Question

For the initial register values shown below, what is the value of $t0, $t1 and $t2 after executing each instruction in binary system? What is the final value of $t0, $t1 and $t2 in hexadecimal system?

$t0 = 0xAAAAAAAA (hex) = 1010 1010 1010 1010 1010 1010 1010 1010

$t1 = 0x87654321 (hex) = 1000 0111 0110 0101 0100 0011 0010 0001

sll $t2, $t0, 4

or $t2, $t2, $t1

nor $t2, $t2, $t1

slt $t0, $t2, $t1

sltu $t0, $t2, $t1

srl $t2, $t0, 3

addi $t2, $t2, 7

Answer 1

sll means shift left logical

or logic is If any input is 1 then output is 1 otherwise 0

nor logic is if both input is 0 then output is 1 otherwise 0

slt $to,$t2,$t1 means if signed($t2)<signed($t1) then set $t0 to 1 otherwise 0

sltu $to,$t2,$t1 means if unsigned($t2)<unsigned($t1) then set $t0 to 1 otherwise 0

srl means right shift logical

addi $t2,$t2,7 means add 0111 to $t2