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

VEXTRACTI64x2

VEXTRACTI64x2 extracts two 64-bit elements from a YMM register based on an immediate index and stores the result in a XMM register.

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

DO NOT support LOCK

This instruction requires AVX support and is available in both 64-bit mode and compatibility mode. It SHALL NOT be used in 32-bit mode unless the processor supports the corresponding AVX extensions.

The immediate index SHALL be within the range of 0 to 3. Any value outside this range will result in an invalid operation. Because this instruction transitions data from a 256-bit register to a 128-bit register, it may trigger transitions between AVX and SSE states, potentially causing performance penalties due to VZEROUPPER requirements if mixed with legacy SSE code.