How to sum elementes of same position from 2 vectors assembly 32 bits

[Bru2sL2P]

[astrod333]

Here's a simple example in x86 assembly (32-bit) to sum elements from two vectors, one by one:

; Inputs:
; esi = address of vector A
; edi = address of vector B
; edx = address of result vector C
; ecx = number of elements

sum_vectors:
.loop:
    mov eax, [esi]     ; load A[i] into eax
    add eax, [edi]     ; eax = A[i] + B[i]
    mov [edx], eax     ; store result in C[i]

    add esi, 4         ; move to next A[i]
    add edi, 4         ; move to next B[i]
    add edx, 4         ; move to next C[i]
    dec ecx
    jnz .loop
    ret

This just loops through two arrays and sums each pair of 32-bit integers into a result array. Simple, readable, and works on any 32-bit x86 CPU.