This content has not been validated; it was AI-generated following the x86-64 ISA Documentation generation process to maintain high quality. However, as no human has verified this data, errors may exist. If the accuracy of this data is critical, please consult the Intel SDM. The model used to generate this is gemma4:31b

KNOTB

This instruction performs a bitwise NOT operation on a byte-sized operand and stores the result in the destination.

The table after the description covers what the source and destinations can be.

DO NOT support LOCK

This instruction is only available when the processor is operating in 64-bit mode or compatibility mode.

The destination must be aligned to a 1-byte boundary. Using an immediate value as a source for this specific mnemonic is invalid and SHALL result in an encoding error.