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VINSERTF64x4

Inserts four 64-bit floating-point values from a source into a destination YMM register, governed by an immediate byte that specifies the insertion index.

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

DO NOT support LOCK

This instruction is available only in 64-bit mode. It requires AVX support.

To avoid undefined behavior or crashes, ensure that the destination register is a YMM register; using XMM registers as the primary destination for this specific 4-element insertion is invalid. The immediate value MUST be 0, 1, 2, or 3 to select the target lane; any other value is an invalid opcode.