Question

Assume the following register contents:

\(t0=0$\times$AAAAAAAA, \)t1=0$\times$12345678

1. For the register values shown above, what is the value of \(t2 for the following sequence of instructions?

sll \)t2,\(t0,44

or \)t2,\(t2,\)t1

2. For the register values shown above, what is the values of \(t2 for the following sequence of instructions?

sll \)t2,\(t0,4

andi \)t2,\(t2,-1

3. For the register values shown above, what is the value of \)t2 for the following sequence of instructions?

srl \(t2,\)t0,3

andi \(t2,\)t2, 0xFFEF

Short answer

Value of $t2 after the execution of given sequence of instructions:

$$\begin{gathered} 1.0\times BABEFEF8 \\ 2.0\times AAAAAAA0 \\ 3.0\times 00005545 \end{gathered}$$

Step-by-step solution

Define MIPS instructions.

MIPS instructions perform arithmetic operations on registers. MIPS instructions also transfer data between memory and registers. The MIPS assembly language use 32 registers, namely $s0-$s7 and $t0-$t9, $zero, $a0-$a3 etc.

MIPS uses byte addresses, that allow memory to hold data structures, arrays, and registers.

Determine the value of $t2. 

1. The given register contents are,

Instruction:

sll $t2,$t0,44

or $t2,$t2,$t1

The instruction sll will make the logical left shift on $t0, but shift 44 is not negligible because we use only 32 registers, in this case, shift 30 and 14.The value of $t2 is 0xAAAAAA0

Then, the result is stored in $t2.

Now, the value of $t2 and $t1 will perform the logical operation OR.

The values AAAAAAA0 OR 12345678 will be performed.

Then the result $t2= 0xBABEFEF8

Determine the value of $t2.

2. The given register contents are,

Instruction:

sll $t2,$t0,4

andi $t2,$t2,-1

The instruction srl will make the logical right shift on $t0.Then, the value of $t2 is 0xAAAAAAA0

Then, the result is stored in $t2.

Now, the value of $t2 will perform the logical operation AND with immediate -1.

The values AAAAAAA0 AND -1 will be performed.

Then the result $t2=0xAAAAAAA0

Determine the value of $t2.

3. The given register contents are,

Instruction:

srl $t2,$t0,3

andi $t2,$t2,0xFFEF

The instruction srl will make the logical right shift on $t0.Then ,The value of $t2 is 0x15555555

Then, the result is stored in $t2.

Now, the value of $t2 will perform the logical operation AND with immediate 0xFFEF

The values 0AAAAAAA AND 0xFFEF will be performed.

Then, the result $t2= 0x00005545