CCMN (register)

This instruction sets the value of the condition flags to the result of the comparison of a register value and the inverse of another register value if the condition is TRUE, and an immediate value otherwise.

Decode (all encodings)

let n : integer{} = UInt(Rn); let m : integer{} = UInt(Rm); let datasize : integer{} = 32 << UInt(sf); let condition : bits(4) = cond; var flags : bits(4) = nzcv;

Assembler Symbols

<Wn>	Is the 32-bit name of the first general-purpose source register, encoded in the "Rn" field.

<Wm>	Is the 32-bit name of the second general-purpose source register, encoded in the "Rm" field.

<nzcv>

Is the flag bit specifier, an immediate in the range 0 to 15, giving the alternative state for the 4-bit NZCV condition flags, encoded in the "nzcv" field.

<cond>

Is one of the standard conditions, encoded in the standard way, and encoded in cond:

cond	<cond>
0000	EQ
0001	NE
0010	CS\|HS
0011	CC\|LO
0100	MI
0101	PL
0110	VS
0111	VC
1000	HI
1001	LS
1010	GE
1011	LT
1100	GT
1101	LE
1110	AL
1111	NV

<Xn>	Is the 64-bit name of the first general-purpose source register, encoded in the "Rn" field.

<Xm>	Is the 64-bit name of the second general-purpose source register, encoded in the "Rm" field.

Operation

if ConditionHolds(condition) then let operand1 : bits(datasize) = X{datasize}(n); let operand2 : bits(datasize) = X{datasize}(m); (-, flags) = AddWithCarry{datasize}(operand1, operand2, '0'); end; PSTATE.[N,Z,C,V] = flags;

Operational information

This instruction is a data-independent-time instruction as described in About PSTATE.DIT.

31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
sf	0	1	1	1	0	1	0	0	1	0	Rm					cond				0	0	Rn					0	nzcv
	op	S																			o2						o3

32-bit encoding

64-bit encoding

Decode (all encodings)

Assembler Symbols

Operation

Operational information