Question

19. (4 points) Convert the following C function (a leaf procedure) to an LEGv8 assembly subroutine. Make sure that you follow the LEGv8 calling conventions. long long int func (long long int a, long long int b) long long int 0: long long int s 0: while (s < b) return k;

Answer 1

19)

Ans)
The Assembly code for the given C function is given below clearly:

Assembly code:

func(long long, long long): ; function name
pushq %rbp
movq %rsp, %rbp
movq %rdi, -24(%rbp)
movq %rsi, -32(%rbp) ;performing instructions
movq $0, -8(%rbp)
movq $0, -16(%rbp)
.L3:
movq -16(%rbp), %rax ;performing instructions
cmpq -32(%rbp), %rax
jge .L2
movq -24(%rbp), %rax
addq %rax, -16(%rbp) ;add instruction executing
addq $1, -8(%rbp)
jmp .L3
.L2:
movq -8(%rbp), %rax
popq %rbp
ret

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