JGE - x86-64 instruction reference

jgeJump if greater or equal (SF == OF) 
Jumps to the target when the last comparison found greater or equal (SF equals OF).
8086 and later
Also written as: jnl
Intel's reference: Jcc 
Used in cmp and the conditional jumpsx86-64 assembly
call, ret and the System V conventionx86-64 assembly
The bigger of two numbersx86-64 assembly
Recursion: factorial and Fibonaccix86-64 assembly
 
CFPFAFZFSFDFOF –––––––
Changes no flag
Reads SF OF
Forms  jge short   
 jge   
 jge near    386 and later 
Operands imm8 A branch target, written as a label or address. NASM calculates the displacement from the end of the instruction. The displacement must fit a signed byte, -128 to 127. 
imm A branch target, written as a label or address. NASM calculates the displacement from the end of the instruction. NASM selects a short or near encoding according to the target’s reach and any size constraint. 
imm32 A branch target, written as a label or address. NASM calculates the displacement from the end of the instruction. In 64-bit mode the encoded displacement is signed 32-bit, -2147483648 to 2147483647, even though the target address is 64-bit. 
The condition reads the current flags, commonly set by cmp or test. Signed comparisons use SF and OF; unsigned comparisons use CF. The condition-code table lists the flag tests and synonymous mnemonics.
Write the target label or address, such as jne retry. NASM calculates a displacement from the end of the jump. The short form reaches −128 through 127 bytes from that point; the longer near form in 64-bit mode uses a signed 32-bit displacement (about ±2 GiB). NASM normally selects the short form when possible. short requires the short range, while strict near keeps the longer form.
Conditional jumps have no register or memory-indirect target form. To conditionally reach an arbitrary 64-bit address, branch around an indirect jmp.
 global _start

section .text
_start:
        mov rax, 12
        cmp rax, 12         ; sets the flags the condition reads
        jge taken
        mov rbx, 1          ; runs when the condition is false
        jmp done
taken:
        mov rbx, 2          ; runs when it is true
done:

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