Slide 6.12: Comparison instructions (cont.)

Comparison Instructions (Cont.)

sle rd, rs, rt # set less or equal: Compares two signed 32-bit values. If the contents of rs are less than or equal to the contents of rt (or rs is less than or equal to the immediate value), this instruction sets the destination register to one; otherwise, it sets the destination register to zero.
sgt rd, rs, rt # set greater: Compares two signed 32-bit values. If the contents of rs are greater than the contents of rt (or rs is greater than the immediate value), this instruction sets the destination register to one; otherwise, it sets the destination register to zero.
sge rd, rs, rt # set greater or equal: Compares two signed 32-bit values. If the contents of rs are greater than or equal to the contents of rt (or rs is greater than or equal to the immediate value), this instruction sets the destination register to one; otherwise, it sets the destination register to zero.

seq sne Arithmetic Series

`seq`	`sne`	Arithmetic Series
.text li $t0, 0xFF li $t1, -1 seq $t0, $t0, $t1 beqz $t0, T li $a0, 1 j put T: li $a0, 2 put: li $v0, 1 syscall	.data X: .byte 0xFF .text lb $t0, X sne $t0, $t0, -1 beqz $t0, T li $a0, 1 j put T: li $a0, 2 put: li $v0, 1 syscall	.text li $v0, 5 syscall # input ≥ 0 li $a0, 0 L1: bnez $t0, L2 add $a0, $a0, $v0 sub $v0, $v0, 1 j L1 L2: li $v0, 1 syscall
Output	Output	Output
		1+2+3+...+input

      .text 
      li    $t0, 0xFF
      li    $t1, -1
      seq   $t0, $t0, $t1
      beqz  $t0, T
      li    $a0, 1
      j     put
 T:   li    $a0, 2
 put: li    $v0, 1
      syscall

      .data
 X:   .byte  0xFF

      .text 
      lb    $t0, X
      sne   $t0, $t0, -1
      beqz  $t0, T
      li    $a0, 1
      j     put 
 T:   li    $a0, 2
 put: li    $v0, 1
      syscall

     .text 
     li    $v0, 5
     syscall
     # input ≥ 0
     li    $a0, 0
 L1: 
     bnez  $t0, L2
     add   $a0, $a0, $v0
     sub   $v0, $v0, 1
     j     L1
 L2: li    $v0, 1
     syscall

Output Output Output

1+2+3+...+input