assembly - MIPS Quicksort program showing Exception 4 [Address Error in inst/data fetch ] -


i learning mips . tried write program on quicksort (without recursion). wrote following code . takes sorted array number of elements , number search input , returns array index of number ,

.data     .align 2     myarray: .space 4000    #1000 elements atmost prompt1: .asciiz "enter n : " prompt2: .asciiz " " prompt3: .asciiz "\nenter sorted array: " prompt4: .asciiz "enter number sorted"  .text  main:     li $v0, 4     la $a0, prompt1     syscall      li $v0, 5     syscall       move $s1, $v0,    #n     addi $s0, $s1, -1       li $v0, 4     la $a0, prompt4     syscall      li $v0, 5     syscall              move $s2, $v0    #stores k ,  number searched   addi $t0, $zero, 0        #clear values in $t0       li $v0, 4     la $a0, prompt3     syscall  input:       li $v0, 5           # reading inputs     syscall      add $t1, $t0, $zero       add $t3, $v0, $zero      sll $t1, $t0, 2      sw $t3, myarray($t1)     addi $t0, $t0, 1         slt $t1, $s0, $t0      beq $t1, $zero, input       addi $t0, $zero, 0  # $t0 stores left     sll $t1, $s0, 2     #t1 stores right         add $t2, $t1, $t0        srl $t2, $t2, 1     # $t2 stores mid       binsearch:      bge $t0, $t1 , exit       lw $t6, myarray($t2)        #showing error here      blt $t6, $s2, leftindex      # if(a[mid]<k) goto left      beq $t6, $s2, found      bgt $t6, $t2, rightindex       leftindex:     addi    $t0, $t2, 1     # left index leftindex= mid + 1     add $t2, $t1, $t0       # mid = left + right      srl $t2, $t2, 1         # mid/2     j binsearch             #goback binary search       found:     li $v0, 1               #if(a[leftindex]==k)     addi $a0, $t0, 0        #print index of k     syscall     j exit                  #exit programme      rightindex:                  addi $t1, $t2, -1   #rightindex = mid -1     add $t2, $t1, $t0   #mid = left+right     srl $t2, $t2, 1     #mid/2      j binsearch         #goback binarysearch       exit:      li $v0, 10     syscall

it giving me error : exception 4 [adderess error in inst/data fetch ]

it giving me error in line 70-72 

    lw $t6, myarray($t2)      blt $t6, $s2, leftindex

i have mentioned line comment in code also

please tell me doing wrong .


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