MIPS Assembly Language Programming

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5.3. MULTIPLES.ASM 73 39 b loop # iterate. 40 endloop: 41 la $a0, newline # print a newline: 42 li $v0, 4 # syscall 4 = print_string 43 syscall 44 45 exit: # exit the program: 46 li $v0, 10 # syscall 10 = exit 47 syscall # we’re outta here. 48 49 ## Here’s where the data for this program is stored: 50 .data 51 space: .asciiz " " 52 newline: .asciiz "\n" 53 54 ## end of multiples.asm
74 CHAPTER 5. <strong>MIPS</strong> ASSEMBLY CODE EXAMPLES 5.4 palindrome.asm This program is described in section 2.8. The algorithm used is algorithm 2.2 (shown on page 34). 1 ## Daniel J. Ellard -- 02/21/94 2 ## palindrome.asm -- read a line of text and test if it is a palindrome. 3 ## Register usage: 4 ## $t1 - A. 5 ## $t2 - B. 6 ## $t3 - the character at address A. 7 ## $t4 - the character at address B. 8 ## $v0 - syscall parameter / return values. 9 ## $a0 - syscall parameters. 10 ## $a1 - syscall parameters. 11 12 .text 13 main: # SPIM starts by jumping to main. 14 ## read the string S: 15 la $a0, string_space 16 li $a1, 1024 17 li $v0, 8 # load "read_string" code into $v0. 18 syscall 19 20 la $t1, string_space # A = S. 21 22 la $t2, string_space ## we need to move B to the end 23 length_loop: # of the string: 24 lb $t3, ($t2) # load the byte at addr B into $t3. 25 beqz $t3, end_length_loop # if $t3 == 0, branch out of loop. 26 addu $t2, $t2, 1 # otherwise, increment B, 27 b length_loop # and repeat the loop. 28 end_length_loop: 29 subu $t2, $t2, 2 ## subtract 2 to move B back past 30 # the ’\0’ and ’\n’. 31 test_loop: 32 bge $t1, $t2, is_palin # if A >= B, it’s a palindrome. 33 34 lb $t3, ($t1) # load the byte at addr A into $t3, 35 lb $t4, ($t2) # load the byte at addr B into $t4. 36 bne $t3, $t4, not_palin # if $t3 != $t4, not a palindrome. 37 # Otherwise, 38 addu $t1, $t1, 1 # increment A,
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