Question

Can you translate this C code into MIPS assembly with comment?

#include <stdio.h>
#include <math.h>
#include <stdlib.h>

double fact (double);

void
main ()
{
int angle_in_D;
double term, angle_in_R;
float sine = 0;
unsigned int i = 1;
double sign = 1;
int n = 1000;

printf ("Please enter an angle (Unit: Degree): ");
scanf ("%d", &angle_in_D);

angle_in_R = angle_in_D * M_PI / 180.0;
do
{
term = pow(-1,(i-1)) * pow (angle_in_R, (2*i - 1)) / fact (2*i - 1);
sine = sine + term;
i++;
}
while (i <= n);
printf ("The value sine of angle %d is Sin(%d) = %f\n", angle_in_D,
   angle_in_D, sine);

}

double
fact (double x)
{
double fac = 1;
for (double i = 1; i <= x; i++)
{
fac = fac * i;
}
return fac;
}

I coded and tested the C code and seem like it's working well. NOt sure if there's any logical error, but when I tested for popular cases, it's correct

Answer 1

Hello dear student. I have solved your question in both MIPS64 and MIPS simple. You can use whatever you like according to your need. If you have any doubts futher , you can ask in comments.

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1. Here is the code in MIPS64 :-

.LC1:
.ascii "Please enter an angle (Unit: Degree): \000"
.LC2:
.ascii "%d\000"
.LC6:
.ascii "The value sine of angle %d is Sin(%d) = %f\012\000"
main:
daddiu $sp,$sp,-96
sd $31,72($sp)
sd $fp,64($sp)
sd $28,56($sp)
sdc1 $f24,88($sp)
move $fp,$sp
lui $28,%hi(%neg(%gp_rel(main)))
daddu $28,$28,$25
daddiu $28,$28,%lo(%neg(%gp_rel(main)))
sw $0,0($fp)
li $2,1 # 0x1
sw $2,4($fp)
ld $2,%got_page(.LC0)($28)
ldc1 $f0,%got_ofst(.LC0)($2)
sdc1 $f0,8($fp)
li $2,1000 # 0x3e8
sw $2,16($fp)
ld $2,%got_page(.LC1)($28)
daddiu $4,$2,%got_ofst(.LC1)
ld $2,%call16(printf)($28)
move $25,$2
nop

daddiu $2,$fp,40
move $5,$2
ld $2,%got_page(.LC2)($28)
daddiu $4,$2,%got_ofst(.LC2)
ld $2,%call16(__isoc99_scanf)($28)
move $25,$2
nop

lw $2,40($fp)
mtc1 $2,$f0
cvt.d.w $f1,$f0
ld $2,%got_page(.LC3)($28)
ldc1 $f0,%got_ofst(.LC3)($2)
mul.d $f1,$f1,$f0
ld $2,%got_page(.LC4)($28)
ldc1 $f0,%got_ofst(.LC4)($2)
div.d $f0,$f1,$f0
sdc1 $f0,24($fp)
.L2:
lw $2,4($fp)
addiu $2,$2,-1
dext $2,$2,0,32
dmtc1 $2,$f0
cvt.d.l $f1,$f0
ld $2,%got_page(.LC5)($28)
ldc1 $f0,%got_ofst(.LC5)($2)
mov.d $f13,$f1
mov.d $f12,$f0
ld $2,%call16(pow)($28)
move $25,$2
nop

mov.d $f24,$f0
lw $2,4($fp)
sll $2,$2,1
addiu $2,$2,-1
dext $2,$2,0,32
dmtc1 $2,$f0
cvt.d.l $f0,$f0
mov.d $f13,$f0
ldc1 $f12,24($fp)
ld $2,%call16(pow)($28)
move $25,$2
nop

mul.d $f24,$f24,$f0
lw $2,4($fp)
sll $2,$2,1
addiu $2,$2,-1
dext $2,$2,0,32
dmtc1 $2,$f0
cvt.d.l $f0,$f0
mov.d $f12,$f0
ld $2,%got_disp(fact)($28)
move $25,$2
nop

div.d $f0,$f24,$f0
sdc1 $f0,32($fp)
lwc1 $f0,0($fp)
cvt.d.s $f1,$f0
ldc1 $f0,32($fp)
add.d $f0,$f1,$f0
cvt.s.d $f0,$f0
swc1 $f0,0($fp)
lw $2,4($fp)
addiu $2,$2,1
sw $2,4($fp)
lw $2,16($fp)
lw $3,4($fp)
sltu $2,$2,$3
beq $2,$0,.L2
nop

lw $2,40($fp)
lw $3,40($fp)
lwc1 $f0,0($fp)
cvt.d.s $f0,$f0
dmfc1 $7,$f0
move $6,$3
move $5,$2
ld $2,%got_page(.LC6)($28)
daddiu $4,$2,%got_ofst(.LC6)
ld $2,%call16(printf)($28)
move $25,$2
nop

nop
move $sp,$fp
ld $31,72($sp)
ld $fp,64($sp)
ld $28,56($sp)
ldc1 $f24,88($sp)
daddiu $sp,$sp,96
j $31
nop

fact:
daddiu $sp,$sp,-48
sd $fp,40($sp)
move $fp,$sp
lui $3,%hi(%neg(%gp_rel(fact)))
daddu $3,$3,$25
daddiu $3,$3,%lo(%neg(%gp_rel(fact)))
sdc1 $f12,16($fp)
ld $2,%got_page(.LC0)($3)
ldc1 $f0,%got_ofst(.LC0)($2)
sdc1 $f0,0($fp)
ld $2,%got_page(.LC0)($3)
ldc1 $f0,%got_ofst(.LC0)($2)
sdc1 $f0,8($fp)
b .L4
nop

.L5:
ldc1 $f1,0($fp)
ldc1 $f0,8($fp)
mul.d $f0,$f1,$f0
sdc1 $f0,0($fp)
ldc1 $f1,8($fp)
ld $2,%got_page(.LC0)($3)
ldc1 $f0,%got_ofst(.LC0)($2)
add.d $f0,$f1,$f0
sdc1 $f0,8($fp)
.L4:
ldc1 $f1,8($fp)
ldc1 $f0,16($fp)
c.le.d $fcc0,$f1,$f0
bc1t $fcc0,.L5
nop

ldc1 $f0,0($fp)
move $sp,$fp
ld $fp,40($sp)
daddiu $sp,$sp,48
j $31
nop

.LC0:
.word 0
.word 1072693248
.LC3:
.word 1413754136
.word 1074340347
.LC4:
.word 0
.word 1080459264
.LC5:
.word 0
.word -1074790400

2. Here is your code in early simple MIPS :-

$LC1:
.ascii "Please enter an angle (Unit: Degree): \000"
$LC2:
.ascii "%d\000"
$LC7:
.ascii "The value sine of angle %d is Sin(%d) = %f\012\000"
main:
addiu $sp,$sp,-96
sw $31,84($sp)
sw $fp,80($sp)
swc1 $f20,92($sp)
swc1 $f21,88($sp)
move $fp,$sp
sw $0,32($fp)
li $2,1 # 0x1
sw $2,36($fp)
lui $2,%hi($LC0)
lwc1 $f0,%lo($LC0+4)($2)
nop
lwc1 $f1,%lo($LC0)($2)
nop
swc1 $f0,44($fp)
swc1 $f1,40($fp)
li $2,1000 # 0x3e8
sw $2,48($fp)
lui $2,%hi($LC1)
addiu $4,$2,%lo($LC1)
jal printf
nop

addiu $2,$fp,72
move $5,$2
lui $2,%hi($LC2)
addiu $4,$2,%lo($LC2)
jal __isoc99_scanf
nop

lw $2,72($fp)
nop
mtc1 $2,$f0
nop
cvt.d.w $f2,$f0
lui $2,%hi($LC3)
lwc1 $f0,%lo($LC3+4)($2)
nop
lwc1 $f1,%lo($LC3)($2)
nop
mul.d $f2,$f2,$f0
lui $2,%hi($LC4)
lwc1 $f0,%lo($LC4+4)($2)
nop
lwc1 $f1,%lo($LC4)($2)
nop
div.d $f0,$f2,$f0
swc1 $f0,60($fp)
swc1 $f1,56($fp)
$L5:
lw $2,36($fp)
nop
addiu $2,$2,-1
mtc1 $2,$f0
nop
cvt.d.w $f0,$f0
bgez $2,$L2
nop

lui $2,%hi($LC5)
lwc1 $f2,%lo($LC5+4)($2)
nop
lwc1 $f3,%lo($LC5)($2)
nop
add.d $f0,$f0,$f2
$L2:
lui $2,%hi($LC6)
lwc1 $f2,%lo($LC6+4)($2)
nop
lwc1 $f3,%lo($LC6)($2)
mov.d $f14,$f0
mov.d $f12,$f2
jal pow
nop

mov.d $f20,$f0
lw $2,36($fp)
nop
sll $2,$2,1
addiu $2,$2,-1
mtc1 $2,$f0
nop
cvt.d.w $f0,$f0
bgez $2,$L3
nop

lui $2,%hi($LC5)
lwc1 $f2,%lo($LC5+4)($2)
nop
lwc1 $f3,%lo($LC5)($2)
nop
add.d $f0,$f0,$f2
$L3:
mov.d $f14,$f0
lwc1 $f12,60($fp)
nop
lwc1 $f13,56($fp)
jal pow
nop

mul.d $f20,$f20,$f0
lw $2,36($fp)
nop
sll $2,$2,1
addiu $2,$2,-1
mtc1 $2,$f0
nop
cvt.d.w $f0,$f0
bgez $2,$L4
nop

lui $2,%hi($LC5)
lwc1 $f2,%lo($LC5+4)($2)
nop
lwc1 $f3,%lo($LC5)($2)
nop
add.d $f0,$f0,$f2
$L4:
mov.d $f12,$f0
jal fact
nop

div.d $f0,$f20,$f0
swc1 $f0,68($fp)
swc1 $f1,64($fp)
lwc1 $f0,32($fp)
nop
cvt.d.s $f2,$f0
lwc1 $f0,68($fp)
nop
lwc1 $f1,64($fp)
nop
add.d $f0,$f2,$f0
cvt.s.d $f0,$f0
swc1 $f0,32($fp)
lw $2,36($fp)
nop
addiu $2,$2,1
sw $2,36($fp)
lw $2,48($fp)
lw $3,36($fp)
nop
sltu $2,$2,$3
beq $2,$0,$L5
nop

lw $2,72($fp)
lw $3,72($fp)
lwc1 $f0,32($fp)
nop
cvt.d.s $f0,$f0
swc1 $f0,20($sp)
swc1 $f1,16($sp)
move $6,$3
move $5,$2
lui $2,%hi($LC7)
addiu $4,$2,%lo($LC7)
jal printf
nop

nop
move $sp,$fp
lw $31,84($sp)
lw $fp,80($sp)
lwc1 $f20,92($sp)
nop
lwc1 $f21,88($sp)
addiu $sp,$sp,96
j $31
nop

fact:
addiu $sp,$sp,-32
sw $fp,28($sp)
move $fp,$sp
swc1 $f12,36($fp)
swc1 $f13,32($fp)
lui $2,%hi($LC0)
lwc1 $f0,%lo($LC0+4)($2)
nop
lwc1 $f1,%lo($LC0)($2)
nop
swc1 $f0,12($fp)
swc1 $f1,8($fp)
lui $2,%hi($LC0)
lwc1 $f0,%lo($LC0+4)($2)
nop
lwc1 $f1,%lo($LC0)($2)
nop
swc1 $f0,20($fp)
swc1 $f1,16($fp)
b $L7
nop

$L8:
lwc1 $f2,12($fp)
nop
lwc1 $f3,8($fp)
lwc1 $f0,20($fp)
nop
lwc1 $f1,16($fp)
nop
mul.d $f0,$f2,$f0
swc1 $f0,12($fp)
swc1 $f1,8($fp)
lwc1 $f2,20($fp)
nop
lwc1 $f3,16($fp)
lui $2,%hi($LC0)
lwc1 $f0,%lo($LC0+4)($2)
nop
lwc1 $f1,%lo($LC0)($2)
nop
add.d $f0,$f2,$f0
swc1 $f0,20($fp)
swc1 $f1,16($fp)
$L7:
lwc1 $f2,20($fp)
nop
lwc1 $f3,16($fp)
lwc1 $f0,36($fp)
nop
lwc1 $f1,32($fp)
nop
c.le.d $f2,$f0
nop
bc1t $L8
nop

lwc1 $f0,12($fp)
nop
lwc1 $f1,8($fp)
move $sp,$fp
lw $fp,28($sp)
addiu $sp,$sp,32
j $31
nop

$LC0:
.word 1072693248
.word 0
$LC3:
.word 1074340347
.word 1413754136
$LC4:
.word 1080459264
.word 0
$LC5:
.word 1106247680
.word 0
$LC6:
.word -1074790400
.word 0

Thankyou!