MOVBE - x86-64 instruction reference

movbeMove data after swapping bytes 
Moves data between a register and memory, reversing the byte order as it is copied.
Atom, and Haswell and later
Intel's reference: MOVBE 
CFPFAFZFSFDFOF –––––––
Changes no flag
Forms  movbe ,  163264 
 movbe ,  163264 
Operands reg A general-purpose register matching the operation’s size, for example al, ax, eax or rax. The byte registers ah, bh, ch and dh cannot be used with a REX prefix, which is required by spl, bpl, sil, dil and r8–r15. 
mem A memory location addressed with square brackets, for example [rbx+8] or [label]. 
 global _start

section .data
value: dq 7

section .text
_start:
        mov rax, 12
        mov rbx, 5
        mov rcx, 3
        mov rsi, 9

        movbe rax, [value]

        mov rax, 60         ; syscall 60: exit
        xor rdi, rdi
        syscall