The following code must be converted to MIPS using a jump address table. Asume t

Question

The following code must be converted to MIPS using a jump address table. Asume the 6 variables are contained in registers $s0 to $s5 and that register $t2 contains 4. Variable K needs to be asked to the user:

--------------------------------------------------------------------------------------------------------------------------------------------------------

CODE: switch (k) {

case 0: f = i + j; break ; /* k = 0*/

case 1: f = g + h; break ; /* k = 1*/

case 2: f = g - h; break ; /* k = 2*/

case 3: f = i - j; break ; /* k = 3*/

}

-----------------------------------------------------------------------------------------------------------------------------------------------------------

Explanation / Answer

Solution:

The MIPS implementation of the statements are given below:

code:

Slt $t3,$s5,$zero       # checking the condition if k<0
bne $t3,$zero,Exit    # jump to exit if k<0
slt $t3,$s5,$t2    # check if k<4
beq $t3,$zero,Exit   # kump to exit if k>=4
add $t1,$s5,$s5       # $t1 =2*k
add $t1,$t1,$t1       #$t1 =4*k
add $t1,$t1,$t4       #$t1= this is the address of the JumpTable[k]
lw $t0,0($t1)          #$to=JumpTable[k]
jr $t0                  #jump based on register $t0
L0:   add $s0,$s3,$s4
   j Exit
L1:   add $s0,$s1,$s2
   j Exit
L2:   sub $s0,$s1,$s2
   j Exit
L3:   sub $s0,$s3,$s4
Exit:?

I hope this helps if you find any problem. Please comment below. Don't forget to give a thumbs up if you liked it. :)

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.