CSET -- A64

CSET

Conditional set

This instruction sets the destination register to 1 if the condition is TRUE, and otherwise sets it to 0.

This is an alias of CSINC. This means:

The encodings in this description are named to match the encodings of CSINC.
The description of CSINC gives the operational pseudocode, any constrained unpredictable behavior, and any operational information for this instruction.

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

Encoding for the 32-bit variant

Applies when (sf == 0)

CSET <Wd>, <invcond>

is equivalent to

CSINC <Wd>, WZR, WZR, <cond>

and is always the preferred disassembly.

Encoding for the 64-bit variant

Applies when (sf == 1)

CSET <Xd>, <invcond>

is equivalent to

CSINC <Xd>, XZR, XZR, <cond>

and is always the preferred disassembly.

Assembler Symbols

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

<invcond>

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.

Operation

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

Operational Information

The description of CSINC gives the operational information for this instruction.

2026-03_rel 2026-03-26 20:48:11

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