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Analysis of Function f1 in MIPS Assembly Language

This document provides an in-depth analysis of the MIPS assembly function `f1`, which operates on three arrays, A, B, and C. The function iterates through the elements of these arrays and finds the first index `i` where the condition `A[i] - B[i] < C[i]` holds true, returning this index in register `$v0`. The code and logic of the function are thoroughly explained, helping to understand array manipulation and comparison in MIPS. It is crucial for beginners in assembly language seeking to grasp looping and condition checking.

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Analysis of Function f1 in MIPS Assembly Language

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  1. CDA 3100 Recitation Week 15

  2. What does the function f1 do: .data A: .word 10,21,45,8,100,15,29,12,3,19 B: .word 2,5,33,5,20,1,53,52,5,5 C: .word 6,8,5,4,5,22,53,12,33,89 .text .globl main main: la $a0, A la $a1, B la $a2, C li $a3, 10 jalf1 li $v0,10 #exit syscall f1: li $v0, -1 ble $a3, $0, L3 li $t7, 0 L1: lw $t0, 0($a0) lw $t1, 0($a1) lw $t2, 0($a2) sub $t0, $t0, $t1 blt $t0, $t2, L2 addi $a0, $a0, 4 addi $a1, $a1, 4 addi $a2, $a2, 4 addi $t7, $t7, 1 blt $t7, $a3, L1 j L3 L2: addi $v0,$t7,0 L3: jr $ra

  3. What does the function f1 do: .data A: .word 10,21,45,8,100,15,29,12,3,19 B: .word 2,5,33,5,20,1,53,52,5,5 C: .word 6,8,5,4,5,22,53,12,33,89 .text .globl main main: la $a0, A la $a1, B la $a2, C li $a3, 10 jalf1 li $v0,10 #exit syscall f1: li $v0, -1 ble $a3, $0, L3 li $t7, 0 L1: lw $t0, 0($a0) lw $t1, 0($a1) lw $t2, 0($a2) sub $t0, $t0, $t1 blt $t0, $t2, L2 addi $a0, $a0, 4 addi $a1, $a1, 4 addi $a2, $a2, 4 addi $t7, $t7, 1 blt $t7, $a3, L1 j L3 L2: addi $v0,$t7,0 L3: jr $ra It finds the first i such that A[i] – B[i] < C[i]

  4. What does f1 return in $v0: .data A: .word 10,21,45,8,100,15,29,12,3,19 B: .word 2,5,33,5,20,1,53,52,5,5 C: .word 6,8,5,4,5,22,53,12,33,89 .text .globl main main: la $a0, A la $a1, B la $a2, C li $a3, 10 jalf1 li $v0,10 #exit syscall f1: li $v0, -1 ble $a3, $0, L3 li $t7, 0 L1: lw $t0, 0($a0) lw $t1, 0($a1) lw $t2, 0($a2) sub $t0, $t0, $t1 blt $t0, $t2, L2 addi $a0, $a0, 4 addi $a1, $a1, 4 addi $a2, $a2, 4 addi $t7, $t7, 1 blt $t7, $a3, L1 j L3 L2: addi $v0,$t7,0 L3: jr $ra

  5. What does f1 return in $v0: .data A: .word 10,21,45,8,100,15,29,12,3,19 B: .word 2,5,33,5,20,1,53,52,5,5 C: .word 6,8,5,4,5,22,53,12,33,89 .text .globl main main: la $a0, A la $a1, B la $a2, C li $a3, 10 jalf1 li $v0,10 #exit syscall f1: li $v0, -1 ble $a3, $0, L3 li $t7, 0 L1: lw $t0, 0($a0) lw $t1, 0($a1) lw $t2, 0($a2) sub $t0, $t0, $t1 blt $t0, $t2, L2 addi $a0, $a0, 4 addi $a1, $a1, 4 addi $a2, $a2, 4 addi $t7, $t7, 1 blt $t7, $a3, L1 j L3 L2: addi $v0,$t7,0 L3: jr $ra 3

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