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AESDECLAST

Performs the final round of an AES decryption operation on the destination operand using the source operand as the round key.

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.

To avoid incorrect results, ensure that the source operand contains the final round key and that the destination operand contains the state encrypted by the penultimate round. This instruction omits the AESDecMixCols step, which is required for the final round of the AES decryption process.