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POloop through array mips
 

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    <p>I'm working on a homework assignment that requires me to compute the grayscale value of a series of hex values in an array. That's the part I understand. I need to loop through this array of values until a -1 is encountered. Here's what I've got: </p> <pre><code> # -------------------------------- # Below is the expected output. # # Converting pixels to grayscale: # 0 # 1 # 2 # 34 # 5 # 67 # 89 # Finished. # -- program is finished running -- #--------------------------------- .data 0x0 startString: .asciiz "Converting pixels to grayscale:\n" finishString: .asciiz "Finished." newline: .asciiz "\n" pixels: .word 0x00010000, 0x010101, 0x6, 0x3333, 0x030c, 0x700853, 0x294999, -1 .text 0x3000 main: ori $v0, $0, 4 #System call code 4 for printing a string ori $a0, $0, 0x0 #address of startString is in $a0 syscall #print the string LOOP: ori $a0, $0, 0x0 lw $t1, 48($a0) beq $t1 -1, exit addi $t4, $0, 3 sll $t2, $t1, 8 srl $s1, $t2, 24 #$s1 becomes red value sll $t2, $t1, 16 srl $s2, $t2, 24 #$s2 becomes green value sll $t2, $t1, 24 srl $s3, $t2, 24 #$s3 become blue value add $t1, $s1, $s2 add $t1, $t1, $s3 div $t1, $t4 mflo $s4 #$s4 becomes grayscale value or $a0, $0, $s4 ori $v0, $0, 1 syscall ori $v0, $0, 4 ori $a0, $0, 43 syscall j LOOP exit: ori $v0, $0, 4 #System call code 4 for printing a string ori $a0, $0, 33 #address of finishString is in $a0; we computed this # simply by counting the number of chars in startString, # including the \n and the terminating \0 syscall #print the string ori $v0, $0, 10 #System call code 10 for exit syscall #exit the program </code></pre> <p>I know that 48 needs to be incremented by 4 for every iteration of the loop, I just have no idea how to do this in MIPS. Any help is much appreciated!</p>
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