following figure shows a snapshot of the
eight registers of the LC-3 BEFORE and AFTER the following six stack
operations are performed. Identify (a)-(d).
BEFORE
AFTER
RO
х0000
PUSH
R5
RO
х0000
R1
x1111
PUSH (a)
R1
x5555
R2
x2222
РОP
(b)
R2
x3333
R3
x3333
PUSH (c)
R3
x3333
R4
x4444
РОP
R2
R4
x4444
R5
x5555
РОP
(d)
R5
x5555
R6
x6666
R6
x4444
R7
x7777
R7
x7777
Transcribed Image Text:The LC-3 ISA has been augmented with the following push and pop instructions. Push Rn pushes the value in Register n onto the stack. Pop Rn removes a value from the stack and loads it into Rn. The following figure shows a snapshot of the eight registers of the LC-3 BEFORE and AFTER the following six stack operations are performed. Identify (a)-(d). BEFORE AFTER RO х0000 PUSH R5 RO х0000 R1 x1111 PUSH (a) R1 x5555 R2 x2222 РОP (b) R2 x3333 R3 x3333 PUSH (c) R3 x3333 R4 x4444 РОP R2 R4 x4444 R5 x5555 РОP (d) R5 x5555 R6 x6666 R6 x4444 R7 x7777 R7 x7777
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