Slide 6.9: Jump and branch instructions (cont.)

Jump and Branch Instructions (Cont.)

j label or b label: Unconditionally jumps to a specified location.
beq rs, rt, label # branch on equal: Branches to the specified label when the contents of rs equal the contents of rt, or it can branch when the contents of rs equal the immediate value.
bne rs, rt, label # branch on not equal: Branches to the specified label when the contents of rs do not equal the contents of rt, or it can branch when the contents of rs do not equal the immediate value.
blt rs, rt, label # branch on less: Branches to the label when the contents of rs are less than the contents of rt, or it can branch when the contents of rs are less than the immediate value. The comparison treats the comparands as signed 32-bit values.

Unconditional Jump beq Arithmetic Series

Unconditional Jump	`beq`	Arithmetic Series
.text b next li $a0, 1 j put next: li $a0, 2 put: li $v0, 1 syscall	.text li $t0, 0xFF li $t1, -1 beq $t0, $t1, 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: add $a0, $a0, $v0 sub $v0, $v0, 1 j L1 L2: li $v0, 1 syscall
Output	Output	Output
		1+2+3+...+input

       .text 
       b   next
       li  $a0, 1
       j   put 
 next: li  $a0, 2
 put:  li  $v0, 1
       syscall

       .text 
       li   $t0, 0xFF
       li   $t1, -1
       beq  $t0, $t1, 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:  
     add  $a0, $a0, $v0
     sub  $v0, $v0, 1
     j    L1
 L2: li   $v0, 1
     syscall

Output Output Output

1+2+3+...+input