Question

Write ARMv8 Assembly code and C++ code for a function called int grade(int n) that returns...

Write ARMv8 Assembly code and C++ code for a function called int grade(int n) that returns the character 'A' if n >= 90, 'B' if 90 > n >= 80, etc. (Use the ASCII code.)

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Homework Answers

Answer #1

C++ Code:

int grade(int n){
if(n>=90)
return 65
else if(n<90 && n>=80)
return 66
else if(n<80 && n>=70)
return 67
else if(n<70 && n>=60)
return 68
else if(n<60 && n>=50)
return 69
else
return 70
}

ARMv8 code:

grade(int):

sub sp, sp, #16

str w0, [sp, 12]

ldr w0, [sp, 12]

cmp w0, 89

ble .L2

mov w0, 65

b .L3

.L2:

ldr w0, [sp, 12]

cmp w0, 89

bgt .L4

ldr w0, [sp, 12]

cmp w0, 79

ble .L4

mov w0, 66

b .L3

.L4:

ldr w0, [sp, 12]

cmp w0, 79

bgt .L5

ldr w0, [sp, 12]

cmp w0, 69

ble .L5

mov w0, 67

b .L3

.L5:

ldr w0, [sp, 12]

cmp w0, 69

bgt .L6

ldr w0, [sp, 12]

cmp w0, 59

ble .L6

mov w0, 68

b .L3

.L6:

ldr w0, [sp, 12]

cmp w0, 59

bgt .L7

ldr w0, [sp, 12]

cmp w0, 49

ble .L7

mov w0, 69

b .L3

.L7:

mov w0, 70

.L3:

add sp, sp, 16

ret

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