-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathfactorial.s
executable file
·85 lines (85 loc) · 2.07 KB
/
factorial.s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
mul:
addi sp, sp, -32
sw ra, 28(sp)
sw s0, 24(sp)
addi s0, sp, 32
sw a0, -12(s0)
sw a1, -16(s0)
mv a0, zero
sw a0, -20(s0)
sw a0, -24(s0)
j .LBB0_1
.LBB0_1:
lw a0, -24(s0)
lw a1, -16(s0)
bge a0, a1, .LBB0_4
j .LBB0_2
.LBB0_2:
lw a0, -20(s0)
lw a1, -12(s0)
add a0, a0, a1
sw a0, -20(s0)
j .LBB0_3
.LBB0_3:
lw a0, -24(s0)
addi a0, a0, 1
sw a0, -24(s0)
j .LBB0_1
.LBB0_4:
lw a0, -20(s0)
lw s0, 24(sp)
lw ra, 28(sp)
addi sp, sp, 32
ret
factorial:
addi sp, sp, -32
sw ra, 28(sp)
sw s0, 24(sp)
addi s0, sp, 32
sw a0, -12(s0)
addi a0, zero, 1
sw a0, -16(s0)
sw a0, -20(s0)
j .LBB1_1
.LBB1_1:
lw a0, -20(s0)
lw a1, -12(s0)
# Check if we reached to value 1 at operand 2 , then exit
blt a1, a0, .LBB1_4
j .LBB1_2
.LBB1_2:
lw a0, -16(s0)
lw a1, -20(s0)
# calls multiply api with input value and (input -1) value .
call mul
sw a0, -16(s0)
j .LBB1_3
.LBB1_3:
lw a0, -20(s0)
addi a0, a0, 1
sw a0, -20(s0)
j .LBB1_1
.LBB1_4:
lw a0, -16(s0)
lw s0, 24(sp)
lw ra, 28(sp)
addi sp, sp, 32
ret
main:
addi sp, sp, -32
sw ra, 28(sp)
sw s0, 24(sp)
addi s0, sp, 32
mv a0, zero
sw a0, -12(s0)
#operand for factorial calculation
addi a1, zero, 12
sw a0, -20(s0)
add a0, zero, a1
call factorial
#output value
sw a0, -16(s0)
lw s0, 24(sp)
lw ra, 28(sp)
addi sp, sp, 32
ret