MIPS Assembly Language Programming

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2.7. LOOPING: THE MULTIPLES PROGRAM 31 ## put the larger of $t0 and $t1 into $t2. bgt $t0, $t1, t0_bigger # If $t0 > $t1, branch to t0_bigger, move $t2, $t1 # otherwise, copy $t1 into $t2. b endif # and then branch to endif t0_bigger: move $t2, $t0 # copy $t0 into $t2 endif: ## Print out $t2. move $a0, $t2 # move the number to print into $a0. li $v0, 1 # load syscall print_int into $v0. syscall # make the syscall. ## exit the program. li $v0, 10 # syscall code 10 is for exit. syscall # make the syscall. # end of larger.asm. 2.7 Looping: the multiples Program The next program that we will write will read two numbers A and B, and print out multiples of A from A to A × B. The algorithm that our program will use is given in algorithm 2.1. This algorithm translates easily into <strong>MIPS</strong> assembly. Since we already know how to read in numbers and print them out, we won’t bother to implement these steps here– we’ll just leave these as comments for now. # Daniel J. Ellard -- 02/21/94 # multiples.asm-- takes two numbers A and B, and prints out # all the multiples of A from A to A * B. # If B
32 CHAPTER 2. <strong>MIPS</strong> TUTORIAL Algorithm 2.1 The multiples program. 1. Get A from the user. 2. Get B from the user. If B ≤ 0, terminate. 3. Set sentinel value S = A × B. 4. Set multiple m = A. 5. Loop: (a) Print m. (b) If m == S, then go to the next step. (c) Otherwise, set m = m + A, and then repeat the loop. 6. Terminate.
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