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

VPMOVM2B

Moves data from a xmm register to a general-purpose register. Specifically, it extracts the lowest byte of the lowest 64-bit element of the source xmm register and stores it into the destination general-purpose register, with the upper bits of the destination register being zeroed.

The following table covers what the source and destinations can be:

DO NOT support LOCK

This instruction is only available in 64-bit mode. It cannot be used in compatibility mode.

The destination register is treated as a 64-bit register (r64); while only the lowest 8 bits are populated from the source, the remaining 56 bits are cleared to zero. Failure to account for the zero-extension of the destination register may lead to incorrect results in subsequent arithmetic operations.