$29
Project 3 Solution
Description
For project three, your objective is to convert the given C++ code into MIPS assembly. Please do not modify the C++ code itself. You are only allowed to make modi cations to the assembly le. Start writing your code below the main: label and above the exit: label. For this project stay BETWEEN these labels.
When doing a C++ to MIPS conversion, the conversion can be done in the following steps:
Assign variables to registers. When inspecting code, any constant values in if-statements or expressions may need to be assigned to temporary registers.
Initialize variables to registers. (actually put the values into the registers.)
3 Then move onto the rest of the code.
Before you begin, please make sure you click the link on ilearn to create your GitHub repo.
After created please clone this repo with the git clone repo url command.
Expected Output:
Value of a: 25
Value of b: 31
Value of c: 18
Value of d: 49
Submission
When you have completed the assignment please commit all work done to your private repository. This can be done with the following commands:
git add .
git commit -m "some message"
git push
1
Base MIPS Code
1
. data
"nn"
2
e n d l :
. a s c i i z
#
used
f o r
c o u t << e n d l ;
3
a l b l :
. a s c i i z
"Value
o f
a :
"
#
l a b e l
f o r
a
4
b l b l :
. a s c i i z
"Value
o f
b :
"
#
l a b e l
f o r
b
5
c l b l :
. a s c i i z
"Value
o f
c :
"
#
l a b e l
f o r
c
6
d l b l :
. a s c i i z
"Value
o f
d :
"
#
l a b e l
f o r
d
7
. t e x t
8
9
# a
$ s 0
10
# b
$ s 1
11
# c
$ s 2
12
# d
$ s 3
13
main :
14
15
16
e x i t :
17
l a
$a0 , a l b l
# p u t s a l b l i n t o a r g 0 ( a0 r e g i s t e r ) f o r c o u t
18
a d d i
$v0 , $0 ,
4
# p u t s 4
i n
v0
which d e n o t e s
we
a r e
p r i n t i n g
a
s t r i n g
19
s y s c a l l
# make a
s y s c a l l
t o
system
20
21
move
$a0 , $ s 0
# p u t s a
i n t o
a r g 0
( a0 r e g i s t e r )
f o r
c o u t
22
a d d i $v0 , $0 , 1
# p u t s 1 i n v0 t o d e n o t e we a r e p r i n t i n g an i n t
23
s y s c a l l
# make a
s y s c a l l
t o
system
24
25
l a
$a0 , e n d l
# p u t s t h e a d d r e s s o f t h e s t r i n g e n d l i n t o a0
26
a d d i $v0 , $0 , 4
# p u t s 4 i n t o v0 s a y i n g we a r e p r i n t i n g a s t r i n g
27
s y s c a l l
28
29
l a
$a0 , b l b l
# p u t s b l b l i n t o a r g 0 ( a0 r e g i s t e r ) f o r c o u t
30
a d d i
$v0 , $0 ,
4
# p u t s 4
i n
v0
which d e n o t e s
we
a r e
p r i n t i n g
an
s t r i n g
31
s y s c a l l
# make a
s y s c a l l
t o
system
32
33
move
$a0 , $ s 1
# p u t s b
i n t o
a r g 0
( a0 r e g i s t e r )
f o r
c o u t
34
a d d i $v0 , $0 , 1
# p u t s 1 i n v0 t o d e n o t e we a r e p r i n t i n g an i n t
35
s y s c a l l
# make a
s y s c a l l
t o
system
36
37
l a
$a0 , e n d l
# p u t s t h e a d d r e s s o f t h e s t r i n g e n d l i n t o a0
38
a d d i $v0 , $0 , 4
# p u t s 4 i n t o v0 s a y i n g we a r e p r i n t i n g a s t r i n g
39
s y s c a l l
40
41
l a
$a0 , c l b l
# p u t s c l b l i n t o a r g 0 ( a0 r e g i s t e r ) f o r c o u t
42
a d d i
$v0 , $0 ,
4
# p u t s 4
i n
v0
which d e n o t e s
we
a r e
p r i n t i n g
a
s t r i n g
43
s y s c a l l
# make a
s y s c a l l
t o
system
44
45
move
$a0 , $ s 2
# p u t s c
i n t o
a r g 0
( a0 r e g i s t e r )
f o r
c o u t
46
a d d i $v0 , $0 , 1
# p u t s 1 i n v0 t o d e n o t e we a r e p r i n t i n g an i n t
47
s y s c a l l
# make a
s y s c a l l
t o
system
48
49
l a
$a0 , e n d l
# p u t s t h e a d d r e s s o f t h e s t r i n g e n d l i n t o a0
2
50
a d d i
$v0 , $0 , 4
# p u t s 4 i n t o v0 s a y i n g we a r e p r i n t i n g a s t r i n g
51
s y s c a l l
52
53
l a
$a0 , d l b l
# p u t s d l b l i n t o a r g 0 ( a0 r e g i s t e r ) f o r c o u t
54
a d d i
$v0 , $0 , 4
# p u t s 4
i n v0
which d e n o t e s we
a r e
p r i n t i n g a s t r i n g
55
s y s c a l l
# make
a
s y s c a l l
t o
system
56
57
move
$a0 , $ s 3
# p u t s
d i n t o
a r g 0
( a0 r e g i s t e r )
f o r
c o u t
58
a d d i
$v0 , $0 , 1
# p u t s 1 i n v0 t o d e n o t e we a r e p r i n t i n g an i n t
59
s y s c a l l
# make
a
s y s c a l l
t o
system
60
61
l a
$a0 , e n d l
# p u t s t h e a d d r e s s o f t h e s t r i n g e n d l i n t o a0
62
a d d i
$v0 , $0 , 4
# p u t s 4
i n t o v0 s a y i n g we a r e p r i n t i n g a s t r i n g
63
s y s c a l l
64
65
a d d i
$v0 , $0 , 10
66
s y s c a l l
p3codeBase.s
3
C++ Equivalent
#i n c l u d e <i o s t r e a m
2
3 u s i n g namespace s t d ;
4
5
6
7 i n t main ( v o i d )
f
9
10
i n t
a
=
5 ;
11
i n t
b
=
6 ;
12
i n t
c
=
7 ;
13
i n t
d ;
14
15
d =
1;
16
( a < 1 0 ) f
17
i f
18
a++;
19
g e l s e f
a ;
21
g
22
23
d = a + c ;
24
c = a + d ;
25
< 10 ) f
26
i f ( b
27
b++;
28
c
;
29
g e l s e f
30
b
;
31
c++;
g
33
34
a =
c
+ b ;
35
b =
c
+ d ;
36
i f ( b < c && b a ) f
37
d = a + b ;
39
g e l s e i f ( b c j j c < a ) f
40
d = b + c ;
41
g
42
43
c o u t << "Value o f a : " << a << e n d l ;
c o u t << "Value o f b : " << b << e n d l ;
45
c o u t << "Value
o f
c :
" << c << e n d l ;
46
c o u t << "Value
o f
d :
" << d << e n d l ;
47
r e t u r n 0 ;
48
g
4
p3code.cpp
5
