.intel_syntax noprefix
.section .text

# func nub_memcpy(destination: ^u8, source: ^u8, count: u64): ^u8
.global nub_memcpy
nub_memcpy:
    push rdi
    mov rcx, rdx
    test rcx, rcx
    jz memcpy_done
memcpy_loop:
    mov al, BYTE PTR [rsi]
    mov BYTE PTR [rdi], al
    inc rsi
    inc rdi
    dec rcx
    jnz memcpy_loop
memcpy_done:
    pop rax
    ret