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MOV

Copies the value from the source operand to the destination operand.

The following table covers the supported source and destination operands.

DO NOT support LOCK

The instruction SHALL NOT allow both operands to be memory regions; one operand MUST be a register. In 64-bit mode, if an immediate is used as a source for a register destination, the immediate MUST be a sign-extended 32-bit value unless the MOVABS opcode is utilized for a 64-bit immediate.

When moving data into a 32-bit register (r32) in 64-bit mode, the upper 32 bits of the destination 64-bit register (r64) SHALL be zeroed. To avoid unintended data loss in the upper bits of a register, the programmer MUST use the specific register size corresponding to the intended data width. Memory accesses MUST be aligned to the operand size to avoid performance penalties or exceptions on certain processor configurations.