Explain the assembly code below step by step in details. Load Addr /Load address

Question

Explain the assembly code below step by step in details.

Load Addr /Load address of first number to be added

Store Next /Store this address as our Next pointer

Load Num /Load the number of items to be added

Subt One /Decrement

Store Ctr /Store this value in Ctr to control looping

Loop, Load Sum/Load the Sum into AC

AddI Next /Add the value pointed to by location Next

Store Sum/Store this sum

Load Next /Load Next

Add One /Increment by one to point to next address

Store Next /Store in our pointer Next

Load Ctr /Load the loop control variable

Subt One /Subtract one from the loop control variable

Store Ctr /Store this new value in loop control variable

Skipcond 000 /If control variable < 0, skip next instruction

Jump Loop /Otherwise, go to Loop

Halt /Terminate program

Addr, Hex 117 /Numbers to be summed start at location 117

Next, Hex 0 /A pointer to the next number to add

Num, Dec 5 /The number of values to add

Sum, Dec 0 /The sum

Ctr, Hex 0 /The loop control variable

One, Dec 1 /Used to increment and decrement by 1

Dec 10 /The values to be added together

Dec 15

Dec 20

Dec 25

Dec 30

Explanation / Answer

Load Addr /Load address of first number to be added
Store Next /Store this address as our Next pointer
Load Num /Load the number of items to be added
Subt One /Decrement
Store Ctr /Store this value in Ctr to control looping
Loop, Load Sum/Load the Sum into AC
AddI Next /Add the value pointed to by location Next
Store Sum/Store this sum
Load Next /Load Next
Add One /Increment by one to point to next address
Store Next /Store in our pointer Next
Load Ctr /Load the loop control variable
Subt One /Subtract one from the loop control variable
Store Ctr /Store this new value in loop control variable
Skipcond 000 /If control variable < 0, skip next instruction
Jump Loop /Otherwise, go to Loop
Halt /Terminate program
Addr, Hex 117 /Numbers to be summed start at location 117
Next, Hex 0 /A pointer to the next number to add
Num, Dec 5 /The number of values to add
Sum, Dec 0 /The sum
Ctr, Hex 0 /The loop control variable
One, Dec 1 /Used to increment and decrement by 1

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