SEVL -- AArch32

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SEVL -- AArch32

SEVL

Send Event Local is a hint instruction that causes an event to be signaled locally without requiring the event to be signaled to other PEs in the multiprocessor system. It can prime a wait-loop which starts with a WFE instruction.

It has encodings from the following instruction sets: A32 ( A1 ) and T32 ( T1 and T2 ) .

A1

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
!= 1111				0	0	1	1	0	0	1	0	0	0	0	0	(1)	(1)	(1)	(1)	(0)	(0)	(0)	(0)	0	0	0	0	0	1	0	1
cond									R			imm4								imm12

Encoding

SEVL{<c>}{<q>}

Decode for this encoding

// No additional decoding required

T1

15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
1	0	1	1	1	1	1	1	0	1	0	1	0	0	0	0
								hint

Encoding

SEVL{<c>}{<q>}

Decode for this encoding

// No additional decoding required

T2

15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
1	1	1	1	0	0	1	1	1	0	1	0	(1)	(1)	(1)	(1)	1	0	(0)	0	(0)	0	0	0	0	0	0	0	0	1	0	1
																								hint				option

Encoding

SEVL{<c>}.W

Decode for this encoding

// No additional decoding required

For more information about the CONSTRAINED UNPREDICTABLE behavior of this instruction, see Architectural Constraints on UNPREDICTABLE behaviors.

Assembler Symbols

<c>	See Standard assembler syntax fields.

<q>	See Standard assembler syntax fields.

Operation

if ConditionPassed() then EncodingSpecificOperations(); SendEventLocal(); end;

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