RCR - x86-64 instruction reference

rcrRotate right through carry flag 
Rotates the destination right by the given count through CF; the low bit moves into CF each step.
8086 and later
Intel's reference: RCL/RCR/ROL/ROR 
CFPFAFZFSFDFOF ●–––––?
● set from the result
? undefined afterwards
– not changed
Reads CF
OF Defined only for a count of 1.
A count of 0 leaves every flag unchanged.
Forms  rcr ,  8163264 
 rcr , 1 8163264 
 rcr , cl 8163264 
Operands r/m A general-purpose register or memory location matching the operation’s size, for example rax or qword [rbp-8]. The byte registers ah, bh, ch and dh cannot be used with a REX prefix, including when the memory address uses r8–r15. 
imm8 An 8-bit immediate, -128 to 255. Instructions that sign-extend it to a wider operand interpret the byte as -128 to 127; shift counts do not use this sign extension. 
The rotation ring has 9, 17, 33 or 65 bits for an 8-, 16-, 32- or 64-bit operand. For example, rcl al, 1 moves the old high bit into CF and the old CF into bit 0. rcr rotates in the opposite direction. OF is defined only for a count of one.
The count comes from an immediate or cl. It is masked to six bits for a 64-bit operand, or five bits for smaller operands. For byte and word operands, the masked count is then reduced modulo 9 or 17. For 32- and 64-bit operands, the mask limits the count to 31 or 63; a written count of 32 or 64 respectively masks to zero.
 global _start

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

        rcr rax, 1

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