There is no blog post

If there was a blog post written in markdown it would be here (but there isn't one).

Instead here is some assembly code:

%include "x86inc.asm"

SECTION .text

;static void add_values(uint8_t *src, const uint8_t *src2)  
INIT_XMM sse2  
cglobal add_values, 2, 2, 2, src, src2   
    movu  m0, [srcq]  
    movu  m1, [src2q]

    paddb m0, m1

    movu  [srcq], m0

    RET
@76616c6172