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

AAA

Adjusts the value of the accumulator after an ASCII addition operation. It checks if the lowest 4 bits of the AL register are greater than 9 or if the Auxiliary Carry Flag (AF) is set; if either condition is true, it increments AH by 1, adds 6 to AL, and sets both the AF and CF flags.

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

DO NOT support LOCK

This instruction is NOT supported in 64-bit mode. It is ONLY available in compatibility mode when executing 16-bit or 32-bit code.

The instruction exclusively operates on the AL and AH registers. Attempting to use it in a context where 64-bit registers are expected will result in an invalid operation or is simply not supported by the hardware. Users MUST ensure the code is running in a compatible mode to avoid illegal instruction exceptions.