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XRSTOR

Restores the state of the floating-point and SIMD registers from a memory-resident structure to the processor. The instruction loads the state of the registers based on the state-component bitmap provided in the structure header.

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

DO NOT support LOCK

The instruction is available in 64-bit mode and compatibility mode. The memory operand MUST be 16-byte aligned; otherwise, a general-protection exception (#GP) is generated.

To avoid unexpected behavior or crashes, ensure that the XRSTOR operation is performed with the appropriate privilege level. If the state being restored contains components that require higher privileges than the current CPL, the processor SHALL trigger a general-protection exception (#GP). Additionally, software MUST verify that the memory region provided is valid and contains a correctly formatted XSAVE area to prevent the corruption of the SIMD register state.