Andi and immediate src src dstsll

MIPS registers

MIPS insruction formats

Instruction “add” belongs to the R-type format.

The “function” field is an extension of the opcode, and

lw $t0, 32($s3)

(LW) LoadWord destination, offset($base register)

lw t0, 32($s3)
add $s1, $s2, $t0

Example
move $t0, $t1 # $t0 ← $t1 The assembler will translate it to add$t0, $zer0, $t1
We will see more of these soon.

Think about these

Q4. How will you load a constant (say 5) into a register?

(Need the immediate mode instructions, likeaddi)

hexadecimal

means “load the 32-bit constant into register $s0.”

Shift left (logical) sll

Shift right (logical) srl

(s0 = $16, t2 = $10)

andi $t2, $s0, 1

This uses I-type format (why?):

Now we have to test if $t2 = 1 or 0

Use bne = branch-nor-equal, beq = branch-equal, and j = jump

data

MEMORY

Let $s6 store the base of the array A. Each element of A

is a 32-bit word.

Anatomy of a MIPS assembly language program running on the MARS simulator

move $t0, $v0
add $t1, $t0, $t0 sw $t1, res($0)

# move the value to $t0 # multiply by 2
# store result in memory