CNEG -- A64

Conditional Negate returns, in the destination register, the negated value of the source register if the condition is TRUE, and otherwise returns the value of the source register.

Assembler Symbols

<Wd>	Is the 32-bit name of the general-purpose destination register, encoded in the "Rd" field.

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

Is one of the standard conditions, excluding AL and NV, encoded with its least significant bit inverted, and encoded in cond:

cond	<invcond>	Description
0000	NE	Maps to <cond> EQ.
0001	EQ	Maps to <cond> NE.
0010	CC	Maps to <cond> CS.
0011	CS	Maps to <cond> CC.
0100	PL	Maps to <cond> MI.
0101	MI	Maps to <cond> PL.
0110	VC	Maps to <cond> VS.
0111	VS	Maps to <cond> VC.
1000	LS	Maps to <cond> HI.
1001	HI	Maps to <cond> LS.
1010	LT	Maps to <cond> GE.
1011	GE	Maps to <cond> LT.
1100	LE	Maps to <cond> GT.
1101	GT	Maps to <cond> LE.

<Xd>	Is the 64-bit name of the general-purpose destination register, encoded in the "Rd" field.

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

Operation

The description of CSNEG gives the operational pseudocode for this instruction.

Operational information

If PSTATE.DIT is 1:

The execution time of this instruction is independent of:
- The values of the data supplied in any of its registers.
- The values of the NZCV flags.
The response of this instruction to asynchronous exceptions does not vary based on:
- The values of the data supplied in any of its registers.
- The values of the NZCV flags.

Internal version only: aarchmrs v2024-03_relA, pseudocode v2024-03_rel, sve v2024-03_rel ; Build timestamp: 2024-03-26T09:45

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	1	0	1	1	0	1	0	1	0	0	Rm					!= 111x				0	1	Rn					Rd
	op	S														cond					o2

CNEG

32-bit (sf == 0)

64-bit (sf == 1)

Assembler Symbols

Operation

Operational information