Fibonacci numbers in RISC-V 64

fib-riscv64.s

.section .data
fibs: .double 0,0,0,0,0,0,0,0,0,0,0,0
size: .word 12
space: .string " "
head: .string "The Fibonacci numbers are:\n"
printf_str: .string "%d\n"

.section .text
.global main
main:
    la s0, fibs # load address of fib
    la s5, size # load address of size of fibs
    lw s5, 0(s5) # load size of fibs
    li s2, 1 # load 1 as first number of fib
    sd s2, 0(s0) # set 1 fib number as 1
    sd s2, 8(s0) # set 2 fib number as 1
    addi s1, s5, -2 # loop over size - 2
loop:
    ld s3, 0(s0) # load N-2 number
    ld s4, 8(s0) # load N-1 number
    add s2, s3, s4 # calculate N
    sd s2, 16(s0) #store N number
    addi s0, s0, 8 # move pointer to the next number
    addi s1, s1, -1 # decrement loop
    bgtz s1, loop # loop
    call print
    j exit

print:
    mv s11, ra
    la s0, fibs
    la s1, size
    lw s1, 0(s1)
    la a0, head
    call printf
out:
    la a0, printf_str
    ld a1, 0(s0)
    call printf
    addi s0, s0, 8
    addi s1, s1, -1
    bgt s1, zero, out
    jr s11

exit:
    li a7, 93
    li a0, 0
    ecall

Makefile

default:
	gcc -o fib fib.s -static

clean:
	rm -rf fib