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SAVEPREVSSP

Saves the current value of the RSP register into the specified destination operand.

The following table covers the supported source and destination operands.

DO NOT support LOCK

This instruction SHALL only be executed in 64-bit mode. It is NOT available in compatibility mode or 32-bit mode.

When using a memory destination (m64), the instruction SHALL perform a store operation. If the memory operand is located in a non-writable page, a page-fault exception SHALL be generated. Ensure the destination is 8-byte aligned to avoid performance degradation or alignment check exceptions if Alignment Check (AC) flag is set in EFLAGS.