nop

No Operation

NOP

Does nothing. Used for padding or timing.

Details

Performs no operation and does not affect any processor state. NOP is an alias for HINT with immediate 0. No condition flags are affected. Execution state: AArch64-only.

Pseudocode Operation

# No operation performed
PC ← PC + 4

Example

NOP

Encoding

Binary Layout

11010101000000110010

0000

000

11111

Format System Alias

Opcode 0xD503201F

Extension Base

Operands

Reference (Arm A64 ISA)

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0xD503201F	NOP		A64		11010101000000110010 \| 0000 \| 000 \| 11111

Description

No Operation does nothing, other than advance the value of the program counter by 4. This instruction can be used for instruction alignment purposes.

Operation

return;    // do nothing