Databases
StackOverflow2013
Postsdbo
POWhat is wrong with my MIPS code (arrays)?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POWhat is wrong with my MIPS code (arrays)?
    primarykey
    data
    text
    <p>Well I have to convert </p> <pre><code># j = 0 # x = a[j+k] # a[j+k] = a[j] # repeat n-1 times # j = (j+k) mod n # m = (j+k) mod n # y = a[m] # a[m] = x # x = y # end repeat </code></pre> <p>to MIPS code. So far, I've come up with this but it prints out incorrect output. Any help?</p> <pre><code> .data .align 2 head1: .asciiz "\n\nThis program reads a list of integers into an array, and then" head2: .asciiz "\nshifts the array to the right with wrap around." head3: .asciiz "\nThe list is terminated by a negative integer." prompt1: .asciiz "\nEnter the shift amount first: " prompt2: .asciiz "\nEnter array numbers (negative to end)" newline: .asciiz "\n" .text .globl main main: # print the prompt messages See appendix B of P&amp;H or chapter 4 of Britton li $v0, 4 # $v0 = print_string system call code la $a0, head1 # $a0 = address of first prompt syscall # print first prompt li $v0, 4 # $v0 = print_string system call code la $a0, head2 # $a0 = address of second prompt syscall # print second prompt li $v0, 4 # $v0 = print_string system call code la $a0, head3 # $a0 = address of third prompt syscall # print third prompt # Main program - calls read, rearrange and print functions li $v0, 4 # $v0 = print_string system call code la $a0, prompt1 # $a0 = address of fourth prompt syscall # print fourth prompt li $v0, 5 # $v0 = read_int system call code syscall # read an integer - n move $a2, $v0 # $a2 = separation point for rearranging array li $v0, 4 # $v0 = print_string system call code la $a0, prompt2 # $a0 = address of fifth prompt syscall # print fifth prompt li $a0, 0x10000000 # $a0 = base address of array = 10000000 (hex) jal reada # read numbers into array move $a1, $v0 # $a1 = number of ints read - size of array jal shift # shift the array to the right jal printa # print numbers from array to screen # Call system exit li $v0, 10 # $v0 = exit system call code syscall # halt program execution # Algorithm for reading numbers into an array reada: move $t0, $a0 # $t0 = base address of array move $t1, $zero # $t1 = counter = 0 read: li $v0, 5 # $v0 = read_int system call code syscall # read an integer - n slt $t2, $v0, $zero # if n &lt; 0 then stop reading bne $t2, $zero, exit # exit procedure and return to caller sw $v0, 0($t0) # a[i] = n addi $t1, $t1, 1 # i = i + 1 addi $t0, $t0, 4 # $t0 = address of a[i + 1] j read # go back up and read another integer exit: move $v0, $t1 # return number of integers read into array jr $ra # return to calling routine # Algorithm for printing numbers from an array printa: move $t0, $a0 # $t0 = base address of array move $t1, $zero # $t1 = counter = 0 print: beq $t1, $a1, exitp # if (array index = array size), then exit lw $t2, 0($t0) # $t2 = a[i] li $v0, 4 # $v0 = print_string system call code la $a0, newline # $a0 = address of newline character syscall # print new line li $v0, 1 # $v0 = print_int system call code move $a0, $t2 # $a0 = a[i] syscall # print a[i] addi $t1, $t1, 1 # i = i + 1 addi $t0, $t0, 4 # $t0 = address of a[i + 1] j print # go back up and print another integer exitp: li $v0, 4 # $v0 = print_string system call code la $a0, newline # $a0 = address of newline character syscall # print new line jr $ra # Algorithm for rearranging array # j = 0 # x = a[j+k] # a[j+k] = a[j] # repeat n-1 times # j = (j+k) mod n # m = (j+k) mod n # y = a[m] # a[m] = x # x = y # end repeat # Register usage # $a0 = base address of array # $a1 = n, size of array # $a2 = k, the shift amount shift: li $t3, 0 #j = 0 lw $t3, 0($a0) #load the value of $a0 in to j add $t3, $t3, $a2 # j = j+k sw $t3, 4($a0) # store the new value of j in to $a0 repeat: beq $a1, $zero, end sub $a1, $a1, 1 #n = n-1 add $t4, $t3, $a2 #j+k div $t4, $a1 #divide (j+k) by n mfhi $t5 move $t5, $t3 #j = (j+k) mod n add $t4, $t5, $a2 #j+k div $t4, $a1 #divide (j+k) by n mfhi $t5 #move rem into t2 move $t5, $t3 #m = (j+k) mod n sw $t3, 4($a0) jr $ra lw $t3, 0($a0) b repeat end: </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USwazy
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POWhat is wrong with my MIPS code (arrays)?
      1. This table or related slice is empty.
      1. VTDownMod
    2. VO
      singulars
      1. POWhat is wrong with my MIPS code (arrays)?
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload