AT -- A64

is equivalent to

and is the preferred disassembly when SysOp(op1, '0111', CRm, op2) == Sys_AT.

<at_op>

Is an AT operation name, as listed for the AT system instruction group, encoded in (op1 :: CRm :: op2):

op1	CRm	op2	<at_op>	Architectural Feature	Description
000	1000	000	S1E1R	-	For more information, see AT S1E1R.
000	1000	001	S1E1W	-	For more information, see AT S1E1W.
000	1000	010	S1E0R	-	For more information, see AT S1E0R.
000	1000	011	S1E0W	-	For more information, see AT S1E0W.
000	1001	000	S1E1RP	FEAT_PAN2	For more information, see AT S1E1RP.
000	1001	001	S1E1WP	FEAT_PAN2	For more information, see AT S1E1WP.
000	1001	010	S1E1A	FEAT_ATS1A	For more information, see AT S1E1A.
100	1000	000	S1E2R	-	For more information, see AT S1E2R.
100	1000	001	S1E2W	-	For more information, see AT S1E2W.
100	1000	100	S12E1R	-	For more information, see AT S12E1R.
100	1000	101	S12E1W	-	For more information, see AT S12E1W.
100	1000	110	S12E0R	-	For more information, see AT S12E0R.
100	1000	111	S12E0W	-	For more information, see AT S12E0W.
100	1001	010	S1E2A	FEAT_ATS1A	For more information, see AT S1E2A.
110	1000	000	S1E3R	-	For more information, see AT S1E3R.
110	1000	001	S1E3W	-	For more information, see AT S1E3W.
110	1001	010	S1E3A	FEAT_ATS1A	For more information, see AT S1E3A.

<Xt>	Is the 64-bit name of the general-purpose source register, encoded in the "Rt" field.

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

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