CS3421 Problem Set 3

Instruction Encoding

Solutions 

  1. 100: addi  $t8,$a2,-17
104: sub   $t0,$t0,$a0
108: lw    $t0,123($zero)
112: bne   $t3,$t4,100
116: add   $s4,$t0,$v0
120: sw    $s5,0($t0)
124: slti  $t1,$t9,-1
128: beq   $t3,$t4,132
132: j     100


  2. 			main:
00: 8c100030			lw	$s0,n
04: 20120001			addi	$s2,$zero,1
08: 02318822			sub	$s1,$s1,$s1
			loop:
12: 001247c0			sll	$t0,$s2,31
16: 0100482a			slt	$t1,$t0,$zero
20: 15200001			bne	$t1,$zero,skip
24: 02328820			add	$s1,$s1,$s2
			skip:
28: 22520001			addi	$s2,$s2,1
32: 12500001			beq	$s2,$s0,done
36: 08000003			j	loop
			done:
40: ac110034			sw	$s1,sum
44: 03e00008			jr	$ra
48: 0000002d		n:	.word	45
52: ????????		sum:	.space	4