source: liacs/ca/opdr1/myprog.s@ 32

Last change on this file since 32 was 2, checked in by Rick van der Zwet, 15 years ago

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[2]1#/* Author : Rick van der Zwet
2# * S-number : 0433373
3# * Version : $Id: myprog.s 237 2007-09-19 13:19:08Z rick $
4# * Copyright : FreeBSD Licence
5# */
6# space declaration to be used for the printf statement
7 .data
8 .align 4
9space: .asciiz " "
10 .align 4
11# array A reservation 80/4 means a 20 in size
12A: .space 80
13 .align i
14# array B, same size as array A
15B: .space 80
16 .align 4
17# declaration of integer C
18C: .word C
19 .align 4
20# declaration of integer i
21i: .word i
22 .text
23 .align 4
24 .ent main
25main:
26# store the content of 1 into the memory location i
27 li $2,0x00000001 # 1
28 sw $2,i
29$L2:
30# initiation of the first for loop
31 lw $2,i
32# the i<=19 condition check
33 slt $3,$2,20
34# jump to L5 when not done or else exit loop to to L3
35 bne $3,$0,$L5
36 j $L3
37$L5:
38#inner part of loop 1
39 lw $2,i
40#copy the value of $2 -> $3, by using an addition with 0
41 addi $3,$2,0
42#multiple the value of i by 4 to find the offset address
43# where the value in array B will be stored
44 sll $2,$3,2
45#load B (begin array) and add the offset of the array to find the
46#location it needs to be stored
47 la $3,B
48 addu $2,$2,$3
49 addi $3,$2,0
50#store the value of i into the the correct location in the B array
51 lw $2,i
52 sw $2,0($3)
53$L4:
54# raise the value of i by 1 (by using a tmp value) and jump
55# to the begin of the loop
56 lw $3,i
57 addu $2,$3,1
58 move $3,$2
59 sw $3,i
60 j $L2
61$L3:
62# init of C and i (counter for loop)
63 li $2,0x0000002a # 42
64 sw $2,C
65 li $2,0x00000001 # 1
66 sw $2,i
67$L6:
68# inner of loop 2, the for loop condition check, jump to L7 when done
69# else exec L9
70 lw $2,i
71 slt $3,$2,20
72 bne $3,$0,$L9
73 j $L7
74$L9:
75#calculate the offset for array A
76 lw $2,i
77 move $3,$2
78 sll $2,$3,2
79#set the array of storage in A into $2
80 la $4,A
81 addu $3,$2,$4
82 move $2,$3
83#calculate offset of B
84 lw $3,i
85 move $4,$3
86 sll $3,$4,2
87#set initial start to -4 to accomplish i-1
88 la $4,B
89 addi $4,$4,-4
90 addu $3,$3,$4
91 move $4,$3
92#load value of B and C, compare and store in location in array A
93 lw $3,0($4)
94 lw $4,C
95 addu $3,$3,$4
96 sw $3,0($2)
97$L8:
98# same as L4, except the jump goes to L6
99# raise the value of i by 1 (by using a tmp value) and jump
100# to the begin of the loop
101 lw $3,i
102 addu $2,$3,1
103 move $3,$2
104 sw $3,i
105 j $L6
106$L7:
107# the print statements
108 li $v0,1
109 la $3,A
110 lw $a0,76($3)
111 syscall #print A[19]
112
113 li $v0, 4 # system call code for print_str
114 la $a0, space # address of string to print
115 syscall # print the string " "
116
117 li $v0, 1
118 la $3,B
119 lw $a0,76($3)
120 syscall #print B[19]
121
122 li $v0, 4 #
123 la $a0, space #
124 syscall # print the string " "
125
126 li $v0,1
127 la $3,i
128 lw $a0,0($3)
129 syscall #print i
130$L1:
131 .end main
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