nop

No Operation (Thumb)

NOP

No op (Thumb 16-bit).

Pseudocode Operation

// No operation; pipeline advance only

Encoding

Binary Layout

10111111

15:8

0000

7:4

0000

3:0

 

Format Thumb System

Opcode 0xBF00

Extension T32 (Base)

Operands

Related

Other forms of nop

• nop No Operation
• nop No Operation (A32)

Across architectures

No Operation : how x86, ARM, RISC-V, and PowerISA each do this.

More in T32 (Base)

Reference

View in Arm A64 ISA Reference ↗ Arm AArch32 ISA

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0x0320F000	NOP{<c>}{<q>}		A32		cond | 00110 | 0 | 10 | 00 | 00 | 1 | 1 | 1 | 1 | 000000000000
0xBF00	NOP{<c>}{<q>}		T32		10111111 | 0000 | 0000
0xF3AF8000	NOP{<c>}.W		T32		111100111010 | 1 | 1 | 1 | 1 | 10 | 0 | 0 | 0 | 000 | 0000 | 0000

Description

No Operation does nothing. This instruction can be used for instruction alignment purposes.

Operation

if ConditionPassed() then
    EncodingSpecificOperations();
    // Do nothing