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

MOVSQ

Copies a qword from the memory location pointed to by RSI to the memory location pointed to by RDI.

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

DO NOT support LOCK

The instruction is only available in 64-bit mode. It requires the use of the RSI and RDI registers as implicit pointers; any attempt to use other registers for the source or destination addresses is not supported.

If the Direction Flag (DF) is set, RSI and RDI are decremented after the transfer; if DF is clear, they are incremented. Failure to initialize the DF via CLD or STD may result in unintended memory access patterns. This instruction performs a memory-to-memory copy, which is not atomic.