Pipeline questions Consider the memory location 0x 10000000 has the value 000000

Question

Pipeline questions

Consider the memory location 0x 10000000 has the value 00000014 Sa3 holds the address 0x10000000 and $t1 holds the value 5 Consider the following MIPS code sequence with a 5-stage pipeline without data forwarding: addi Stl, Stl, 2 lw Stl, 0(Sa3) addi $t2, $t1, 5 addi Stl, Stl, 12 What are the contents of the registers St1, St2 and $a3 after the code sequence above is executed? Consider initial values of registers St1 St2 St3 Given below is a sequence of MIPS instructions with a 5-stage pipeline without data forwarding: Loop: sll St2, $t2,1 addi St2, St2, 1 bne Stl, St3, Loop addi Stl, Stl, 1 What are the contents of the registers St1, St2 and St3 after the code sequence is executed?

Explanation / Answer

Answer is as follows :

According to Chegg Guidelines, We are allowed to solve only first part of the question, So please repost others.

So now we have

$t1 = 5

$a3 at memory location whcih stores 00000014 in hexadecimal for which decimal equivalent is 00000020 in decimal.

So for given instructions :

a) addi $t1, $t1, 2

The instruction immediately add the 2 with contents of $t1 and store thee result back to $t1.

So $t1 = $t1 + 2

$t1 = 5 + 2 = 7

So upto know $t1 contains 7.

b) lw $t1,0($a3)

it loads the contents of 0 + $a3 to regiter $t1.

We have data 20 in $a3.

So after adding 0+20 = 20 i.e. store in $t1.

So upto know $t1 contains 20

c) addi $t2, $t1, 5

it add the contents of $t1 with 5 and store the result to register $t2.

$t2 = $t1 + 5

$t2 = 20 + 5 = 25

So upto know

$t1 contains 20

$t2 contains 25

d) addi $t1, $t1, 12

It add the contents of $t1 with 12 and store them back to $t1.

So

$t1 = $t1 + 12

$t1 = 20 + 12 = 32

So $t1 contains 32.

So the final contents are :

$t1 = 32

$t2 = 25

$a3 = 20

All the data are in decimal.

if there is any query or you want other part please ask in comments...

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